Fast & Fit — Smart intermittent fasting & weight loss

Fast & Fit helps you lose weight and feel great with personalized intermittent fasting plans, a beautiful tracker, and science-backed guidance.

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Personalized 16:8, 18:6, and 20:4 fasting plans with a beautiful tracker, hydration reminders, and a coach in your pocket.

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Learn about intermittent fasting

Everything about IF, nutrition, and habits — clearly explained.

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Frequently asked questions

What is intermittent fasting?

Intermittent fasting (IF) is an eating pattern that cycles between periods of fasting and eating. It doesn't prescribe which foods to eat, but rather when you should eat them. Common methods include the 16:8 method, 5:2 diet, and eat-stop-eat.

Is intermittent fasting safe?

Intermittent fasting may be suitable for many healthy adults, but it is not right for everyone. If you are pregnant or breastfeeding, under 18, have a history of disordered eating, diabetes, low blood pressure, take medication affected by meals, or have a medical condition, speak with a healthcare professional before starting.

What can I drink during the fasting window?

Water, black coffee, plain tea, and sparkling water are generally allowed during a fast. These beverages have minimal or no calories and won't break your fast.

How long until I see progress?

Progress varies by person and depends on sleep, nutrition, activity, medical history, and consistency. Some users first notice better routine awareness or fewer late-night snacks. Weight changes are not guaranteed, so focus on sustainable habits and track trends over time.

● New • AI-guided fasting plans

Fast Smarter.
Lose Weight. Feel Amazing.

Personalized 16:8, 18:6, and 20:4 fasting plans with a beautiful tracker, hydration reminders, and a coach in your pocket.

★ 4.9★ App Store 2.4M+ fasts tracked Avg. -7kg in 90 days
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Fast&Fit app fasting timer screen