Glycogen and water
Your body stores carbs as glycogen, and each gram binds about three grams of water. More pasta and pizza means more water.
Guide · Weight & trend
Why you weigh more after the weekend
Monday morning, the scale, a jolt. Relax: most of it will be gone in a day or two.
In short
After a weekend of eating more, you'll often weigh 1–2 kg (2–4 lb) more. That's almost always water, not fat: salt and extra carbs make your body hold fluid, plus there's food in your digestive tract. After two to four normal days, most of it is usually gone.
The three main reasons
Salt
Restaurant food and snacks are often salty. Your body holds more water until the salt balance settles.
Food in transit
A big Sunday dinner is still partly in your gut on Monday morning – and it has weight.
Fat or water? Do the math
To gain a pound of fat you'd need roughly 3,500 calories above your normal burn (7,700 per kg). That's about four extra pizzas in one weekend. If you're 3 lb up on Monday, realistically only a small part of that is fat.
How to read your scale
- Trend over single readings: a smoothed line over several days shows the real direction. That's exactly what the weight trend in Weekfuel does.
- Same conditions: morning, after the bathroom, before breakfast.
- Don't overrate Mondays: compare week to week, for example the weekly average.
What you can do
- Eat normally and drink enough water.
- Go easy on salt and heavily processed food for a few days.
- Move – a walk helps, punishment workouts don't.
- Check again after three or four days.
Frequently asked questions
How long does weekend water weight last?
Usually two to four days of normal eating.
Should I skip weighing on Mondays?
You can weigh in, just don't overrate the number. Several weigh-ins a week give a better trend.
So weekends don't matter?
They do. Water goes away; a real surplus stays. That's why the weekly budget is worth watching.