Losing weight often demands significant lifestyle changes—from adjusting diets to intensifying workouts. While the primary objective is typically to shed body fat while preserving or increasing muscle mass, many find themselves unintentionally losing muscle instead. This outcome can be detrimental to overall health and physical function.
“Losing muscle instead of fat is concerning because muscles are essential for movement and bodily function,” explains Dr. Gerardo Miranda-Comas, Assistant Professor of Rehabilitation Medicine at the Icahn School of Medicine at Mount Sinai. “A decline in muscle mass negatively impacts strength and endurance, resulting in reduced functional performance.”
Ideally, weight loss should target fat stores, not muscle. However, when calorie intake is insufficient or poorly managed, the body may break down muscle tissue before fat. “The body prefers carbohydrates (glucose) for energy. When glucose is scarce, it turns to glycogen stored in muscles and the liver,” Dr. Miranda-Comas adds.
Here are six key signs indicating you might be losing muscle during your diet:
1.Increased Difficulty During Workouts
If your exercise routine feels more strenuous than usual or you find it harder to complete your regular sets and reps, this could signal muscle loss. According to Dr. Spencer Nadolsky, author of The Fat Loss Prescription, “You’ll notice decreased strength and endurance in the gym.”
2.Weakness in Everyday Activities
Muscle loss isn’t confined to workouts. Struggling with routine tasks like climbing stairs, carrying groceries, or lifting luggage may indicate declining muscle mass. “Inadequate nutrition and overtraining can reduce muscle, impairing physical function,” notes Dr. Miranda-Comas.
3.Body Fat Percentage Remains Unchanged Despite Weight Loss
If the scale shows weight loss but your body fat percentage stays the same, you may be shedding muscle rather than fat. Dr. Nadolsky warns, “You’ll see smaller measurements, but the pinchable fat won’t decrease.”
4.Rapid Weight Loss
While fast weight loss can be motivating, it often leads to muscle loss unless you start with a high body fat percentage. “Sustainable weight loss is typically 1-2 pounds per week,” advises Dr. Nadolsky. Rapid drops are usually unsustainable and unhealthy.
5.Lack of Progress in Strength Training
Stagnation in your workout performance, such as inability to increase lifting weights, can indicate muscle depletion. Albert Matheny, founder of Soho Strength Lab, explains, “If you’re not progressing in training, it’s a sign your body’s nutritional needs aren’t being met.”
6.Chronic Fatigue
Feeling persistently tired might be a sign of insufficient calorie intake, especially carbohydrates. Without enough energy, your body may turn to muscle glycogen stores, accelerating muscle loss.
To protect muscle while losing fat, experts recommend aiming for a gradual weight loss of about one pound per week, corresponding to a daily calorie deficit of 200-500 calories tailored to your activity level. Consulting a registered dietitian or physician can help develop a safe and effective plan.
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