Intermittent Fasting Calculator

Intermittent fasting restricts when you eat, not directly what. The practical mechanism in trials is mundane: a shorter window usually means fewer calories without counting. 16:8 — say, noon to 8 pm — is where most people land because it just skips breakfast.

IF suits people who dislike breakfast and grazing; it fights athletes needing fueled morning training. It's inappropriate in pregnancy, with a history of disordered eating, and with glucose-lowering medications without medical supervision. Coffee and water don't break the fast.