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Fasted training means hitting the mat or lifting weights on an empty stomach, without having replenished your glycogen reserves the night before. This practice, popular among those who want to promote fat loss or exercise despite a tight schedule, generates both enthusiasm and reservations. Here's an overview of its benefits and limitations.
Why consider fasted strength training?
When you start an exercise session on an empty stomach, your body, deprived of circulating sugar, first draws on its fat reserves via lipolysis: fatty acids are released to provide the necessary energy. This reaction is often accompanied by an increase in growth hormone, which is conducive to long-term muscle mass preservation. For those looking to combine fasted cardio with short training sessions (20-30 minutes), it's a way to maximize the utilization of stored fat.
Tangible benefits
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Targeted weight loss: In the absence of glycogen, the body increases lipid mobilization, which can accelerate fat loss if caloric intake is otherwise controlled.
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Time-saving: Starting your day with a quick fasted session frees up the afternoon for other activities.
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Insulin sensitivity: Getting used to this process can improve glucose management and hormonal response, beneficial for metabolic health.
Risks and limitations to be aware of
Systematically doing fasted exercise also has disadvantages. Without glycogen, performance drops; you won't be able to lift heavy loads or do intense sets. The risk of drawing on your amino acids (the building blocks of your muscle fibers) increases if the session lasts more than 30 minutes, threatening your muscle mass. Finally, experiencing feelings of fatigue or dizziness, or even panicking when out of breath, is not ideal: it's best reserved for light training sessions or fasted cardio, not for a large volume of strength training.
Best practices for "fasted" strength training
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Limit to 20-30 minutes : Focus on low-volume multi-joint exercises or a short cardio session.
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Hydrate well: Water and a little salt before the session prevent headaches and cramps.
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Plan a post-workout snack (simple carbohydrates + 15-20g protein) to stop muscle breakdown and restart protein synthesis.
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Alternate: Vary fasted strength training with classic sessions to keep glycogen reserves available when performance is paramount.
Should you start?
If your main goal is muscle gain, it's better to keep your reserves full. However, to promote fat loss without completely sacrificing your schedule, experimenting with 1 to 2 fasted sessions per week can be useful. Listen to your body: excessive burning sensations, dizziness, or tachycardia during fasted exercise are signals to switch back to fed training.
