Originally Posted By: Ch-ch-ch-cheeeeeto

Weight loss or gain isn't actually calories in vs. calories out. It's more accurately calories absorbed vs. calories burned. In other words, (a) the human digestive system doesn't run at optimal efficiency, and probably varies in its absorbtion abilities between individuals; and (b) certain types of energy-spiking foods probably lead to increased burn rates through mechanisms like NEAT and changed sleep patterns.

This seems to be contested territory but science moving towards this position.

All the sailors with their seasick mamas hear the sirens on the shore.