{"id":7865,"date":"2026-07-30T11:01:15","date_gmt":"2026-07-30T11:01:15","guid":{"rendered":"https:\/\/zgbm2hfdgl-staging.onrocket.site\/?page_id=7865"},"modified":"2026-07-30T11:01:15","modified_gmt":"2026-07-30T11:01:15","slug":"eiwit-calculator-40plus","status":"publish","type":"page","link":"https:\/\/celluviva.com\/nl\/tools\/eiwit-calculator-40plus\/","title":{"rendered":"Eiwitbehoefte-calculator 40+"},"content":{"rendered":"<p><script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Eiwitbehoefte-calculator 40+\",\"applicationCategory\":\"HealthApplication\",\"operatingSystem\":\"Web\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"publisher\":{\"@type\":\"Organization\",\"name\":\"Celluviva\",\"url\":\"https:\/\/celluviva.nl\"},\"description\":\"Educatieve calculator voor dagelijkse eiwitbehoefte vanaf 40 jaar, gericht op spierbehoud en healthspan, op basis van internationale voedings- 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b.cl{display:block;font-size:11.5px;letter-spacing:1.4px;text-transform:uppercase;margin-bottom:5px;color:var(--brand-deep);}\ntable{width:100%;border-collapse:collapse;font-size:14.5px;margin:10px 0 4px;}\nth{text-align:left;font-size:11.5px;text-transform:uppercase;letter-spacing:.8px;color:var(--muted);border-bottom:2px solid var(--brand);padding:8px;}\ntd{padding:8px;border-bottom:1px solid var(--line);}\ntbody tr:nth-child(even) td{background:var(--bg);}\ntd.num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap;font-weight:600;color:var(--brand-deep);}\n.actions{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0 6px;}\n.btn2{background:#fff;color:var(--brand-deep);border:1.5px solid var(--brand);border-radius:var(--radius);padding:12px 22px;font-size:15px;font-weight:600;cursor:pointer;transition:all .15s;}\n.btn2:hover{background:var(--brand);color:#fff;}\n.disclaimer{font-size:13px;color:var(--muted);border-top:1px solid 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.no-print,.tool-form,details.methode,#capture,.lede,.kicker{display:none !important;}\n  #result{display:block !important;}\n  .card{border:none;box-shadow:none;padding:8px 0;}\n  .result-hero{background:#fff;color:var(--brand-deep);border:2px solid var(--brand);}\n  .print-only{display:block !important;}\n}\n.print-only{display:none;font-size:12.5px;color:var(--muted);margin-top:14px;}\n<\/style>\n<div class=\"tool-embed\">\n<div class=\"tool\">\n<div class=\"kicker\">Celluviva \u00b7 Gratis tool<\/div>\n<h1>Eiwitbehoefte-calculator 40+<\/h1>\n<p class=\"lede\">Vanaf je veertigste verlies je geleidelijk spiermassa (sarcopenie) \u2014 en spierweefsel reageert dan minder sterk op eiwit. Voldoende eiwit \u00e9n krachtprikkels zijn de best onderbouwde manieren om spier, kracht en zelfstandigheid op de lange termijn te behouden. Bereken je persoonlijke richtwaarde.