PSA: these drugs will eat your muscle too if you're not careful

[MedDad177]

Something I keep noticing with friends who look like they're wasting away, and it isn't negligence, they just were never told. Going on these meds without changing how you eat is risky. You eat less, so you get less of whatever added the weight, but also less protein, and protein is what holds your muscle in place. If you aren't deliberate about protein within a small calorie budget, you can lose a lot of muscle, sometimes enough to damage your health.

Lifting can't replace protein. Training breaks muscle down and the body rebuilds it stronger during recovery, using protein as the main fuel. In a protein deficit there's nothing to rebuild with, so lifting alone just makes it worse. Track your food in an app for a while because protein isn't intuitive until you build a sense of it. Honestly I think nobody should get a prescription without real nutrition counseling, not just a quick 'eat right'.

 

[zepfan_era17]

You said that without being super-intentional about protein in a limited calorie budget you'll lose big amounts of muscle. Meh, not for everyone. I'm a sedentary woman, so my starting muscle mass was low and I had little to lose. I've been on GLPs almost 4 years, lost 115 lbs and kept my muscle mass nearly intact. Also, picky eater here who dislikes most protein sources, lucky to reach 50 grams a day.

 

[paprika-stroller89]

Training under heavy calorie restriction from a GLP-1 calls for a different mindset. Adding strength or size is tough in that situation, except for absolute newcomers riding noob gains. For most people the realistic aim is holding onto muscle and telling your body to burn fat first. Thats probably even truer for you, returning to lifting after time away but presumably not brand new. Im down 41 pounds in six months, lifting heavy and consistently, and my definition is improving, though the bar hasnt gone up on my main lifts; a few 1RMs have even slipped slightly. A bit frustrating, but funnily, I appear more muscular since the fat is gone. I expect strength to return when I hit maintenance and switch focus to recomposition.

 

[roundtwo-ish]

People don't talk enough about muscle loss on these meds. With appetite that suppressed, you barely eat enough to keep muscle, never mind gaining any. And at that big a deficit your body can't tell fat from muscle, so plenty of folks land at a lower weight but less firm than hoped. Three lifting sessions weekly plus pushing protein down when nothing sounds good changes your final look massively. Think greek yogurt, cottage cheese, or a shake sipped over hours. Low volume, protein packed. That's the route to looking lean, not merely smaller.