"When we exercise, we're always burning a mix of fuels mainly carbohydrates and fat. If you've fasted overnight, you'll generally burn a bit more fat and less carbohydrate than if you'd eaten breakfast, especially one high in carbs. But that doesn't mean fasted workouts are better for weight loss. We can only store a small amount of carbohydrate as glycogen in our muscles and liver. Any extra energy from carbs, fat or protein eventually gets stored as body fat."
"That doesn't make fasted workouts pointless, though. Research, including Gonzalez's own, suggests training in a fasted state can slightly improve metabolic health, particularly how well muscles adapt to exercise and how the body handles blood sugar spikes, which can lead to energy crashes. Fasted training seems to encourage muscles to move glucose out of the bloodstream, he says. So it can improve blood sugar control, especially after meals."
When exercising, the body burns a mix of fuels, mainly carbohydrates and fat. After an overnight fast, the body generally burns more fat and less carbohydrate than after eating, especially following a high-carbohydrate meal. Fat loss requires an overall energy deficit; excess carbohydrates, fat, or protein are eventually stored as body fat. Fasted training can modestly improve metabolic health by encouraging muscles to clear glucose from the bloodstream, improving post-meal blood sugar control and reducing energy crashes. The effects are most noticeable with endurance activities; high-intensity sessions rely heavily on carbohydrates. Consistency in exercise matters most. Start fasted sessions briefly and stop if light-headed.
Read at www.theguardian.com
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