{"id":6834,"date":"2026-10-06T08:58:00","date_gmt":"2026-10-06T08:58:00","guid":{"rendered":"https:\/\/bioprofile.com\/?p=6834"},"modified":"2026-09-30T10:42:19","modified_gmt":"2026-09-30T10:42:19","slug":"concentration-problems-causes-and-what-a-scan-measures","status":"publish","type":"post","link":"https:\/\/bioprofile.com\/en\/concentration-problems-causes-and-what-a-scan-measures\/","title":{"rendered":"Concentration problems: what poor concentration looks like, where it comes from and what a brain fog scan measures"},"content":{"rendered":"\n<article class=\"wp-block-group bp-blog is-layout-flow wp-block-group-is-layout-flow\">\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n<link rel=\"stylesheet\" href=\"https:\/\/fonts.googleapis.com\/css2?family=Poppins:wght@300;400;500;600;700&#038;display=swap\">\n<style id=\"bp-blog-design\">\n.bp-blog {\n  --bp-ink: #212527; --bp-teal: #005859; --bp-teal-deep: #006B62; --bp-emerald: #228A62;\n  --bp-green: #7CA74D; --bp-lime: #B7CB33; --bp-lime-soft: #B7CB3329; --bp-green-aa: #4F6B28;\n  --bp-beige: #EDEAE5; --bp-sand: #DBD4CB; --bp-pale-teal: #D9E6E6; --bp-white: #FFFFFF;\n  --bp-foot: #6b6b6b;\n  --bp-font: 'Poppins','Segoe UI',Arial,sans-serif;\n  --bp-fs-h1: 40px; --bp-fs-h2: 29px; --bp-fs-h3: 21px; --bp-fs-body: 17px;\n  --bp-fs-lead: 19px; --bp-fs-small: 14px; --bp-fs-foot: 13px; --bp-fs-btn: 17px;\n  --bp-lh-body: 1.75;\n  --bp-s-2: 8px; --bp-s-3: 12px; --bp-s-4: 16px; --bp-s-5: 24px; --bp-s-6: 32px;\n  --bp-s-7: 44px; --bp-s-8: 72px;\n  --bp-measure: 875px; --bp-prose: 875px; --bp-side: 40px; --bp-portrait: 132px;\n  --bp-radius-card: 20px; --bp-radius-btn: 10px; --bp-radius-chip: 999px;\n  --bp-shadow: 0 10px 30px rgba(0,88,89,0.10); --bp-shadow-soft: 0 2px 10px rgba(0,88,89,0.06);\n  font-family: var(--bp-font); font-size: var(--bp-fs-body); line-height: var(--bp-lh-body);\n  color: var(--bp-ink); background: var(--bp-white); -webkit-font-smoothing: antialiased;\n}\n.bp-blog, .bp-blog * { box-sizing: border-box; }\n.bp-blog p, .bp-blog li, .bp-blog h1, .bp-blog h2, .bp-blog h3, .bp-blog a, .bp-blog td,\n.bp-blog th, .bp-blog cite { overflow-wrap: break-word; min-width: 0; }\n.bp-blog h1, .bp-blog h2, .bp-blog h3 { text-wrap: balance; }\n.bp-blog p, .bp-blog li { text-wrap: pretty; }\n\/* WordPress core's flow layout puts 24px above every child after the first; inside\n   a grid or a flex row that is a misalignment (measured on the scan pages 2026-08-21) *\/\n.bp-blog .bp-blog-author > *, .bp-blog .bp-blog-related > *, .bp-blog .bp-blog-verify > * { margin-block: 0; }\n\n\/* --- sections: one column, the article measure, the section rhythm ------------ *\/\n.bp-blog-sec { position: relative; background: var(--bp-white); margin-block: 0;\n  padding-block: var(--bp-s-7);\n  padding-inline: max(var(--bp-side), calc((100% - var(--bp-measure)) \/ 2)); }\n.bp-blog-sec > *:last-child { margin-block-end: 0; }\n.bp-blog-sec > p, .bp-blog-sec > ul, .bp-blog-sec > ol, .bp-blog-sec > .wp-block-quote,\n.bp-blog-sec > .bp-blog-faq-item, .bp-blog-sec > .bp-blog-takeaways, .bp-blog-sec > .bp-blog-toc,\n.bp-blog-sec > .bp-blog-refs, .bp-blog-sec > .bp-blog-srclead { max-width: var(--bp-prose); }\n.bp-blog-sec--head { padding-block: var(--bp-s-7) 0; }\n.bp-blog-sec--body { padding-block: var(--bp-s-6) var(--bp-s-7); }\n.bp-blog-sec--beige { background: var(--bp-beige); }\n.bp-blog-sec--wash { background: linear-gradient(180deg, #B7CB331A 0%, #B7CB330D 100%), #FFFFFF; }\n.bp-blog-sec--tight { padding-block: var(--bp-s-6); }\n\/* A COLOURED SECTION IS A PANEL, so it carries the panel radius. Measured on the\n   live site 2026-08-28 rather than chosen: bioprofile.com's own coloured blocks\n   come in two families, full-bleed strips (w=1440 edge to edge, radius 0, 40px\n   side padding) and inset panels (the lime block w=677 and the sand block w=576,\n   both radius 16px). Ours cannot be the first: the theme's content wrapper is\n   1140px, so a coloured section here stops 150px short of the screen on both\n   sides and reads as an inset panel with square corners, which is the thing the\n   operator saw. So it takes the panel treatment. The radius is this template's\n   own --bp-radius-card (20px, shared with the scan pages) rather than the site's\n   16px, so the page carries ONE panel radius instead of a third value.\n   The small vertical margin is what lets the corners read where two coloured\n   panels stack (the CTA, the FAQ wash and the sources beige run consecutively). *\/\n.bp-blog .bp-blog-sec--beige, .bp-blog .bp-blog-sec--wash, .bp-blog .bp-blog-cta {\n  border-radius: var(--bp-radius-card); margin-block: var(--bp-s-3); }\n.bp-blog-sec--foot { padding-block: var(--bp-s-5) var(--bp-s-7); border-top: 1px solid var(--bp-sand); }\n.bp-blog .bp-blog-rule { height: 6px; border: 0; margin-block: 0; max-width: none;\n  background: linear-gradient(90deg, #005859 0%, #006B62 38%, #228A62 66%, #B7CB33 100%); }\n\n\/* --- core blocks by element ------------------------------------------------- *\/\n.bp-blog p { font-size: var(--bp-fs-body); line-height: var(--bp-lh-body); margin-block: 0 var(--bp-s-5); }\n.bp-blog