<\/p>\n<div class=\"card tool-form\" id=\"form\">\n<h2><span class=\"n\">1<\/span>Jouw gegevens<\/h2>\n<div class=\"grid2\">\n<div class=\"field\"><label for=\"weight\">Gewicht <span class=\"hint\">(kg)<\/span><\/label><input type=\"number\" id=\"weight\" min=\"40\" max=\"200\" step=\"0.5\" placeholder=\"bv. 74\"><\/div>\n<div class=\"field\"><label for=\"height\">Lengte <span class=\"hint\">(cm)<\/span><\/label><input type=\"number\" id=\"height\" min=\"130\" max=\"220\" step=\"1\" placeholder=\"bv. 176\"><\/div>\n<div class=\"field\"><label for=\"age\">Leeftijd <span class=\"hint\">(jaren)<\/span><\/label><input type=\"number\" id=\"age\" min=\"40\" max=\"99\" step=\"1\" placeholder=\"bv. 54\"><\/div>\n<\/p><\/div>\n<div style=\"height:16px\"><\/div>\n<div class=\"field\"><label>Doe je krachttraining?<\/label><\/p>\n<div class=\"opts\">\n        <label><input type=\"radio\" name=\"strength\" value=\"0\" checked> Nee (nog) niet<\/label><br \/>\n        <label><input type=\"radio\" name=\"strength\" value=\"1\"> 1\u00d7 per week<\/label><br \/>\n        <label><input type=\"radio\" name=\"strength\" value=\"2\"> 2\u00d7 of vaker per week<\/label>\n      <\/div>\n<\/p><\/div>\n<div class=\"field\"><label>Wat is je hoofddoel?<\/label><\/p>\n<div class=\"opts\">\n        <label><input type=\"radio\" name=\"goal\" value=\"maintain\" checked> Spier behouden \/ gezond ouder worden<\/label><br \/>\n        <label><input type=\"radio\" name=\"goal\" value=\"build\"> Spier opbouwen<\/label><br \/>\n        <label><input type=\"radio\" name=\"goal\" value=\"loss\"> Afvallen m\u00e9t spierbehoud<\/label>\n      <\/div>\n<\/p><\/div>\n<p>    <button class=\"cta\" onclick=\"calc()\">Bereken mijn eiwit-richtwaarde<\/button><\/p>\n<div class=\"formerr\" id=\"formerr\">Vul gewicht, lengte en leeftijd in om te kunnen rekenen.<\/div>\n<\/p><\/div>\n<div id=\"result\">\n<div class=\"result-hero\">\n<div class=\"cap\">Jouw eiwit-richtwaarde<\/div>\n<div class=\"range\" id=\"rRange\">\u2014<\/div>\n<div class=\"unit\">gram eiwit per dag, verdeeld over de dag<\/div>\n<\/p><\/div>\n<div class=\"card\">\n<div class=\"split\">\n<div class=\"mini\"><b id=\"rPerMeal\">\u2014<\/b><span id=\"rPerMealLabel\">per eetmoment<\/span><\/div>\n<div class=\"mini\"><b id=\"rPerKg\">\u2014<\/b><span>gram per kg (rekengewicht)<\/span><\/div>\n<\/p><\/div>\n<div class=\"callout insight\" id=\"rNoteWeight\" style=\"display:none\"><b class=\"cl\">Toelichting berekening<\/b>Omdat je BMI boven de 30 ligt, rekent deze tool met een <b>gecorrigeerd rekengewicht<\/b> in plaats van je volledige lichaamsgewicht, zodat de uitkomst realistisch blijft. De formule staat onderaan.<\/div>\n<div class=\"callout insight\" id=\"rNoteAge\" style=\"display:none\"><b class=\"cl\">Vanaf 65 jaar<\/b>Spierweefsel reageert dan minder sterk op eiwit (anabole resistentie). Voldoende eiwit <b>per eetmoment<\/b> \u2014 liever 30-40 g dan 20 g \u2014 weegt extra zwaar, samen met krachtprikkels.<\/div>\n<div class=\"callout takeaway\" id=\"rNoteStrength\"><b class=\"cl\">Praktische conclusie<\/b><span id=\"rNoteStrengthText\"><\/span><\/div>\n<h3>Hoe kom je aan die grammen? (voorbeeldporties)<\/h3>\n<table>\n<thead>\n<tr>\n<th>Product<\/th>\n<th class=\"num\">Portie<\/th>\n<th class=\"num\">\u00b1 eiwit<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Magere kwark<\/td>\n<td class=\"num\">250 g<\/td>\n<td class=\"num\">27 g<\/td>\n<\/tr>\n<tr>\n<td>Skyr<\/td>\n<td class=\"num\">150 g<\/td>\n<td class=\"num\">16 g<\/td>\n<\/tr>\n<tr>\n<td>Kip- of kalkoenfilet (bereid)<\/td>\n<td