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It's a simple matter of measuring the calorie content of the food going in minus that of the waste going out. There are many things that contain calories that
by jcoffland 8y ago
It's a simple matter of measuring the calorie content of the food going in minus that of the waste going out. There are many things that contain calories that humans don't digest well but the things we tend to eat have pretty consistent calorie digestion to waste ratios, regardless of the eater. Beliefs to the contrary are mostly driven by the food fad industry.