- A calorie is not a calorie when you eat it at a different time of day.
- A calorie is not a calorie when you eat it in a differently processed form.
- A calorie is not a calorie when you eat it as a wholly different food.
- A calorie is not a calorie when you eat it as protein, instead of carbohydrate or fat.
- A calorie is not a calorie when you change the type of fat, or when you substitute it for sugar.
- Controlled weight-loss studies do not produce results consistent with "calorie math".
- Even if all calories were equal (and we've proven they're not), the errors in estimating our true "calorie" intake exceed the changes calculated by the 3500-calorie rule ("calorie math") by approximately two orders of magnitude.
Empirical Evidence: A Calorie Is Not A Calorie When You Add Carbohydrate To A Zero-Carb Diet
There are many anecdotal reports of people finding it difficult or impossible to gain weight on a zero-carb diet, even with massive overfeeding. Yet there are controlled trials that seem to show high-fat diets having no such overfeeding advantage. Why not?
Comment: In case this is not enough, you might want to read 146 reasons why sugar destroys your health.