h1 { font-size: var(--bp-fs-h1); font-weight: 700; line-height: 1.22; letter-spacing: -0.01em;\n  margin-block: 0 var(--bp-s-4); color: var(--bp-ink); max-width: var(--bp-measure); }\n.bp-blog h2 { font-size: var(--bp-fs-h2); font-weight: 700; line-height: 1.3; letter-spacing: -0.01em;\n  color: var(--bp-ink); margin-block: var(--bp-s-4) var(--bp-s-4); padding-block-start: var(--bp-s-4);\n  position: relative; max-width: var(--bp-prose); }\n.bp-blog h2::before { content: \"\"; position: absolute; top: 0; left: 0; width: 56px; height: 4px;\n  border-radius: 2px; background: var(--bp-lime); }\n.bp-blog h3 { font-size: var(--bp-fs-h3); font-weight: 700; line-height: 1.35; color: var(--bp-teal);\n  margin-block: var(--bp-s-2) var(--bp-s-3); max-width: var(--bp-prose); }\n.bp-blog ul, .bp-blog ol { font-size: var(--bp-fs-body); line-height: var(--bp-lh-body);\n  margin-block: 0 var(--bp-s-5); padding-left: var(--bp-s-5); }\n.bp-blog li { margin-block-end: var(--bp-s-2); }\n.bp-blog a { color: var(--bp-teal); text-decoration: underline; text-underline-offset: 2px; }\n.bp-blog a:hover { color: var(--bp-green); }\n.bp-blog strong { font-weight: 600; }\n.bp-blog .wp-block-quote { border-left: 4px solid var(--bp-lime); margin: 0 0 var(--bp-s-5);\n  padding: var(--bp-s-2) 0 var(--bp-s-2) var(--bp-s-5); font-style: normal; }\n.bp-blog .wp-block-quote p { margin-block: 0 var(--bp-s-2); }\n.bp-blog .wp-block-quote cite { font-size: var(--bp-fs-small); color: var(--bp-foot); font-style: normal; }\n.bp-blog .wp-block-table { margin: 0 0 var(--bp-s-5); overflow-x: auto; }\n.bp-blog .wp-block-table table { border-collapse: collapse; width: 100%; font-size: var(--bp-fs-small); }\n.bp-blog .wp-block-table th, .bp-blog .wp-block-table td { border: 1px solid var(--bp-sand);\n  padding: var(--bp-s-2) var(--bp-s-3); text-align: left; vertical-align: top; }\n.bp-blog .wp-block-table th { background: var(--bp-beige); font-weight: 600; }\n.bp-blog .wp-block-image { margin: 0 0 var(--bp-s-5); }\n.bp-blog .wp-block-image img { display: block; width: 100%; height: auto;\n  border-radius: var(--bp-radius-card); box-shadow: var(--bp-shadow); }\n.bp-blog .wp-block-image figcaption { font-size: var(--bp-fs-foot); line-height: 1.6; color: var(--bp-foot);\n  text-align: left; margin-block: var(--bp-s-2) 0; }\n.bp-blog .wp-block-separator { border: 0; border-top: 1px solid var(--bp-sand); margin-block: var(--bp-s-6); }\n\n\/* --- buttons: two classes so core's own rule cannot win ------------------------ *\/\n.bp-blog .wp-block-buttons { display: flex; justify-content: flex-start; margin-block: 0 var(--bp-s-3); }\n.bp-blog .wp-block-button__link { display: inline-flex; align-items: center; justify-content: center;\n  min-height: 52px; background: var(--bp-teal); color: var(--bp-white); font-size: var(--bp-fs-btn);\n  font-weight: 700; line-height: 1.2; border-radius: var(--bp-radius-btn); padding: 15px 40px;\n  text-decoration: none; transition: background 250ms ease; box-shadow: var(--bp-shadow); }\n.bp-blog .wp-block-button__link:hover { background: var(--bp-green); color: var(--bp-white); }\n\n\/* --- the head: category, title, the meta line, the picture ------------------- *\/\n.bp-blog .bp-blog-eyebrow { font-size: 15px; font-weight: 600; letter-spacing: 0.08em;\n  text-transform: uppercase; margin-block: 0 var(--bp-s-3); }\n.bp-blog .bp-blog-eyebrow a { color: var(--bp-green-aa); text-decoration: none; }\n.bp-blog .bp-blog-eyebrow a:hover { text-decoration: underline; }\n.bp-blog .bp-blog-meta { font-size: var(--bp-fs-small); line-height: 1.6; color: var(--bp-foot);\n  margin-block: 0 var(--bp-s-5); max-width: var(--bp-measure); }\n.bp-blog .bp-blog-meta a { color: var(--bp-foot); }\n\/* A text link is a thumb target of at least 44px (T332b). It stays INLINE: an\n   inline-block link that wraps turns into a two-line box and breaks the line\n   rhythm of the paragraph (measured 2026-09-17 on the introduction of the\n   bloating article: line gaps 26, 6 and 32px instead of 28). Vertical padding on\n   an inline box enlarges its hit area and leaves the line boxes alone; the\n   padding is set so that the box is 46px whatever the font size (Poppins' content\n   area is 1.4em). The reference marks carry the same box in their own rule. *\/\n.bp-blog .bp-blog-eyebrow a, .bp-blog .bp-blog-ctamicro a, .bp-blog .bp-blog-authormeta a,\n.bp-blog .bp-blog-refs a, .bp-blog .bp-blog-sec--body p > a, .bp-blog .bp-blog-faq-item p > a {\n  display: inline; padding-block: calc(23px - 0.7em); -webkit-box-decoration-break: clone;\n  box-decoration-break: clone; }\n.bp-blog .bp-blog-hero { margin: 0; max-width: var(--bp-measure); }\n.bp-blog .bp-blog-hero img { aspect-ratio: 1200 \/ 630; object-fit: cover; }\n.bp-blog .bp-blog-lead { font-size: var(--bp-fs-lead); line-height: 1.65; }\n\n\/* --- the key takeaways box, near the top --------------------------------------- *\/\n.bp-blog .bp-blog-takeaways { background: var(--bp-beige); border-radius: var(--bp-radius-card);\n  box-shadow: inset 5px 0 0 var(--bp-teal); padding: var(--bp-s-5) var(--bp-s-5) var(--bp-s-5) var(--bp-s-6);\n  margin-block: 