As Americans increasingly turn to GLP-1 medications that trigger rapid weight loss and a corresponding drop in lean muscle, fitness experts are urging adults to prioritize strength training and protein intake to preserve mobility. New York-based fitness coach Jacob Zemer, who trains clients aged 35 to 55, warns that muscle loss stems not just from medical treatments but from shifting lifestyle habits as people enter middle age.
Lifestyle Shifts and Hormonal Changes Drive Muscle Loss After Age 35
People naturally transition away from the active routines of their teens and twenties as careers and families take priority. Zemer told Fox News Digital that this drop in daily movement creates a more sedentary lifestyle that lowers metabolism and naturally reduces muscle mass.
Approaching age 40 brings hormonal changes for both men and women that alter how the body partitions calories. Zemer notes that the body directs fewer calories toward protein synthesis and muscle building, storing more as fat instead. This metabolic shift often causes people to accumulate weight around their midsection while losing underlying muscle.
Did you know? The U.S. Physical Activity Guidelines recommend that adults strength train at least two days per week, working all major muscle groups including the legs, hips, back, abdomen, chest, shoulders, and arms.
Four Strategies to Counter Age-Related Muscle Decline
Zemer outlines four practical strategies to help adults slow down muscle loss and protect their strength as they age.
- Get adequate protein: Protein stimulates muscle protein synthesis, the body’s repair mechanism that combats sarcopenia, the age-related loss of muscle mass and strength. Zemer recommends that individuals who regularly strength-train consume between 0.8 and 1 gram of protein per pound of body weight.
- Strength-train regularly: Lifting weights twice a week for 30 minutes may not always build new muscle, but Zemer points out that it provides enough stimulus to maintain existing muscle mass. Beginners can start with body-weight movements like squats, lunges, and push-ups, or incorporate farmer’s carries with weighted objects to improve grip and stability.
- Get sufficient sleep: Quality sleep ranging from seven to nine hours nightly supports physical maintenance. Zemer notes that while occasional short nights do not cause muscle damage, serious sleep deficiencies like consistently getting only five hours can trigger rapid muscle loss.
- Find workout alternatives during injury: Stopping all physical activity during an injury represents the worst possible approach. Zemer advises finding adaptable movements to maintain regular physical engagement even when dealing with joint pain.
Managing Muscle Loss While Taking GLP-1 Medications
The need for structured training and nutrition becomes even more acute for individuals using GLP-1 receptor agonists for weight reduction. Zemer explains that these drugs accelerate fat loss alongside lean muscle loss unless counteracted by targeted protein intake and resistance exercise.
“If you are on a GLP-1, just remember you’re accelerating the rate of fat loss, but you’re also accelerating the rate of lean muscle,” Zemer said. He emphasizes that patients must pair their treatments with proper training and diet to protect their physical strength.
Common Questions About Aging and Muscle Preservation
How much protein do I need if I lift weights?
Zemer recommends consuming 0.8 to 1 gram of protein per pound of body weight for individuals who regularly go to the gym and strength-train.
How often should adults strength-train to maintain muscle?
According to the U.S. Physical Activity Guidelines, adults should strength-train all major muscle groups at least two days per week.
Can GLP-1 medications cause muscle loss?
Yes. Fitness experts report that GLP-1 drugs accelerate weight loss, which includes a loss of lean muscle mass unless users incorporate strength training and adequate protein into their routines.
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