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4 Weeks of Alternate-Day Fasting Aids Weight Loss, but Reduces Muscle

Rubenhair Latvia
2 min read
04.01.2026
4 Weeks of Alternate-Day Fasting Aids Weight Loss, but Reduces Muscle

**The Effects of Alternate-Day Fasting on Weight Loss** Researchers have found that alternate-day fasting can be an effective way to reduce body mass and fat mass, but it may also lead to a loss of muscle mass.

**The Effects of Alternate-Day Fasting on Weight Loss**

Researchers have found that alternate-day fasting can be an effective way to reduce body mass and fat mass, but it may also lead to a loss of muscle mass. This type of intermittent fasting involves eating normally one day and then restricting calorie intake the next.

A recent study published in the journal Nutrients found that participants who followed a 4-week alternate-day fasting protocol showed significant reductions in body fat, but also experienced a loss of muscle mass. The researchers noted that daily exercise is important when following this type of eating plan to maintain muscle mass and overall health.

**The Study's Findings**

The study involved two groups of Asian males, ages 21-35, with a BMI greater than 23. One group was assigned to a four-week alternate-day fasting protocol, while the other group received a 25-gram whey protein supplement on fasting days to determine if this would help reduce muscle mass loss.

The results showed that participants who followed the alternate-day fasting regimen experienced significant reductions in body mass and fat mass. However, they also lost muscle mass, even with the addition of protein supplements. The researchers noted that a calorie deficit can lead to weight loss, but also frequently results in muscle loss.

**Expert Insights**

Dr. Dana Hunnes, a senior clinical dietitian at UCLA Health, commented on the study's findings, stating that it was not surprising that participants experienced muscle loss while following the alternate-day fasting regimen. Dr. Mir Ali, a general surgeon and bariatric surgeon, noted that the study demonstrated the nuances of weight loss programs and highlighted the importance of daily exercise when following this type of eating plan.

**Conclusion**

While alternate-day fasting may be an effective way to reduce body mass and fat mass, it is essential to note that it can also lead to a loss of muscle mass. It is crucial to incorporate regular exercise into your routine when following this type of eating plan to maintain overall health and well-being.

**Learn More**

Our clinic offers personalized weight loss programs tailored to your specific needs and goals. Contact us today to schedule an appointment and learn more about how we can help you achieve a healthier lifestyle.

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