0 var(--bp-s-6); }\n.bp-blog .bp-blog-takeaways > * { margin-block: 0; max-width: none; }\n.bp-blog .bp-blog-takeaways h2 { font-size: 15px; font-weight: 700; letter-spacing: 0.08em;\n  text-transform: uppercase; color: var(--bp-green-aa); padding-block-start: 0; margin-block: 0 var(--bp-s-3); }\n.bp-blog .bp-blog-takeaways h2::before { display: none; }\n.bp-blog .bp-blog-takeaways ul { padding-left: 20px; }\n.bp-blog .bp-blog-takeaways li { font-weight: 500; margin-block-end: var(--bp-s-2); }\n.bp-blog .bp-blog-takeaways li:last-child { margin-block-end: 0; }\n\n\/* --- the table of contents ------------------------------------------------------ *\/\n.bp-blog .bp-blog-toc { border: 1px solid var(--bp-sand); border-radius: var(--bp-radius-card);\n  padding: var(--bp-s-4) var(--bp-s-5); margin-block: 0 var(--bp-s-6); background: var(--bp-white); }\n.bp-blog .bp-blog-toc > * { margin-block: 0; max-width: none; }\n.bp-blog .bp-blog-toclabel { font-size: 13px; font-weight: 700; letter-spacing: 0.08em;\n  text-transform: uppercase; color: var(--bp-green-aa); margin-block: 0 var(--bp-s-2); }\n.bp-blog .bp-blog-toc ol { padding-left: 20px; font-size: var(--bp-fs-small); line-height: 1.6; }\n.bp-blog .bp-blog-toc li { margin-block-end: 4px; }\n.bp-blog .bp-blog-toc a { display: inline-flex; align-items: center; min-height: 44px; text-decoration: none; }\n\/* T332: the contents list is a plain group, not a <nav>: one menu per page is the\n   site's (T229), and page_rules refuses a nav of the page's own *\/\n.bp-blog .bp-blog-toc a:hover { text-decoration: underline; }\n\n\/* --- reference marks ----------------------------------------------------------- *\/\n.bp-blog .bp-blog-sup { font-size: 0.68em; line-height: 0; vertical-align: super; }\n\/* the mark's hit area is 46px high (T332b: every thumb control is 44px or more);\n   vertical padding on an inline box leaves the line boxes alone, and no side\n   padding lets neighbouring marks overlap *\/\n.bp-blog .bp-blog-sup a { text-decoration: none; font-weight: 700; color: var(--bp-teal);\n  padding: calc(23px - 0.7em) 0; }\n.bp-blog .bp-blog-sup a:hover { text-decoration: underline; }\n.bp-blog .bp-blog-sup a + a { margin-left: 1px; }\n\n\/* --- the CTA band to the scan page -------------------------------------------- *\/\n.bp-blog .bp-blog-cta { background: var(--bp-teal); color: var(--bp-white); text-align: center;\n  padding-block: var(--bp-s-8); }\n.bp-blog .bp-blog-cta > * { margin-inline: auto; }\n.bp-blog .bp-blog-cta h2 { color: var(--bp-white); margin-block-start: 0; }\n.bp-blog .bp-blog-cta h2::before { left: 50%; transform: translateX(-50%); }\n.bp-blog .bp-blog-cta > p { color: rgba(255,255,255,0.92); max-width: var(--bp-prose); }\n.bp-blog .bp-blog-cta .wp-block-buttons { justify-content: center; }\n.bp-blog .bp-blog-cta .wp-block-button__link { background: var(--bp-lime); color: var(--bp-ink);\n  box-shadow: 0 10px 30px rgba(0,0,0,0.18); }\n.bp-blog .bp-blog-cta .wp-block-button__link:hover { background: var(--bp-white); color: var(--bp-teal); }\n.bp-blog .bp-blog-ctamicro { font-size: var(--bp-fs-small); color: rgba(255,255,255,0.82) !important;\n  margin-block: 0; }\n.bp-blog .bp-blog-cta a:not(.wp-block-button__link) { color: var(--bp-lime); }\n\n\/* --- the FAQ ---------------------------------------------------------------------- *\/\n.bp-blog .bp-blog-faq-item { background: var(--bp-white); border: 1px solid var(--bp-sand);\n  border-radius: var(--bp-radius-card); padding: var(--bp-s-4) var(--bp-s-5); margin-block: 0 var(--bp-s-3);\n  box-shadow: var(--bp-shadow-soft); }\n.bp-blog .bp-blog-faq-item > * { margin-block: 0; max-width: none; }\n.bp-blog .bp-blog-faq-item h3 { margin-block: 0 var(--bp-s-2); }\n.bp-blog .bp-blog-faq-item p { font-size: 16px; }\n\n\/* --- the sources ------------------------------------------------------------------ *\/\n.bp-blog .bp-blog-srclead { font-size: var(--bp-fs-small); color: var(--bp-foot); }\n.bp-blog .bp-blog-refs { font-size: var(--bp-fs-small); line-height: 1.6; padding-left: 22px; }\n.bp-blog .bp-blog-refs li { margin-block-end: var(--bp-s-3); }\n.bp-blog .bp-blog-refs a { font-size: var(--bp-fs-foot); overflow-wrap: anywhere; }\n\n\/* --- the author card (the scan pages' card, three zones) ------------------------- *\/\n.bp-blog .bp-blog-author { display: grid;\n  grid-template-columns: var(--bp-portrait) minmax(0, 220px) minmax(0, 1fr);\n  grid-template-areas: \"photo id bio\" \"meta meta meta\"; gap: var(--bp-s-5) var(--bp-s-6);\n  align-items: start; background: var(--bp-white); border: 1px solid var(--bp-sand);\n  border-radius: var(--bp-radius-card); box-shadow: var(--bp-shadow-soft);\n  padding: var(--bp-s-5); margin-block: 0 var(--bp-s-4); max-width: none; }\n.bp-blog .bp-blog-author > .wp-block-image { grid-area: photo; margin: 0; width: var(--bp-portrait); }\n.bp-blog .bp-blog-author .wp-block-image img { aspect-ratio: 1 \/ 1; object-fit: cover;\n  object-position: 50% 12%; width: var(--bp-portrait); height: var(--bp-portrait); border-radius: 50%;\n  background: var(--bp-pale-teal); border: 2px solid var(--bp-lime); box-shadow: