1. People on western diets. This isn't some hidden mystery.. it's in plain view. Plenty of studies done, or just ask _any_ doctor that sees patients, or any of

1. People on western diets. This isn't some hidden mystery.. it's in plain view. Plenty of studies done, or just ask _any_ doctor that sees patients, or any of your friends/family who have tried diets. Or search pubmed for diet adherence. 2. Because their base metabolic rate reduces over time to match their new reduced caloric intake.