GLP-1 Drugs & Muscle Loss: Risks, Prevention & Diet Tips

New research indicates that individuals undergoing weight loss treatment with GLP-1 medications, such as semaglutide and tirzepatide, can minimize muscle loss by incorporating strength training and ensuring adequate protein intake, alongside guidance from an obesity medicine specialist. The findings, to be presented at the European Congress on Obesity (ECO) in 2025, suggest these strategies can lead to significant fat loss while preserving lean muscle mass.

GLP-1 Medications and Muscle Loss Concerns

GLP-1 (glucagon-like peptide-1) receptor agonists have become increasingly popular for both managing type 2 diabetes and promoting weight loss. These medications work by mimicking the effects of the naturally occurring GLP-1 hormone, which regulates blood sugar, slows stomach emptying, and suppresses appetite. While effective for weight reduction, a significant concern has emerged regarding the potential for muscle loss during treatment.

Losing muscle mass isn’t just a cosmetic issue; it can negatively impact metabolism, strength, balance, and long-term health, potentially hindering sustained weight management. However, researchers are actively investigating ways to mitigate this side effect.

Key Strategies for Preserving Muscle Mass

A six-month study involving 200 adults with overweight or obesity revealed three key components for minimizing muscle loss while using GLP-1 or dual GLP-1/GIP receptor agonists: supervised care, strength training, and sufficient protein consumption. The research was conducted by obesity experts in New York.

• Strength Training: Engaging in strength training exercises two to four times per week is crucial for maintaining muscle mass during weight loss.
• Adequate Protein Intake: Consuming between 1.2 to 1.6 grams of protein per kilogram of body weight daily (approximately 90 to 120 grams for many adults) supports muscle preservation.
• Supervised Care: Receiving guidance from an obesity medicine specialist ensures a tailored approach to treatment and helps address individual needs and concerns.

According to a doctor’s guide published by UbieHealth on March 18, 2026, prioritizing sleep, hydration, and tracking strength and body composition are also important considerations when aiming to prevent muscle loss while on GLP-1 medications.

How GLP-1s Work and Potential Side Effects

GLP-1 agonists, including semaglutide and liraglutide, were initially developed to treat type 2 diabetes. They function by encouraging insulin release, reducing glucagon secretion, slowing gastric emptying, and suppressing appetite. These mechanisms contribute to weight loss but can also lead to gastrointestinal side effects like nausea and constipation.

The Cleveland Clinic notes that because GLP-1s slow down digestion, certain foods, such as spicy and high-fat items, can exacerbate gastrointestinal discomfort. It’s important to consume a variety of nutrient-rich foods, even while eating less to maintain health.

Dietary Recommendations While on GLP-1s

• Prioritize Protein: Lean protein sources like fish, chicken, tofu, and beans are essential for preserving muscle mass.
• Focus on Fiber: Incorporate fiber-rich foods such as whole grains (oats, quinoa, farro), fruits, and vegetables (leafy greens, apples, tomatoes) to promote fullness and combat constipation.
• Choose Nutrient-Dense Foods: Opt for foods packed with vitamins and minerals to ensure adequate nutrition despite reduced food intake.

Researchers have also linked popular obesity drugs to muscle loss via metabolic instability, according to a report from Dong-A Science. This highlights the importance of a comprehensive approach to managing weight loss with GLP-1s, focusing not only on reducing appetite but also on maintaining overall health and body composition.

Potential Risks and Future Research

While GLP-1 medications offer promising results for weight loss, concerns regarding potential risks, including muscle loss, persist. The Straits Times reported on the “dangerous” side of the “magic bullet” that is GLP-1s, cautioning about potential adverse effects. Ongoing research aims to further refine treatment strategies and minimize these risks, ensuring that individuals can benefit from the positive effects of these medications while maintaining their overall health and well-being.

The American Cancer Society is also investigating whether GLP-1s can reduce the risk of cancer, adding another layer to the ongoing research surrounding these medications.