none; }\n.bp-blog .bp-blog-authorid { grid-area: id; }\n.bp-blog .bp-blog-authorid > * { margin-block: 0 var(--bp-s-2); max-width: none; }\n.bp-blog .bp-blog-authorbody { grid-area: bio; }\n.bp-blog .bp-blog-authorbody > * { margin-block: 0 var(--bp-s-2); max-width: none; }\n.bp-blog .bp-blog-authormeta { grid-area: meta; display: flex; flex-wrap: wrap; gap: var(--bp-s-2) var(--bp-s-5);\n  border-top: 1px solid var(--bp-sand); padding-top: var(--bp-s-3); }\n.bp-blog .bp-blog-authormeta > * { margin-block: 0; max-width: none; }\n.bp-blog .bp-blog-authorname { font-size: 20px; font-weight: 700; line-height: 1.3; color: var(--bp-ink); }\n.bp-blog .bp-blog-authorrole { font-size: 12px; font-weight: 700; letter-spacing: 0.08em;\n  text-transform: uppercase; color: var(--bp-green-aa); }\n.bp-blog .bp-blog-authorbio { font-size: var(--bp-fs-small); line-height: 1.7; }\n.bp-blog .bp-blog-dates { font-size: var(--bp-fs-foot); line-height: 1.6; color: var(--bp-foot); }\n@media (max-width: 1023px) {\n  .bp-blog .bp-blog-author { grid-template-columns: var(--bp-portrait) minmax(0, 1fr);\n    grid-template-areas: \"photo id\" \"photo bio\" \"meta meta\"; }\n}\n\n\/* --- verified by: exists only for a real, confirmed verifier ------------------- *\/\n.bp-blog .bp-blog-verify { background: var(--bp-white); border: 1px solid var(--bp-sand);\n  border-radius: var(--bp-radius-card); box-shadow: inset 5px 0 0 var(--bp-lime), var(--bp-shadow-soft);\n  padding: var(--bp-s-4) var(--bp-s-5) var(--bp-s-4) var(--bp-s-6); margin-block: 0 var(--bp-s-4); }\n.bp-blog .bp-blog-verify > * { margin-block: 0 var(--bp-s-2); max-width: none; }\n.bp-blog .bp-blog-verify-name { font-size: 18px; font-weight: 700; }\n.bp-blog .bp-blog-verify-cred { font-size: var(--bp-fs-small); color: var(--bp-foot); }\n\/* T332, Jesse 2026-09-17: a SMALL box at the top, under the introduction *\/\n.bp-blog .bp-blog-verify--top { display: grid; grid-template-columns: 56px 1fr; column-gap: 14px;\n  align-items: center; padding: 12px 16px; margin-block: var(--bp-s-3); max-width: var(--bp-prose); }\n.bp-blog .bp-blog-verify--top > * { margin: 0; }\n.bp-blog .bp-blog-verify--top .wp-block-image { grid-row: span 3; 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It is not a diagnosis.<\/li>\n\n<\/ul>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-toc is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"bp-blog-toclabel wp-block-paragraph\">Contents<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n\n<li><a href=\"#hoe-slecht-concentreren-eruitziet\">What poor concentration looks like<\/a><\/li>\n\n\n<li><a href=\"#oorzaken-concentratieproblemen-wat-er-gemeten-is\">Causes of concentration problems: what has been measured<\/a><\/li>\n\n\n<li><a href=\"#concentratieproblemen-bij-huiswerk-schermen-en-twee-dingen-tegelijk\">Concentration problems with homework, screens and two things at once<\/a><\/li>\n\n\n<li><a href=\"#wat-je-kunt-doen\">What you can do<\/a><\/li>\n\n\n<li><a href=\"#wat-een-hersenmistscan-meet-en-wat-de-scan-niet-meet\">What a brain fog scan measures, and what the scan does not measure<\/a><\/li>\n\n\n<li><a href=\"#samengevat\">In summary<\/a><\/li>\n\n\n<li><a href=\"#veelgestelde-vragen\">Frequently asked questions<\/a><\/li>\n\n<\/ol>\n\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"hoe-slecht-concentreren-eruitziet\">What poor concentration looks like<\/h2>\n\n\n\n<p class=\"bp-blog-lead wp-block-paragraph\">In this article you will read how concentration problems feel from the inside, which causes have really been measured, which options have been tested, and what a scan can and cannot show you. That matters, because these complaints are common and rising: in the first quarter of 2023, adults aged 25 and over went to the GP with memory and concentration problems 24% more often than in the same quarter of 2020, a figure from the seventh quarterly study by Netwerk GOR that rests on the GP registrations of Nivel Zorgregistraties Eerste Lijn.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup> <a href=\"https:\/\/bioprofile.com\/en\/brain-fog-test\/\">The brain fog scan from BioProfile<\/a> measures how much of these complaints you notice, and gives you an indication of where you stand today in this area, as one of the 11 health areas the full scan assesses. This is not a diagnosis. It is self-insight, to see where you stand today, and to help you make better choices in your food and your daily life. What this scan does not do: point to a cause or name a condition. Only a doctor can do that.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In measurements, concentration problems first show up as lapses, the brief moments when attention simply drops away. A meta-analysis pooled 70 articles with 147 datasets, every participant an adult of 18 or over and the total sleep loss never more than 48 hours. Of six cognitive categories, lapses in simple attention showed the largest effect of short sleep loss: Hedges g = -0.776, 95% CI [-0.96, -0.60], p &lt; .001. The accuracy of reasoning showed the smallest effect and was not significant: g = -0.125, 95% CI [-0.27, 0.02].