Guide · Food
Protein on low-appetite days: getting enough on a GLP-1
When a few bites fill you up, what you eat first matters. Here’s why protein deserves those bites, how much is commonly recommended, and easy ways to get it in.
The short answer
Part of the weight lost on a GLP-1 is lean mass, including muscle, and low appetite makes it easy to fall short on protein.1 Common targets are 1.2 to 1.6 grams per kilogram a day during weight loss, or a simpler 80 to 120 grams a day.1 Eat protein first, choose small protein-dense foods, use a shake when meals won’t happen, and pair it with strength training.1
Why protein matters on a GLP-1
Losing weight means losing some lean mass along with fat. In the STEP 1 trial of semaglutide, about 38% of the weight people lost was lean body mass, which includes muscle. The advisory estimates roughly a fifth of the total loss was muscle.1
Muscle keeps you strong and steady on your feet, and losing too much affects how you feel and function. Low protein from a smaller appetite can add to muscle loss, especially with older age, menopause, sitting most of the day, or no strength training.1
How much protein
There’s no single agreed number yet. The 2025 joint advisory from four obesity and nutrition societies lays out the options:1
- General adult allowance
- 0.8 grams per kilogram of body weight a day (0.36 g per pound)
- Proposed during weight loss
- 1.2 to 1.6 g/kg a day
- A simpler target
- 80 to 120 grams a day, which may be easier to stick with
- Don’t go below
- 0.4 to 0.5 g/kg a day
- Avoid long term
- 2 g/kg a day or more
With a higher body weight, targets based on actual weight can overestimate how much you need, which is one reason the fixed 80 to 120 gram target exists.1 With Aven’s protein calculator by text, you text your weight and meals, and Aven keeps count. If you have kidney disease or were told to limit protein, ask your care team first.
Getting it in when you’re barely hungry
These ideas come from the advisory.1 Pick the ones that suit your kitchen and your stomach.
Eat the protein first
If you can only finish half your plate, make it the half with the chicken, fish, eggs, or beans.
Choose small, dense foods
Greek yogurt, cottage cheese, eggs, fish, and nuts or nut butter pack protein into small portions.
Drink it when chewing is too much
A protein shake or smoothie can cover a meal you can’t face. Protein bars and fortified foods help too.
Spread it through the day
Small meals every few hours make the daily total more reachable than two big ones.
Lean on a mix of sources
Beans, peas, lentils, dairy, seafood, eggs, and poultry are all encouraged. Red and processed meats are best kept moderate.
Set a reminder to eat
When hunger doesn’t remind you, a text can. It’s easy to go most of a day on very little.
On queasy days, softer options like yogurt, soups, and smoothies are often easier. Our guide to nausea days on a GLP-1 has more, and your first week on a GLP-1 covers how to set up the habit early.
Protein math, by text
Aven does the adding up for you. Text what you ate, and Aven tells you roughly where you are and what’s left. Food amounts are estimates.
Aven- Wednesday 3:10 PM
- Had Greek yogurt and half a turkey sandwich. Not hungry at all. How’s my protein?
- Nice start: that’s roughly 30 to 35 grams. You’re aiming for about 90 today, so 55 or so to go. A shake this afternoon would cover a big chunk without a full meal.
- I have one in the fridge
- Perfect. Then dinner only needs a small piece of fish or chicken. Want a nudge at 6?
- 6:00 PM
- Dinner nudge 🙂 Protein first, even if it’s just a few bites.
Protein needs a partner: strength training
Eating more protein alone is likely not enough to keep muscle. The advisory recommends strength training at least 3 times a week, plus at least 150 minutes of moderate aerobic activity, adjusted to your fitness.1 It doesn’t need a gym: bodyweight moves, resistance bands, or carrying groceries all count as a start. Strength work also helps when the scale stalls.
What Aven does, and doesn’t do
Aven does
- Estimate the protein in what you ate
- Tell you what’s left for the day
- Send reminders to eat, just by asking
- Help you build strength days into your week
Aven doesn’t
- Set a medical diet for a health condition
- Change your medication or dose
- Replace a dietitian or your care team
Questions people ask
How much protein do I need on a GLP-1?
There isn’t one agreed number. A 2025 joint advisory notes the general adult allowance is 0.8 grams per kilogram of body weight a day, that 1.2 to 1.6 g/kg has been proposed during active weight loss, and that a simple target of 80 to 120 grams a day is an alternative that may be easier to stick with.1 Ask your care team what fits you. With Aven’s protein calculator by text, you text your weight and what you eat, and Aven does the math.
What are easy high-protein foods when I’m not hungry?
Smaller, protein-dense foods are easiest: fish, eggs, Greek yogurt, cottage cheese, and nuts, seeds, or nut butters. Protein shakes and bars can help fill the gap.1 On queasy days, smoothies, protein drinks, yogurt, and soups often sit better than heavy meals.
Is protein enough to keep muscle on a GLP-1?
Probably not by itself. The advisory says more protein alone is likely not enough to preserve muscle without structured strength training, and recommends strength training at least 3 times a week plus at least 150 minutes of moderate aerobic activity.1
Can I eat too much protein?
The advisory says intake at or above 2 g/kg a day for a long time should be avoided, and that intake shouldn’t fall below 0.4 to 0.5 g/kg a day.1 If you have kidney disease or were told to limit protein, check with your care team before changing how much you eat.
Sources
- Mozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367. doi:10.1016/j.ajcnut.2025.04.023
This guide is general education, not medical advice. Research is cited as background on GLP-1 treatment, not as evidence about Aven. Aven is not affiliated with Novo Nordisk, Eli Lilly, or any drug manufacturer.