Weigh yourself every morning for two weeks and you'll see jumps of 1–2kg that have nothing to do with fat. Understanding why makes the scale a useful tool instead of a mood ruiner.
The main causes of daily swings
- Salt: a salty meal makes your body hold extra water for a day or two.
- Carbohydrates: each gram of stored glycogen is held with roughly 3g of water, so a high-carb day can add a kilo.
- Food in transit: the weight of food and fibre still in your digestive system.
- Hard training: muscle repair causes temporary fluid retention.
- Hormones: many women retain water in the days before a period.
- Stress and poor sleep: both can increase water retention.
Why fat can't change that fast
A kilogram of body fat stores roughly 7,700 kcal. To gain a kilogram of fat overnight you'd need to eat about 7,700 kcal more than you burn — so overnight jumps are almost always water.
How to weigh yourself properly
- Same time each day — first thing in the morning, after the toilet, before food or drink.
- Same scale, on a hard floor.
- Judge the weekly trend, not single readings.
Mealify draws a smoothed trend line through your weigh-ins and calculates your true weekly rate of change, filtering out water noise automatically. If daily weighing affects your mood, weigh twice a week instead — the trend still works.