\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">2<\/a><\/sup> In plain words: thinking a problem through slowly holds up reasonably well, and what gives way is the dull, continuous attention that a page of homework, a meeting or a drive home asks of you. That is the familiar description, that your head still works but nothing stays in it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"oorzaken-concentratieproblemen-wat-er-gemeten-is\">Causes of concentration problems: what has been measured<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Stress is the second measured cause. Out of a final sample of 51 studies with 2,486 participants and 223 effect sizes, all without a known mental or psychiatric disorder and tested in a single laboratory session, 34 studies with 1,353 participants and 164 effect sizes were about working memory. A single moment of acute stress lowered performance there: g+ = -0.197, 95% CI [-0.330, -0.064], p = .005. The drop was larger when the task load was high (g+ = -0.303, p = .005) than when the load was not high (g+ = -0.049, p = .404).\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">3<\/a><\/sup> What that means on a working day: a stressful morning does not flatten your whole head, but it takes the hardest work off your desk while the easy parts still run.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Water is the cause you can change within an hour. In a randomised controlled trial, 76 young adults aged 18 to 23 went 24 hours without water, and the score on the portrait memory test fell from 34 points at baseline to 27 points, p &lt; 0.001. After water was given again, the groups that drank 1000 mL and 500 mL scored higher on the operation span test of working memory, p = 0.009 and p = 0.005.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">4<\/a><\/sup> So a day of drinking too little is not a small thing for your attention.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thuisarts also names the causes of memory complaints that belong on your own list first: stress and major life events, certain medicines such as sleeping pills and medicines for the bladder or the prostate, alcohol and drugs.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">5<\/a><\/sup><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"concentratieproblemen-bij-huiswerk-schermen-en-twee-dingen-tegelijk\">Concentration problems with homework, screens and two things at once<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The idea that heavy media use wears down your attention is weaker than it sounds. Two replication studies among students, one at Universitas Gadjah Mada and one at the Rijksuniversiteit Groningen, ran 14 tests with an average replication power of 0.81, and only 5 of those 14 gave a statistically significant effect in students with higher scores for media multitasking. A meta-analysis across 39 effect sizes from all studies published up to 2017 found a weak but significant link between media multitasking and distractibility, and that link became non-significant after correcting for small-study effects.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">6<\/a><\/sup> So it has not been shown that a phone next to your homework permanently wears down your attention. What a phone does do is split the hour you sit there, and the advice that has held up is simpler: do one task at a time, and write things down in a diary or planner.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">5<\/a><\/sup><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"wat-je-kunt-doen\">What you can do<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Exercise has the clearest effect in the short term. One Bayesian model pooled 651 effect sizes from 113 studies, together 4,390 participants aged 18 to 45, on single bouts of exercise. The benefit for cognition was small: Hedges g = 0.13 plus or minus 0.04, BF = 3.67. Reaction time on cognitive tasks was shorter after one bout of exercise (g = 0.27, HDI [0.18, 0.36]), while accuracy did not change (g = 0.04).\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">7<\/a><\/sup> Read that as speed rather than correctness: a walk makes you faster at the task in front of you. Across the week, the Dutch physical activity guideline of 22 August 2017 asks adults for at least two and a half hours of exercise at moderate intensity, to keep moving more and sit still less, and names muscle and bone strengthening activities as recommended.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">8<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Caffeine does something small and limited. In a randomised, placebo controlled, double blind crossover test at home, 53 adults with a mean age of 36 years, standard deviation 14 years, completed all four sessions. One dose of 85 mg shortened reaction time on the Go-No Go attention test by about 10 ms, P = .02, while accuracy did not change, and the same dose gave no significant effect on reaction time in the coding and n-back tests.