Do Ozempic and Mounjaro Replace Exercise?

In recent years, weight-loss medications such as Ozempic, Wegovy, and Mounjaro have gained significant attention worldwide. Many people looking to lose weight are asking the same question: If I use these medications, do I still need to exercise? The short answer is no medication can replace exercise.

These medications can lead to significant weight loss by reducing appetite, increasing feelings of fullness, and improving blood sugar control. However, an important point to consider is that not all the weight lost is body fat. Studies have shown that some of the weight loss may come from lean body mass, including muscle tissue. If not properly addressed, this could contribute to reduced strength, lower metabolic capacity, and potentially increase the risk of weight regain over time.

This is where exercise, particularly resistance training, plays a crucial role. Weightlifting and other strength-training exercises help preserve muscle mass and ensure that a greater proportion of weight loss comes from body fat. In addition, exercise improves insulin sensitivity, supports cardiovascular health, helps maintain bone density, and positively affects mood and cognitive function — benefits that medication alone cannot fully replace.

Ultimately, the best approach to sustainable weight loss is a combination of physician-prescribed medication, a balanced diet, adequate protein intake, and regular physical activity.

The goal should not simply be to see a lower number on the scale. What truly matters is preserving muscle mass, maintaining physical function, protecting long-term health, and preventing weight regain.

References

Wilding JPH, et al. Once-Weekly Semaglutide in Adults with Overweight or Obesity. New England Journal of Medicine. 2021.

GLP-1 Agonists and Exercise: The Future of Lifestyle Prioritization. 2025.

Circulation. Muscle Mass and GLP-1 Receptor Agonists. 2024.