[{"data":1,"prerenderedAt":251},["ShallowReactive",2],{"blog-en-why-weight-jumps-water-vs-fat":3},{"_path":4,"_dir":5,"_draft":6,"_partial":6,"_locale":7,"title":8,"description":9,"slug":10,"date":11,"cover":12,"category":13,"tags":14,"translationSlug":20,"body":21,"_type":245,"_id":246,"_source":247,"_file":248,"_stem":249,"_extension":250},"\u002Fen\u002Fblog\u002F2026-08-20-why-weight-jumps-water-vs-fat","blog",false,"","Why your weight jumped after a holiday: it's water, not fat","Back from holiday up 2-3 kg in a week? Here's the math on why it's almost certainly water, not fat — salt, glycogen, gut contents and alcohol. How much fat it could really be, and what to do so the weight settles back.","why-weight-jumps-water-vs-fat","2026-08-20","\u002Fblog\u002Fimages\u002Fwhy-weight-jumps-water-vs-fat\u002Fcover.jpg","guides",[15,16,17,18,19],"weight","water","deficit","motivation","scale","pochemu-ves-skachet-voda-ili-zhir",{"type":22,"children":23,"toc":236},"root",[24,40,47,73,78,84,89,134,140,159,165,170,184,190,202,207,213,218,231],{"type":25,"tag":26,"props":27,"children":28},"element","p",{},[29,32,38],{"type":30,"value":31},"text","You get back from holiday, step on the scale — up 2-3 kg in a week. First thought: \"it's all ruined, summer undid everything\". Relax. Let's look at the numbers for why that jump is almost certainly ",{"type":25,"tag":33,"props":34,"children":35},"strong",{},[36],{"type":30,"value":37},"water, not fat",{"type":30,"value":39}," — and what to do about it (spoiler: not starve in response).",{"type":25,"tag":41,"props":42,"children":44},"h2",{"id":43},"the-math-first",[45],{"type":30,"value":46},"The math first",{"type":25,"tag":26,"props":48,"children":49},{},[50,52,57,59,64,66,71],{"type":30,"value":51},"1 kg of fat is about ",{"type":25,"tag":33,"props":53,"children":54},{},[55],{"type":30,"value":56},"7700 kcal",{"type":30,"value":58},". To gain 3 kg of fat in a week you'd need to eat ",{"type":25,"tag":33,"props":60,"children":61},{},[62],{"type":30,"value":63},"+23000 kcal above your maintenance",{"type":30,"value":65}," — roughly ",{"type":25,"tag":33,"props":67,"children":68},{},[69],{"type":30,"value":70},"+3300 kcal every single day",{"type":30,"value":72}," on top of what your body already burns. Even at generous holiday feasts, piling that on day after day is nearly impossible.",{"type":25,"tag":26,"props":74,"children":75},{},[76],{"type":30,"value":77},"The conclusion is simple: gaining 3 kg of pure fat in a week is physically very hard. So most of what the scale showed isn't fat.",{"type":25,"tag":41,"props":79,"children":81},{"id":80},"what-it-actually-is",[82],{"type":30,"value":83},"What it actually is",{"type":25,"tag":26,"props":85,"children":86},{},[87],{"type":30,"value":88},"A post-holiday weight jump is mostly water and gut contents:",{"type":25,"tag":90,"props":91,"children":92},"ul",{},[93,104,114,124],{"type":25,"tag":94,"props":95,"children":96},"li",{},[97,102],{"type":25,"tag":33,"props":98,"children":99},{},[100],{"type":30,"value":101},"Salt.",{"type":30,"value":103}," Restaurant, salty and processed food retains water — plus 1-2 kg builds up easily and stays until you return to your usual routine.",{"type":25,"tag":94,"props":105,"children":106},{},[107,112],{"type":25,"tag":33,"props":108,"children":109},{},[110],{"type":30,"value":111},"Carbs and glycogen.",{"type":30,"value":113}," More carbs on holiday means the body stores glycogen, which binds water: 1 g of glycogen holds about 3 g of water. Hence a fast \"gain\" on the scale that has nothing to do with fat.",{"type":25,"tag":94,"props":115,"children":116},{},[117,122],{"type":25,"tag":33,"props":118,"children":119},{},[120],{"type":30,"value":121},"Gut contents.",{"type":30,"value":123}," You ate more and richer food, so there's simply more of it physically \"in progress\" through digestion. That's weight too, but temporary.",{"type":25,"tag":94,"props":125,"children":126},{},[127,132],{"type":25,"tag":33,"props":128,"children":129},{},[130],{"type":30,"value":131},"Alcohol.",{"type":30,"value":133}," It triggers fluid retention, so after holiday drinks the morning number is