How does TDEE work then? I had thought that you found out your TDEE on one of the recommended sites and that was your calorie allowance for your non-fast days. Am I being naive?
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TDEE is the amount of energy you use in a day. Calculations and web site tools can estimate your TDEE but the can never know it.
Lab tests are available to measure it, but most of us don't have access to those.
So if you're eating x calories and not losing or gaining weight then TDEE=x.
If you are gaining or not losing then the above allows you to estimate what your TDEE is from the rate of change of weight.
Lab tests are available to measure it, but most of us don't have access to those.
So if you're eating x calories and not losing or gaining weight then TDEE=x.
If you are gaining or not losing then the above allows you to estimate what your TDEE is from the rate of change of weight.
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The maths of not losing
by PhilT on 17 Apr 2013, 14:34
For them to be in energy balance eating F calories per day on feed days with either 500 or 600 on fast days with a daily energy requirement of T (TDEE) the energy balance over a week says that :-
7 * T = 2 * 500 + 5 * F for men, or 7 * T = 2 * 600 + 5 * F for men
rearranging and straightening out this becomes :-
F = 1.4 * T - 200 for women, or F = 1.4 * T - 240 for men on 600 cal fasts.
So if a lady with a TDEE of 1800 isn't losing weight with 500 cal fast days then she's eating 1800 * 1.4 - 200 = 2320 on feed days and needs to back off about 500 calories a day to get up to full speed weight loss.
A lower metabolic rate such as 1400 TDEE works through to a feed day intake of 1760 with no loss, requiring a cut back of 360 calories per day on feed days.