How intermittent fasting works
Intermittent fasting cycles between an eating window and a fasting window. The popular 16:8 means 16 hours fasting and an 8-hour eating window — for example eating between noon and 8 pm. During the fast you have only water, black coffee, or plain tea.
Common methods
- 16:8 — beginner-friendly, easy to sustain.
- 18:6 / 20:4 — shorter eating window, more discipline.
- OMAD — one meal a day; advanced.
Does it help?
Fasting mainly helps by making it easier to eat fewer total calories — there's nothing magic about the clock itself. It suits people who prefer fewer, larger meals. It isn't ideal for everyone (including some with a history of disordered eating, diabetes, or who are pregnant) — check with a doctor if unsure.
Limitations
Most of the research comparing fasting schedules to standard calorie-controlled diets finds similar results when total calories and protein are matched — the main benefit for many people is behavioural (a simpler way to eat less) rather than a unique metabolic effect.