almost always inflated.",{"type":25,"tag":41,"props":135,"children":137},{"id":136},"how-much-fat-really",[138],{"type":30,"value":139},"How much fat, really",{"type":25,"tag":26,"props":141,"children":142},{},[143,145,150,152,157],{"type":30,"value":144},"If there was a calorie surplus at all (and on holiday there probably was), it's more like ",{"type":25,"tag":33,"props":146,"children":147},{},[148],{"type":30,"value":149},"+0.3-0.5 kg of fat",{"type":30,"value":151},", not 3. Everything else on the scale is water, which leaves within ",{"type":25,"tag":33,"props":153,"children":154},{},[155],{"type":30,"value":156},"3-7 days",{"type":30,"value":158}," once eating returns to normal: less salt, less carb excess, your usual routine.",{"type":25,"tag":41,"props":160,"children":162},{"id":161},"what-not-to-do",[163],{"type":30,"value":164},"What NOT to do",{"type":25,"tag":26,"props":166,"children":167},{},[168],{"type":30,"value":169},"The main mistake is to crash-diet in response to the \"scary number\". A sharp cut after a holiday sets off new swings: harsh restriction → breakdown → rebound. You try to \"sweat off\" water with hunger and get stress and overeating a few days later instead.",{"type":25,"tag":26,"props":171,"children":172},{},[173,175,182],{"type":30,"value":174},"What works instead: just return to your normal routine — a moderate deficit, a ",{"type":25,"tag":176,"props":177,"children":179},"a",{"href":178},"\u002Fen\u002Fblog\u002Fhow-to-get-back-on-track-after-summer",[180],{"type":30,"value":181},"calm step-by-step restart",{"type":30,"value":183},", enough protein and water. The weight settles on its own, no drama.",{"type":25,"tag":41,"props":185,"children":187},{"id":186},"how-to-see-the-truth",[188],{"type":30,"value":189},"How to see the truth",{"type":25,"tag":26,"props":191,"children":192},{},[193,195,200],{"type":30,"value":194},"The trick is not to look at a single morning number but to follow the ",{"type":25,"tag":33,"props":196,"children":197},{},[198],{"type":30,"value":199},"trend over 1-2 weeks",{"type":30,"value":201},". Daily weight can swing ±1-2 kg from salt, water and that same glycogen — that's noise. The direction over a couple of weeks tells the truth; one day means nothing.",{"type":25,"tag":26,"props":203,"children":204},{},[205],{"type":30,"value":206},"Practically: weigh in under the same conditions (morning, fasted, after the bathroom) and look at the weekly average rather than the spread between days. That way a \"jump\" stops being scary, because you can see the real line.",{"type":25,"tag":41,"props":208,"children":210},{"id":209},"takeaway",[211],{"type":30,"value":212},"Takeaway",{"type":25,"tag":26,"props":214,"children":215},{},[216],{"type":30,"value":217},"Plus 2-3 kg in a week after a holiday is almost always water: salt, glycogen, gut contents and alcohol. Gaining that much fat in a week is impossible on the calories. Don't panic, don't starve — just return to your routine, and the excess leaves within a few days. And to stop fearing the numbers, watch the trend, not a single morning.",{"type":25,"tag":26,"props":219,"children":220},{},[221,223,229],{"type":30,"value":222},"In ",{"type":25,"tag":176,"props":224,"children":226},{"href":225},"\u002F",[227],{"type":30,"value":228},"NutriApp",{"type":30,"value":230}," you can keep a weight log and see the trend rather than individual spikes — so it's easier not to jump to conclusions after a salty dinner or a holiday.",{"type":25,"tag":26,"props":232,"children":233},{},[234],{"type":30,"value":235},"So does your weight swing a lot after the weekend, or hold steady? Share it in the VK discussion.",{"title":7,"searchDepth":237,"depth":237,"links":238},2,[239,240,241,242,243,244],{"id":43,"depth":237,"text":46},{"id":80,"depth":237,"text":83},{"id":136,"depth":237,"text":139},{"id":161,"depth":237,"text":164},{"id":186,"depth":237,"text":189},{"id":209,"depth":237,"text":212},"markdown","content:en:blog:2026-08-20-why-weight-jumps-water-vs-fat.md","content","en\u002Fblog\u002F2026-08-20-why-weight-jumps-water-vs-fat.md","en\u002Fblog\u002F2026-08-20-why-weight-jumps-water-vs-fat","md",1788439137946]