GLP-1 diet plan: what to eat when your appetite is small

On GLP-1 medication, the most useful diet plan is a simple one: eat the protein part of each meal first, keep portions small and plain, and fit in vegetables, fruit and some fibre. You’re likely eating less, so each mouthful has more to do.

Updated 9 October 2026 · By the ParrotPal team

Key facts

There is no official GLP-1 diet. A 2025 joint advisory from four US nutrition and obesity societies puts protein, fibre-rich foods and strength training at the centre, and notes protein targets of 1.2 to 1.6 g per kg a day have been proposed during weight loss. In ParrotPal food diaries, 60.7% of members who told us they use GLP-1 medication logged under 1 g of protein per kg of body weight, against 42.1% of members who don’t.

What to eat on a GLP-1 diet

Three habits do most of the work. None of them needs special food or supplements.

• Protein first. Eat the protein part of your plate before the rest. If you only manage half a meal, make it that half. About 25 to 30 g a meal is a practical aim, or four smaller sittings.
• Small, plain portions. Many people find smaller, less greasy meals easier. A side plate helps.
• Keep the plants. Vegetables, fruit, beans and wholegrains are often the first thing pushed aside on a small appetite, and they bring the fibre.

Building a GLP-1 plate, smallest portion first

Eat first	Then	If there’s room
The protein: chicken, fish, eggs, tofu, beans, skyr, cottage cheese	Vegetables or fruit	Potatoes, rice, bread or pasta

A sample GLP-1 meal plan for one day

Here’s a day from our 7-day Mounjaro meal plan, which works for any GLP-1 medicine. The US versions use cups and US foods: Zepbound meal plan and Ozempic meal plan.

One protein-first day

Protein

• BreakfastSkyr (150 g) with berries and a spoonful of oats17 g
• LunchTin of tuna in spring water with light mayo on one slice of wholemeal toast, salad leaves30 g
• SnackGlass of semi-skimmed milk or a latte (300 ml)11 g
• DinnerChicken breast (100 g cooked) tray-baked with peppers and courgette, a few new potatoes32 g

About 90 g of protein across four small sittings. Approximate, from typical UK supermarket labels: check the packet.

How much protein on a GLP-1 diet?

There’s no single number. ParrotPal aims for about 1.6 g of protein per kg of a healthy weight for your height, which our protein calculator works out in seconds. Your prescriber or a dietitian can set a target that fits you.

In our members’ diaries, the typical member using GLP-1 medication logged about 79 g of protein a day, against 84 g for members who don’t. Protein made up the same share of calories in both groups, so the gap came from smaller days, not less protein-rich food. The full figures are in the GLP-1 protein gap.

Foods that make it harder

No food is banned. Some just take up room that protein could use: sugary drinks, alcohol, and big portions of crisps, biscuits or pastries. See foods to limit on Mounjaro for swaps, and what members using GLP-1 medication actually log. If a food makes you feel unwell, tell your prescriber.

Move as well as eat

Protein works best alongside two short strength sessions a week, made a little harder over time. Sit-to-stands and wall press-ups at home count. Why it matters: muscle loss on Mounjaro.

What the research says

• A 2025 joint advisory from four US nutrition and obesity societies notes that higher protein targets, such as 1.2–1.6 g per kg a day, have been proposed during active weight reduction (or an absolute 80–120 g a day), and that protein intake in adults should not fall below 0.4–0.5 g per kg a day.

  Mozaffarian D, Agarwal M, Aggarwal M, et al. (2025). 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. Obesity 33(8):1475–1503. doi:10.1002/oby.24336

• In the STEP 1 trial, body scans in a substudy found lean mass made up about 4 in every 10 kilos lost (5.3 kg of 13.6 kg). Lean mass includes muscle, organs and water.

  Wilding JPH, Batterham RL, Calanna S, et al. (2021). Once-weekly semaglutide in adults with overweight or obesity. New England Journal of Medicine 384(11):989–1002. doi:10.1056/NEJMoa2032183

• In a body-scan substudy of the SURMOUNT-1 trial (160 people), about 75% of the weight lost was fat and 25% lean mass, the same split as in the placebo group.

  Look M, Dunn JP, Kushner RF, et al. (2025). Body composition changes during weight reduction with tirzepatide in the SURMOUNT-1 study of adults with obesity or overweight. Diabetes, Obesity and Metabolism 27(5):2720–2729. doi:10.1111/dom.16275

Research describes the people who were studied. Where we quote our own members’ figures, they are what members logged, and the method is on our methodology page.

On GLP-1 medication? ParrotPal’s LeanShield score shows whether your day protects lean mass: protein, strength work and eating enough. 4.7★ on the App Store · iPhone. Get it on the App Store

Questions people ask

Related guides and data

• GLP-1 nutrition: all our guides and data
• 7-day Mounjaro meal plan
• Protein shakes on Mounjaro
• Gentle protein foods for low-appetite days
• Data: the GLP-1 protein gap