class=\"num\">100 g<\/td>\n<td class=\"num\">27 g<\/td>\n<\/tr>\n<tr>\n<td>Vis (zalm, kabeljauw)<\/td>\n<td class=\"num\">100 g<\/td>\n<td class=\"num\">21 g<\/td>\n<\/tr>\n<tr>\n<td>Eieren<\/td>\n<td class=\"num\">2 stuks<\/td>\n<td class=\"num\">13 g<\/td>\n<\/tr>\n<tr>\n<td>Tofu \/ tempeh<\/td>\n<td class=\"num\">100 g<\/td>\n<td class=\"num\">12-18 g<\/td>\n<\/tr>\n<tr>\n<td>Peulvruchten (gekookt)<\/td>\n<td class=\"num\">150 g<\/td>\n<td class=\"num\">12 g<\/td>\n<\/tr>\n<tr>\n<td>Griekse yoghurt 0%<\/td>\n<td class=\"num\">200 g<\/td>\n<td class=\"num\">18 g<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"font-size:13.5px;color:var(--muted)\">Combineer dierlijke en plantaardige bronnen. Volledig plantaardig kan ook \u2014 reken dan iets ruimer vanwege de lagere verteerbaarheid, en varieer je bronnen.<\/p>\n<div class=\"actions no-print\">\n        <button class=\"btn2\" onclick=\"window.print()\">\ud83d\udcc4 Bewaar als PDF \/ print<\/button><br \/>\n        <button class=\"btn2\" onclick=\"location.reload()\">\u21ba Opnieuw berekenen<\/button>\n      <\/div>\n<div id=\"capture\">\n<h3>Sterk ouder worden?<\/h3>\n<p style=\"font-size:14.5px\">Ontvang de gratis 5-delige e-mailserie <b>&#8220;Spier als levensverzekering&#8221;<\/b> \u2014 waarom spiermassa d\u00e9 onderschatte healthspan-factor is, hoeveel eiwit \u00e9n krachttraining echt nodig zijn, en hoe je klein begint. Wetenschap zonder hype.<\/p>\n<form id=\"captureForm\" method=\"post\" target=\"_blank\">\n          <input type=\"email\" name=\"email\" placeholder=\"je e-mailadres\" required><br \/>\n          <button class=\"cta\" type=\"submit\">Stuur mij de serie<\/button><br \/>\n        <\/form>\n<div class=\"privacy\">Je gegevens worden <b>niet<\/b> meegestuurd of opgeslagen \u2014 alleen je e-mailadres, met dubbele bevestiging.<\/div>\n<\/p><\/div>\n<div class=\"print-only\" id=\"printMeta\"><\/div>\n<div class=\"disclaimer\">\n        <b>Belangrijk.<\/b> Deze calculator is een educatief hulpmiddel en geen persoonlijk voedings- of medisch advies. Heb je een nieraandoening, dan geldt vaak juist een <b>beperkte<\/b> eiwitinname \u2014 overleg in dat geval altijd eerst met je arts of di\u00ebtist voordat je je eiwit verhoogt. Ook bij leveraandoeningen of andere chronische ziekten: eerst overleggen.\n      <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<details class=\"methode\">\n<summary>Hoe deze calculator rekent (methodiek &amp; bronnen)<\/summary>\n<div class=\"methode-body\">\n<ol>\n<li><b>Rekengewicht.<\/b> BMI tot 30 = werkelijk gewicht. Boven BMI 30 = gecorrigeerd gewicht (gewicht bij BMI 25 plus 40% van het verschil), om overschatting door vetmassa te voorkomen.<\/li>\n<li><b>Bandbreedte.<\/b> Voor volwassenen 40+ met behoud van spiermassa als doel wordt in de literatuur 1,2-1,6 g eiwit per kg per dag geassocieerd met beter spierbehoud dan de basisaanbeveling van 0,8 g\/kg. Bij &#8220;opbouwen&#8221; of &#8220;afvallen met spierbehoud&#8221; en bij krachttraining \u22652\u00d7\/week schuift de bovengrens naar 1,6-1,8 g\/kg.<\/li>\n<li><b>Verdeling.<\/b> De spieropbouw-prikkel per maaltijd vlakt af boven \u00b1 25-40 g eiwit (hoger bij ouderen). Daarom verdelen we over 3-4 eetmomenten met een stevige ondergrens per moment.