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">9<\/a><\/sup> For scale: a 125 ml cup of filter coffee contains about 60 mg of caffeine, a 125 ml cup of black tea about 30 mg, a 250 ml can of energy drink about 80 mg, the advice for adults is no more than 400 mg a day, and in people who are sensitive to caffeine 100 mg at once can affect sleep duration and sleep pattern, certainly a few hours or less before bedtime.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">10<\/a><\/sup> In short, one coffee earns you milliseconds on a simple task, and a late coffee can cost you the night your attention leans on.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"wat-een-hersenmistscan-meet-en-wat-de-scan-niet-meet\">What a brain fog scan measures, and what the scan does not measure<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The scan asks a short set of questions about the past two weeks: how clear your head feels, how often you lose the thread, how much effort sustained attention takes. The answers are given points, the points are added up and converted into a score from 0 to 100, with the reading band the score falls into. Higher is better. What you get is a picture of how much of this you are carrying, and a baseline you can repeat in two weeks.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A questionnaire cannot attribute that picture to anything. Short sleep, one hard week, a medicine on your list, alcohol, a day of drinking too little: in a set of questions they all read the same.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">5<\/a><\/sup> It is not a diagnosis. Blood values, a look at your medicines and sleep data are the layers that take a picture of complaints to an explained picture, and you ask a doctor for those. Where a foggy head comes from in the wider sense is covered in <a href=\"https:\/\/bioprofile.com\/en\/brain-fog-what-it-is-and-where-it-comes-from\/\">brain fog: what it is and where it comes from<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thuisarts names the moments to call your GP on a working day: the feeling that your memory is getting worse quickly, complaints that get in the way of the ordinary things in your day, complaints that keep getting worse and are no longer as they were, and the feeling that you have more trouble with your memory than other people do.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">5<\/a><\/sup><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"samengevat\">In summary<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Concentration problems are among the complaints Dutch adults take to the GP more often than a few years ago. What drops out first is simple sustained attention, not slow reasoning, and the measured causes of concentration problems are close to home: short nights, a moment of acute stress during a demanding task, a day without water, medicines, alcohol. The tested options are modest and real: one bout of exercise and a week&#8217;s worth of it, caffeine early and in a known dose, one task at a time with the rest written down. A scan gives you a number for how much you are carrying today and a second number two weeks later. Naming what sits behind it remains work for a doctor.<\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-sec bp-blog-cta is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\">Measure where you start<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A short set of questions about the past two weeks, about three minutes, and your brain score is in your dashboard. What the brain fog scan measures and what the scan rests on is on the scan page.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/bioprofile.com\/en\/brain-fog-test\/\">Start the brain fog scan<\/a><\/div>\n\n<\/div>\n\n\n\n<p class=\"bp-blog-ctamicro wp-block-paragraph\">Free, about 3 minutes. An analysis of your answers, never a diagnosis. <a href=\"https:\/\/bioprofile.com\/en\/free-health-check-tests\/\">All health scans<\/a><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-sec bp-blog-sec--wash is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\" id=\"veelgestelde-vragen\">Frequently asked questions<\/h2>\n\n\n\n<div class=\"wp-block-group bp-blog-faq-item is-layout-flow wp-block-group-is-layout-flow\">\n\n<h3 class=\"wp-block-heading\">What are the symptoms of poor concentration?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In measurements the first sign is lapses: brief moments when simple attention drops away. Of six cognitive categories in a meta-analysis of 70 articles with 147 datasets, lapses in simple attention showed the largest effect of short sleep loss (Hedges g = -0.776), while the accuracy of reasoning showed the smallest effect and was not significant.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">2<\/a><\/sup> Thuisarts describes the complaints that matter as the complaints that get in the way of the ordinary things of a day.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">5<\/a><\/sup><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-faq-item is-layout-flow wp-block-group-is-layout-flow\">\n\n<h3 class=\"wp-block-heading\">What are the symptoms of a concentration disorder?