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Intermittent fasting is an eating pattern that cycles between periods of fasting and eating. It doesn't specify which foods you should eat but rather when you should eat them. Common methods include the 16/8 method (fasting for 16 hours and eating during an 8-hour window), the 5:2 method (eating normally for 5 days and drastically reducing calorie intake for 2 days), among others. People use intermittent fasting for various reasons, including improving metabolic health, losing weight, and other health benefits.