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Intermittent Fasting Blog & Guides

Evidence-based guides, plans, and answers — reviewed by registered dietitians.

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Intermittent Fasting and Hypoglycemia: What to Know Before You Skip Meals
Metabolic Health

Intermittent Fasting and Hypoglycemia: What to Know Before You Skip Meals

If you have hypoglycemia, recurring low blood sugar, or use medicine that can lower blood glucose, intermittent fasting is not a self-guided schedule...

Does Sleeping Count as Fasting? How to Count Overnight Hours
Intermittent Fasting

Does Sleeping Count as Fasting? How to Count Overnight Hours

Yes. In an everyday intermittent-fasting routine, sleep counts as part of your fasting window when you are not consuming calories. The clock starts af...

Does Olive Oil Break a Fast? What Calories Mean for Your Fasting Window
Eating & Nutrition

Does Olive Oil Break a Fast? What Calories Mean for Your Fasting Window

Yes. If your fasting rule is calorie-free, drinking or taking olive oil during the fasting window ends that window because olive oil provides calories...

48-Hour Fast: Safety, Stop Signs, and How to Break It
Fasting Plans

48-Hour Fast: Safety, Stop Signs, and How to Break It

A 48-hour fast means going two full days without calorie-containing food. It is an extended fast, not a beginner default or a shortcut to a particular...

Intermittent Fasting: A Complete Guide to Schedules, Food, and Safety
Intermittent Fasting

Intermittent Fasting: A Complete Guide to Schedules, Food, and Safety

Intermittent fasting is an eating pattern that alternates between periods of eating and periods without food. It focuses mainly on when you eat, but t...

Weight Fluctuation During Intermittent Fasting: How to Read the Scale
Weight Loss

Weight Fluctuation During Intermittent Fasting: How to Read the Scale

Daily scale changes during intermittent fasting do not necessarily reflect daily fat gain or loss. Water balance, food and fluid still being digested,...

15:9 Intermittent Fasting: How It Works and How to Start
Fasting Plans

15:9 Intermittent Fasting: How It Works and How to Start

15:9 intermittent fasting means fasting for 15 hours and eating within a 9-hour window each day. For example, you might finish dinner at 7 p.m., fast...

20:4 Intermittent Fasting Results After 1 Month: What to Expect
Weight Loss

20:4 Intermittent Fasting Results After 1 Month: What to Expect

20:4 intermittent fasting means fasting for 20 hours and eating within a 4-hour window. After one month, some people may notice a downward weight tren...

Best Electrolytes for Intermittent Fasting: What to Look For
Eating & Nutrition

Best Electrolytes for Intermittent Fasting: What to Look For

The best electrolyte for intermittent fasting is not necessarily a specific brand or the product with the largest dose. For many people doing a short...

Intermittent Fasting Ketosis Chart
Intermittent Fasting

Intermittent Fasting Ketosis Chart

An intermittent fasting ketosis chart can show a general pattern: ketone levels may begin to rise as fasting continues, but there is no single hour wh...