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Whether a set of complaints belongs to a disorder is for a doctor to judge. What you can describe yourself is what Thuisarts names as a reason to call: the feeling that your memory is getting worse quickly, complaints that get in the way of the ordinary things of a day, complaints that keep getting worse and are no longer as they were, and the feeling of having more trouble with your memory than other people.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">5<\/a><\/sup><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-faq-item is-layout-flow wp-block-group-is-layout-flow\">\n\n<h3 class=\"wp-block-heading\">What are the causes of concentration problems?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The measured causes are close to home: short sleep,\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">2<\/a><\/sup> one moment of acute stress during a demanding task,\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">3<\/a><\/sup> and a day without water, which brought the score on the portrait memory test from 34 to 27 points in 76 young adults.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">4<\/a><\/sup> Thuisarts also names stress and major life events, certain medicines such as sleeping pills and medicines for the bladder or the prostate, alcohol and drugs.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">5<\/a><\/sup><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-faq-item is-layout-flow wp-block-group-is-layout-flow\">\n\n<h3 class=\"wp-block-heading\">What can you do about concentration problems?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A single bout of exercise gave a small benefit for cognition in 4,390 participants aged 18 to 45, mostly as a shorter reaction time.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">7<\/a><\/sup> The Dutch physical activity guideline asks adults for at least two and a half hours a week at moderate intensity.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">8<\/a><\/sup> Thuisarts advises writing things down in a diary or planner, doing one task at a time, and staying active through exercise and social contact.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">5<\/a><\/sup><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-faq-item is-layout-flow wp-block-group-is-layout-flow\">\n\n<h3 class=\"wp-block-heading\">Does coffee help with concentration?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A little, and very limited. In 53 adults at home, 85 mg of caffeine shortened reaction time on a Go-No Go attention test by about 10 ms, with no effect on the coding and n-back tests.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">9<\/a><\/sup> A 125 ml cup of filter coffee contains about 60 mg, the advice for adults is no more than 400 mg a day, and in sensitive people 100 mg shortly before sleep can affect sleep duration and sleep pattern.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">10<\/a><\/sup><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-faq-item is-layout-flow wp-block-group-is-layout-flow\">\n\n<h3 class=\"wp-block-heading\">Is the brain fog scan a concentration test?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The scan measures how much trouble with concentration and brain fog you are carrying over the past two weeks and gives you a baseline. Looking for a cause is work for a doctor, and the scan is not a diagnosis.<\/p>\n\n<\/div>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-sec bp-blog-sec--beige bp-blog-sec--tight is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\" id=\"bronnen\">Sources<\/h2>\n\n\n\n<p class=\"bp-blog-srclead wp-block-paragraph\">Every source below was checked on the day this article was published. The numbering follows the text.<\/p>\n\n\n\n<ol class=\"wp-block-list bp-blog-refs\">\n\n<li>RIVM. Sharp rise in memory and concentration problems among adults. News item, 31 May 2023. <a href=\"https:\/\/www.rivm.nl\/nieuws\/flinke-toename-van-geheugen-en-concentratieproblemen-bij-volwassenen\">rivm.nl<\/a><\/li>\n\n\n<li>Lim J, Dinges DF. A Meta-Analysis of the Impact of Short-Term Sleep Deprivation on Cognitive Variables. Psychological Bulletin, 2010, 136(3), 375-389. <a href=\"https:\/\/doi.org\/10.1037\/a0018883\">doi.org\/10.1037\/a0018883<\/a><\/li>\n\n\n<li>Shields GS, Sazma MA, Yonelinas AP. The Effects of Acute Stress on Core Executive Functions: A Meta-Analysis and Comparison with Cortisol. Neuroscience and Biobehavioral Reviews, 2016, 68, 651-668. <a href=\"https:\/\/doi.org\/10.1016\/j.neubiorev.2016.06.038\">doi.org\/10.1016\/j.neubiorev.2016.06.038<\/a><\/li>\n\n\n<li>Zhang J, Ma G, Du S, Liu S, Zhang N. Effects of Water Restriction and Supplementation on Cognitive Performances and Mood among Young Adults in Baoding, China: A Randomized Controlled Trial (RCT). Nutrients, 2021, 13(10), 3645. <a href=\"https:\/\/doi.org\/10.3390\/nu13103645\">doi.org\/10.3390\/nu13103645<\/a><\/li>\n\n\n<li>Thuisarts.nl (NHG). I forget things quickly. <a href=\"https:\/\/www.thuisarts.nl\/snel-dingen-vergeten\/ik-vergeet-snel-dingen\">thuisarts.nl<\/a><\/li>\n\n\n<li>Wiradhany