<\/li>\n<li><b>Leeftijd.<\/b> Vanaf 65 jaar benadrukt de tool de eiwit-per-maaltijd-ondergrens (PROT-AGE-consensus).<\/li>\n<\/ol>\n<p><b>Bronnen:<\/b><\/p>\n<ol class=\"sources\">\n<li>Bauer J, et al. PROT-AGE Study Group. J Am Med Dir Assoc. 2013;14(8):542-59.<\/li>\n<li>Deutz NEP, et al. Protein intake and exercise for optimal muscle function with aging (ESPEN). Clin Nutr. 2014;33(6):929-36.<\/li>\n<li>Morton RW, et al. Systematic review, protein supplementation and resistance training. Br J Sports Med. 2018;52(6):376-84.<\/li>\n<li>Moore DR, et al. Protein requirements for myofibrillar synthesis, older vs younger. J Gerontol A. 2015;70(1):57-62.<\/li>\n<li>Gezondheidsraad. Voedingsnormen voor eiwitten. Den Haag; 2021.<\/li>\n<\/ol>\n<p style=\"margin-top:10px\">Laatst bijgewerkt: juli 2026 \u00b7 Celluviva-redactie (research-synthese; geen medisch advies).<\/p>\n<\/p><\/div>\n<\/details>\n<div style=\"margin-top:34px;padding-top:16px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;\" class=\"no-print\">\n    <span style=\"font-family:var(--serif);font-weight:700;font-size:17px;color:var(--brand-deep);\">Celluviva<\/span><br \/>\n    <span style=\"font-size:12.5px;color:var(--muted);\">Science-led gezondheid \u00b7 celluviva.nl<\/span>\n  <\/div>\n<\/div>\n<p><script>\n\/* CONFIG \u2014 merk- en inhoudsspecifiek (skeleton-principe).\n   Deze tool deelt de rekenkern met de Recalora eiwit-calculator (cross-brand skeleton). *\/\nconst CONFIG = {\n  brand:'celluviva', newsletterAction:'',\n  gPerKgMin:1.2, gPerKgMax:1.6, gPerKgMaxStrength:1.8, gPerKgMaxLoss:1.8,\n  bmiAdjustThreshold:30, adjustFactor:0.4, mealTarget:[25,40],\n};\nfunction calc(){\n  const w=parseFloat(document.getElementById('weight').value);\n  const h=parseFloat(document.getElementById('height').value)\/100;\n  const age=parseInt(document.getElementById('age').value,10);\n  const strength=document.querySelector('input[name=strength]:checked').value;\n  const goal=document.querySelector('input[name=goal]:checked').value;\n  const err=document.getElementById('formerr');\n  if(!w||!h||!age){ err.style.display='block'; return; }\n  err.style.display='none';\n  const bmi=w\/(h*h); let cw=w, adjusted=false;\n  if(bmi>CONFIG.bmiAdjustThreshold){ const ibw=25*h*h; cw=ibw+CONFIG.adjustFactor*(w-ibw); adjusted=true; }\n  let max=CONFIG.gPerKgMax;\n  if(strength==='2') max=CONFIG.gPerKgMaxStrength;\n  if(goal==='build'||goal==='loss') max=Math.max(max, CONFIG.gPerKgMaxLoss);\n  const min=goal==='loss'?1.4:CONFIG.gPerKgMin;\n  const gMin=Math.round(min*cw), gMax=Math.round(max*cw);\n  const meals=(age>=65)?'3-4 (min. 30-40 g elk)':'3-4';\n  const mealsN=3.5;\n  const pmMin=Math.max(age>=65?30:CONFIG.mealTarget[0], Math.round(gMin\/mealsN\/5)*5);\n  const pmMax=Math.min(45, Math.max(pmMin+5, Math.round(gMax\/mealsN\/5)*5));<\/p>\n<p>  document.getElementById('rRange').innerHTML=`${gMin}\u2013${gMax}<small> gram<\/small>`;\n  document.getElementById('rPerKg').textContent=`${min.toFixed(1)}\u2013${max.toFixed(1)}`;\n  document.getElementById('rPerMeal').textContent=`${pmMin}\u2013${pmMax} g`;\n  