[noxxten]

I think what he's getting at is more along the lines of people losing weight and being healthier on any form of diet because before going on any diet, some people are drinking soda by the gallon and eating whatever the body wants, when it wants. Doing that means that for most people, they're consuming far more than 2k calories a day, most from "craving" sources like fat, sugar, and/or other emotionally rewarding food groups.

Going on any sort of diet sort of controls all that, and makes the person more vigilant of what's going into their body. So going from consuming wildly more than 2k calories a day, they might be consuming something closer to what their body actually needs, or less even. Metabolism catches up, and if the person is dieting, then they usually tack on some extra exercise too and that further helps their overall health etc.