How often should you do an 18-hour fast?

How often someone follows an 18-hour fast depends on their routine, energy needs, health background, and personal tolerance. Some people follow 18/6 several days per week, while others use it occasionally. If daily fasting feels too restrictive, try 14:10 or 16:8 instead.

How do you start 18/6 fasting?

A gradual approach may make 18/6 fasting easier to test, such as shortening the eating window over time. Begin with 12:12 or 14:10, then move toward 16:8 before trying 18:6. This gives you time to adjust your meals, caffeine timing, hydration, and workouts.

Does an 18-hour fast put you into ketosis?

An 18-hour fast may increase ketone production for some people, but the timing varies. Your previous meals, carbohydrate intake, exercise, and individual metabolism all influence whether ketosis becomes noticeable.

Does an 18-hour fast trigger autophagy?

An 18-hour fast may influence autophagy-related pathways, but there’s no universal 18-hour switch. Autophagy is complex and difficult to measure in everyday fasting routines, so it shouldn’t be treated as a predictable result.

Is 18/6 intermittent fasting different for women and men?

18/6 intermittent fasting can feel different from person to person, but broad sex-specific rules are difficult to support. Hunger, energy, training, sleep, and personal tolerance are more useful signals than gender alone. People who are pregnant or breastfeeding should not fast.

Can you drink coffee during an 18-hour fast?

Yes, black coffee can fit into an 18-hour fasting window if it’s plain and unsweetened. Milk, cream, sugar, syrups, and sweetened creamers add calories and may not fit a strict fasting window.