document.getElementById('rPerMealLabel').textContent=`per eetmoment (${meals})`;\n  document.getElementById('rNoteWeight').style.display=adjusted?'block':'none';\n  document.getElementById('rNoteAge').style.display=(age>=65)?'block':'none';\n  const stTxt={\n    '0':'Eiwit beschermt spieren pas echt in combinatie met krachtprikkels. Twee korte krachttraining-momenten per week (thuis met eigen lichaamsgewicht kan al) zijn d\u00e9 maatregel tegen spierverlies met de jaren \u2014 meer nog dan extra eiwit alleen.',\n    '1':'Mooie start. De stap van 1\u00d7 naar 2\u00d7 krachttraining per week levert het meeste op voor spierbehoud, en rechtvaardigt de hogere eiwit-bovengrens.',\n    '2':'Sterk \u2014 met \u22652\u00d7 krachttraining per week benut je de hogere bovengrens ook echt. Eet binnen enkele uren na je training een eiwitrijk moment en verdeel de rest over de dag.',\n  };\n  document.getElementById('rNoteStrengthText').textContent=stTxt[strength];\n  document.getElementById('printMeta').textContent=`Eiwit-richtwaarde gegenereerd op ${new Date().toLocaleDateString('nl-NL',{day:'numeric',month:'long',year:'numeric'})} \u00b7 Celluviva \u00b7 celluviva.nl \u00b7 Educatief hulpmiddel, geen medisch advies.`;\n  if(CONFIG.newsletterAction){ document.getElementById('captureForm').action=CONFIG.newsletterAction; document.getElementById('capture').style.display='block'; }\n  document.getElementById('result').style.display='block';\n  document.getElementById('result').scrollIntoView({behavior:'smooth'});\n}\n<\/script>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Celluviva \u00b7 Gratis tool Eiwitbehoefte-calculator 40+ Vanaf je veertigste verlies je geleidelijk spiermassa (sarcopenie) \u2014 en spierweefsel reageert dan minder sterk op eiwit. Voldoende eiwit \u00e9n krachtprikkels zijn de best onderbouwde manieren om spier, kracht en zelfstandigheid op de lange termijn te behouden. Bereken je persoonlijke richtwaarde. 1Jouw gegevens Gewicht (kg) Lengte (cm) Leeftijd (jaren) [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":7686,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_fable_quick_answer":"","_fable_evidence_tier":"","_fable_faq":"","_fable_sources":"","_fable_reviewed":"","_fable_area":"","_fable_hub_category":"","_fable_content":"","footnotes":""},"class_list":["post-7865","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/celluviva.com\/nl\/wp-json\/wp\/v2\/pages\/7865","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/celluviva.com\/nl\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/celluviva.com\/nl\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/celluviva.com\/nl\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/celluviva.com\/nl\/wp-json\/wp\/v2\/comments?post=7865"}],"version-history":[{"count":1,"href":"https:\/\/celluviva.com\/nl\/wp-json\/wp\/v2\/pages\/7865\/revisions"}],"predecessor-version":[{"id":7872,"href":"https:\/\/celluviva.com\/nl\/wp-json\/wp\/v2\/pages\/7865\/revisions\/7872"}],"up":[{"embeddable":true,"href":"https:\/\/celluviva.com\/nl\/wp-json\/wp\/v2\/pages\/7686"}],"wp:attachment":[{"href":"https:\/\/celluviva.com\/nl\/wp-json\/wp\/v2\/media?parent=7865"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}