W, Nieuwenstein MR. Cognitive control in media multitaskers: Two replication studies and a meta-analysis. Attention, Perception, and Psychophysics, 2017, 79(8), 2620-2641. <a href=\"https:\/\/doi.org\/10.3758\/s13414-017-1408-4\">doi.org\/10.3758\/s13414-017-1408-4<\/a><\/li>\n\n\n<li>Garrett J, Chak C, Bullock T, Giesbrecht B. A systematic review and Bayesian meta-analysis provide evidence for an effect of acute physical activity on cognition in young adults. Communications Psychology, 2024, 2, 82. <a href=\"https:\/\/doi.org\/10.1038\/s44271-024-00124-2\">doi.org\/10.1038\/s44271-024-00124-2<\/a><\/li>\n\n\n<li>Gezondheidsraad. Beweegrichtlijnen 2017. Advice, 22 August 2017. <a href=\"https:\/\/www.gezondheidsraad.nl\/documenten\/2017\/08\/22\/beweegrichtlijnen-2017\">gezondheidsraad.nl<\/a><\/li>\n\n\n<li>Pasman WJ, Boessen R, Donner Y, Clabbers N, Boorsma A. Effect of Caffeine on Attention and Alertness Measured in a Home-Setting, Using Web-Based Cognition Tests. JMIR Research Protocols, 2017, 6(9), e169. <a href=\"https:\/\/doi.org\/10.2196\/resprot.6727\">doi.org\/10.2196\/resprot.6727<\/a><\/li>\n\n\n<li>Voedingscentrum. Caffeine. Encyclopedia. <a href=\"https:\/\/www.voedingscentrum.nl\/encyclopedie\/cafeine.aspx\">voedingscentrum.nl<\/a><\/li>\n\n<\/ol>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-sec bp-blog-sec--tight is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\">Also read<\/h2>\n\n\n\n<div class=\"wp-block-group bp-blog-related is-layout-flow wp-block-group-is-layout-flow\">\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/bioprofile.com\/en\/forgetfulness-causes-and-what-a-scan-measures\/\">Forgetfulness: where the complaint comes from, what the studies measured and when to contact your GP<\/a><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/bioprofile.com\/en\/brain-fog-what-it-is-and-where-it-comes-from\/\">Brain fog: what it is, where it comes from and what a brain scan does and does not measure<\/a><\/p>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-sec bp-blog-sec--tight is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\">Written by<\/h2>\n\n\n\n<div class=\"wp-block-group bp-blog-author is-layout-flow wp-block-group-is-layout-flow\">\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"320\" height=\"320\" src=\"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/07\/author-jesse-round-320.jpg\" alt=\"Jesse van der Velde\" class=\"wp-image-4815\" srcset=\"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/07\/author-jesse-round-320.jpg 320w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/07\/author-jesse-round-320-300x300.jpg 300w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/07\/author-jesse-round-320-150x150.jpg 150w\" sizes=\"(max-width: 320px) 100vw, 320px\" \/><\/figure>\n\n\n\n<div class=\"wp-block-group bp-blog-authorid is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"bp-blog-authorrole wp-block-paragraph\">Founder of BioProfile<\/p>\n\n\n\n<p class=\"bp-blog-authorname wp-block-paragraph\">Jesse van der Velde<\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-authorbody is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"bp-blog-authorbio wp-block-paragraph\">Jesse van der Velde has been guiding people to a new body and optimal health since 2006, and has written or co-written fifteen books on nutrition and health. Forever Young (2012) and Superfood Recipes (2013) both reached number 1 in the Netherlands.<\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-authormeta is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"bp-blog-authorbio wp-block-paragraph\"><a href=\"https:\/\/nl.linkedin.com\/in\/jessevdv\">LinkedIn<\/a><\/p>\n\n\n\n<p class=\"bp-blog-dates wp-block-paragraph\">Published on 6 October 2026 \u00b7 Last updated on 6 October 2026<\/p>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-sec bp-blog-sec--foot is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"bp-blog-legal wp-block-paragraph\">BioProfile analyses your health status to guide you and your coach. It does not make a diagnosis, only a doctor can do that. Built on validated health questionnaires; the combined BioProfile score is not itself a validated clinical instrument yet. Your answers stay private (GDPR).<\/p>\n\n<\/div>\n\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>Concentration problems: what poor concentration looks like, which causes have been measured, what a brain fog scan shows and when to call your GP.<\/p>\n","protected":false},"author":18,"featured_media":6269,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_meta-robots-noindex":"2","_yoast_wpseo_opengraph-image":"","_yoast_wpseo_opengraph-image-id":"","_yoast_wpseo_twitter-image":"","_yoast_wpseo_twitter-image-id":"","inline_featured_image":false,"footnotes":""},"categories":[69],"tags":[],"class_list":["post-6834","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-brain-health-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Concentration problems: causes and what a 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