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Fasting Training: Pros, Cons and When It’s Worth It

Is training on an empty stomach better for burning fat? Does it harm hypertrophy? See up-to-date evidence and when each strategy makes the most sense.

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How the body responds to fasted training

Direct answer: When fasting (over 10 to 12 hours without food), the body prioritizes fat as an energy substrate due to low insulin and high glucagon/catecholamines.

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The real debate: fasted vs fed on 24-hour balance

Compared groups of women doing cardio in a fasted state vs. fed in a calorie deficit. Result: equal fat loss between both groups over 1 month. Acute difference during exercise is compensated by the daily balance.

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Fasting performance by modality

Modality Typical impact on fasting ------ Walk None Light to moderate running Minimum Moderate bike Minimum short HIIT Mild to moderate Light weight training Light Heavy Bodybuilding (Main Compounds) Moderate to signi...

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Prolonged fasting (20+ hours) and training

Fasting for more than 18 to 20 hours:

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BCAA and amino acids during fasted training

It has traditionally been argued that BCAA during fasted training preserves mass.

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When the body adapts to fasted training

After 4 to 6 weeks of regular fasted training:

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Fasting Training: Pros, Cons and When It’s Worth It

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