Ozempic vs Mounjaro: what is the difference?
Ozempic and Mounjaro are the two names you hear most in weight loss right now. They are related, but they are not the same medication, and the difference matters.
Different drugs, different targets
- Ozempic (and Wegovy) is semaglutide. It mimics one gut hormone, GLP-1, which reduces appetite.
- Mounjaro (and Zepbound) is tirzepatide. It acts on two hormones, GLP-1 and GIP, which is why it tends to produce more weight loss in trials.
In head-to-head studies, tirzepatide generally leads to larger average weight loss than semaglutide. Both are prescription medications with side effects, and which one is right is a decision for you and your clinician.
Why the body-composition question is the same
Here is the part that does not change with the drug: fast weight loss takes muscle with it. Whether you lose 15 percent or 22 percent of your weight, a meaningful slice of that can be lean mass unless you protect it.
More weight lost is not automatically better if more of it is muscle. What you keep matters as much as what you lose.
Track what actually changes
Whichever medication you are on, watch your composition, not just the scale. Set a baseline with the body fat calculator and follow your lean mass in the muscle tracker.
This guide is general wellness information, not medical advice.
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