When the maths is right but the scale is wrong (water, waste, time)
You ate in a deficit all week, logged every meal, and the scale still went up. The maths is right — water, salt, stored sugar and waste hide the fat you lost, and the scale needs time to catch up.
You had a perfect week. You logged every meal. You stayed under your calorie goal every single day. You walked, you tracked, you said no to the extra roti. Sunday morning you stepped on the scale. The number went UP. Your stomach drops. You feel cheated. You want to quit. But here is the truth: the maths is still right. The scale is just telling you a different story.
A week of deficit is real fat loss, even if the scale says no
Burnie works out your daily deficit as food total minus (BMR + active calories). If you ate less than you burned all week, you DID lose fat. About 7700 kcal of total deficit drops about 1 kg of real fat. So a week of 500 kcal daily deficit is about 3500 kcal total. That is roughly half a kilo of real fat gone from your body. The maths never lies. Fat left you. The scale just cannot see it yet.
If the scale went up after a perfect deficit week, my fat loss failed.
mostly falseMostly false. In one study, 42 out of 143 people with NO weight change had actually lost more than 1 kg of fat. The scale missed it completely. Water, salt, stored sugar, and waste can add more weight than the fat you lost. So the scale goes up while your fat goes down. The deficit worked. The scale is just late.
What the scale is actually weighing this week
What to do when the maths is right but the scale is wrong
The bottom line
The maths is right. The scale is just late. Water, salt, stored sugar, waste, and sore muscles can each add more weight than the half kilo of fat you lost this week. Trust your deficit log, keep logging, and give the scale two to three weeks to catch up. That is the maths working, not failing.