Nutrition Facts with Dr. Greger cover image

Nutrition Facts with Dr. Greger

The Best Time to Exercise for Weight Loss

Nov 9, 2023
Exploring the best time to exercise for weight loss, examining fat burning in a fasted state vs. a fed state, the role of carbohydrate metabolism, and the impact of exercise timing on glycogen and insulin release. Analyzing the effects of pre-meal and post-meal exercise on weight loss, and discussing optimal timing for exercise and blood sugar control in individuals with diabetes.
12:14

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Quick takeaways

  • Exercising before a meal leads to more fat being burned during the exercise compared to exercising after a meal.
  • Exercising before a meal may lead to sustained fat burning throughout the day, even with low to moderate intensity activity.

Deep dives

Exercising before a meal leads to more fat burn during exercise

Multiple experiments have consistently found that exercising on an empty stomach, before a meal, results in more fat being burned during the exercise compared to exercising after a meal. On average, low to moderate intensity activity before a meal burns about three grams more fat than the same exercise performed after a meal.

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