Weight loss = Calories burned - Calories consumed ???

[Cionn]

If I burn 2770 calories per day, & I consume 2000 calories per day, & 7700 calories = 1 Kg, does that mean that, in theory, after 10 days I should have lost 1 Kg?

7700(cal/Kg) / (2770-2000)(cal/day)  = 10 (days/Kg)

[TNWCH]

In theory yes, but the real answer is not necessarily.

The formula you used is a simplification of what really happens.  Your body also does things to maintain a balance and the number may not be what you think.

[awood08]

I eat on average a calorie deficit of 1000-1500 depending on my excercise that day. Realistically I'm burning 7000-10000 calories more than I take in per week (3500 calories = 1 lb of fat). Some weeks I drop a pound or less, some I drop 3-4 pounds. Honestly there isn't an exact science. Best thing is always to eat healthy, control your portions, and stay active. If you obsess over the numbers you are likely to stress more and that will delay your weight loss. Just by working out 3-4 times a week and watching what I eat and choosing healthier options, I've lost 40 pounds in 4 months.

[I-train-hard]

We need some basic info to give you any advice. We are not magicians.

Nonetheless; I can tell you this, you will not lose fat, you will lose water.

You don’t want to lose H2O – you brain and hart needs it to work properly.

[Heybales]

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@Cionn wrote:

If I burn 2770 calories per day, & I consume 2000 calories per day, & 7700 calories = 1 Kg, does that mean that, in theory, after 10 days I should have lost 1 Kg?

7700(cal/Kg) / (27**personal info removed**)(cal/day)  = 10 (days/Kg)

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If you got an accurate logging on both sides of that equation - most likely.

And most likely you never will.

And if that is an unreasonable deficit for amount of weight to be lost - you'll lose muscle mass too, which is less calories per KG - so that will throw the numbers off.

Besides also changing what you burn daily.

Fitbit is basing burn estimate on average healthy body matching your stats - many people make their body unhealthy with extreme diets and exercise and health issues anyway - so the estimate is off.

If over time a math average of 2-3 lbs weekly is turning into 1 lb or less actual weight loss - either the logging is really off - or the body is adapting to that extreme diet in a bad way - be concerned when that happens. Especially when body no longer feels hungry eating so little to attempt that.

[Jojo18]

i find that too...