More than you're probably getting, and it takes intention because the medication kills your appetite. Research on preserving muscle during weight loss generally supports 1.2 to 1.6 grams per kilogram of body weight a day, and for women over 40 I lean to the higher end. Lead every meal with protein and use a supplement to close the gap.
Protein is the thing I push hardest on with women starting a GLP-1, because it does two of the most important jobs at once: it protects your muscle while you're losing weight, and it keeps you from becoming undernourished on a shrunken appetite. The catch is that the very medication making weight loss easy makes eating enough protein genuinely hard.
What protein range does the research support?
Research on preserving lean mass during weight loss generally points to a range of 1.2 to 1.6 grams of protein per kilogram of body weight a day, and for women over 40 the higher end often makes sense. That is the clinical standard, not a personal prescription; your right number is a conversation with your clinician.
Research on preserving lean mass during weight loss generally points to a range of 1.2 to 1.6 grams of protein per kilogram of body weight per day. For women over 40, who are already contending with age-related muscle loss and the effects of declining estrogen, I lean toward the higher end of that range. I'm giving you the clinical standard here, not a personalized prescription, because your right number depends on your body, your activity, and your health history, which is a conversation for you and your clinician.
Why is protein so hard to get on a GLP-1?
Appetite suppression does not just make you eat less; it changes what you reach for. Protein-rich foods can feel heavy and unappealing when you are barely hungry, so they are often the first skipped in favor of a few crackers or fruit. That can leave you eating very little and almost no protein.
Appetite suppression doesn't just make you eat less, it changes what you reach for. Protein-rich foods can feel heavy and unappealing when you're barely hungry, so they're often the first to get skipped in favor of a few crackers or a bit of fruit. The result is that a woman can be eating very little and getting almost no protein, which is the worst-case scenario for holding onto muscle.
How do I actually get enough protein in?
Lead every meal with protein, deciding it first, which in practice often lands around 30 to 40 grams per meal, since whatever you eat first is what gets eaten. A quality supplement is often necessary; whey isolate is rich in leucine, the amino acid that signals muscle to rebuild. Collagen does not do that job.
The single most effective habit is leading every meal with protein, deciding it first, before anything else goes on the plate, which in practice often lands around 30 to 40 grams per meal. When appetite is limited, whatever you eat first is what actually gets eaten, so protein has to go first or it won't happen.
A quality protein supplement is often necessary rather than optional here, because closing the gap through food alone is tough on a small appetite. Whey isolate is my go-to, because it's rich in leucine, the amino acid that most directly signals muscle to rebuild. Collagen has its place for skin and joints, but it doesn't do this muscle-preserving job, so don't count it toward your protein target. A protein shake can be one of the easiest ways to get a real dose in when solid food feels like too much.
This article is education, not medical advice, and does not replace guidance from your prescriber. Medication, dosing, and hormone therapy decisions belong with a qualified clinician who knows your history.