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The maths of not losing
17 Apr 2013, 14:34

+ March 2013
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The maths of not losing

by PhilT on 17 Apr 2013, 14:34

If one believes in the energy balance - a calorie is a calorie and all that - then we can take a stab at how much someone who fails to lose weight on 5:2 is overeating on the 5 feed days.

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.
Last edited by PhilT on 17 Apr 2013, 14:35, edited 1 time in total.

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Fat burn rates

by PhilT on 11 Mar 2013, 20:28

Just testing the blog really, but interested in fat oxidation rates reported in scientific papers.

1. After 3 days total fasting the fat burn of young healthy weight men rose from 5.1 g/h to 5.7 g/h while their metabolic rate fell from 73.5 kcal/h to 67.8 kcal/h. Carbohydrate utilisation fell from 3.1 to 1.5 g/h reflecting a shift from carbohydrate to fat as fuel.

2. Obese women dieting using VLC diet showed a reduction in fat oxidation from 2.0 to 1.2 g/h while resting energy expenditure fell from 1246 to 1076 kcal/day. Carbohydrate oxidation increased from 5.0 to 6.3 g/h. Values are before / after a 13 kg weight loss / 10 kg fat loss.

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