Why the scale jumps 1-2 kg overnight
The scale can jump 1-2 kg in a single night, and almost none of it is fat. To gain 1 kg of real fat you would need about 7700 kcal above what you burn - impossible in a day. The overnight jump is water, salt, stored sugar (glycogen) and food still moving through you. Wait a few days before you worry.
You wake up, step on the scale, and it is 1.5 kg higher than yesterday. Your stomach drops. Did you really gain all that overnight? Take a breath. The number is real, but what it means is much smaller than it looks.
If the scale jumps 1-2 kg overnight, I gained 1-2 kg of fat.
falseFalse. To gain 1 kg of fat you need about 7700 kcal of extra food above what you burn - far more than anyone eats in a day. The overnight jump is water, salt holding that water, glycogen (stored sugar, which holds 3-4 g of water per gram), and food still in your gut. None of that is fat.
So weighing myself every day is the best way to track fat loss.
it dependsIt depends - and for most people, daily weighing is more noise than signal. Day-to-day jumps are mostly water and food weight. A weekly average, or the trend over a month, shows the real fat story far better than any single morning.
Read the scale the smart way
- Weigh once a week, same morning, after the toilet and before tea or water.
- Look at the 4-week trend, not one reading. Trends don't lie; single days do.
- Track your waist and how clothes fit - they show fat loss the scale can hide.
- A salty meal or a carby day can add 1-2 kg of water for a few days. Wait it out.
The bottom line
A 1-2 kg overnight jump is almost all water, salt, glycogen and food-in-gut - not fat. Gaining 1 kg of real fat needs about 7700 extra kcal, which a single day cannot do. Weigh weekly, watch the trend, and let a salty or heavy day settle for 3-4 days before you read anything into it.