Semaglutide changes how much you eat more than what you eat. That makes the quality of each bite matter more. It also means side effects can decide your menu for a while.
Here is what the evidence and clinical guidance say about food on the drug. It covers what to favor, what to limit, and why protein keeps coming up.
How much less you are likely to eat
A 12-week crossover trial in 30 adults with obesity measured this directly [2]. They ate freely at lunch, dinner and snacks, on semaglutide 1.0 mg and on placebo.
−24%
Energy eaten across the day's free meals, semaglutide versus placebo
Blundell 2017
−5.0 kg
Mean weight change after 12 weeks on semaglutide
Blundell 2017
People also reported less hunger and fewer food cravings. They showed a lower preference for high-fat foods.
So if fatty food suddenly appeals less, that matches what the trial measured. You are eating less of everything, which is why the rest of this page is about getting enough.
What to favor and what to limit
In 2025, four clinical societies published a joint advisory on nutrition during GLP-1 treatment [1]. Its food lists are the most detailed guidance available.
| Encourage | Minimize or avoid |
|---|---|
| Fruit, such as berries, apples, citrus and bananas | Refined carbohydrates: processed grains, flours and added sugars |
| Vegetables, such as broccoli, leafy greens and carrots | Sugar-sweetened drinks |
| Whole grains, such as oats, quinoa and brown rice | Red and processed meats |
| Dairy, lean poultry, fish, seafood and eggs | Most fast food |
| Nuts, seeds and plant oils such as olive oil | Sweets and savory snacks |
The advisory also lists habits. It favors regular, small meals at set times and enough fluids, with minimal alcohol.
It advises against long gaps without food, large meals, and emotional or late-night eating. It even encourages portion-controlled treats, rather than a rigid list.
Alcohol and these drugs are covered in more detail in tirzepatide and alcohol, which also reviews the semaglutide studies.
Why protein keeps coming up
Weight lost on these drugs is not all fat. The advisory reports that in STEP 1, about 38% of the loss was lean mass [1].
The general adult protein allowance is 0.8 g per kg of body weight a day. The advisory notes that 1.2 to 1.6 g per kg has been proposed during active weight loss.
It adds a caveat. For people with obesity it is unclear which body weight those targets should use. As a simpler option, it suggests an absolute target of 80 to 120 g a day.
Eating protein first in a meal can help you get it in. The advisory points to low-volume sources such as fish, eggs, Greek yogurt, cottage cheese, nuts and nut butters.
Eating around side effects
Stomach side effects are common early. In the pooled STEP trials, 43.9% on semaglutide reported nausea against 16.1% on placebo [4]. Constipation affected 24.2% on the drug. Most cases were mild to moderate and passed.
For nausea, the advisory suggests a small breakfast, then small meals every 3 to 4 hours [1]. It notes that skipping food can make nausea worse.
A consensus paper on these side effects adds bland, low-fat food and avoiding sweet or spicy meals [3]. It suggests ginger, crackers or apples once 30 minutes have passed since the dose.
For diarrhea, the same paper suggests avoiding dairy, coffee, alcohol and sweeteners ending in “-ol,” such as sorbitol. For constipation, it suggests adequate fiber, more activity and plenty of water.
Constipation gets its own page: semaglutide constipation.
Getting enough on less food
Eating much less raises the risk of falling short on nutrients. The advisory suggests considering vitamin D, calcium, B12 or a multivitamin where you are at risk [1].
It also names smoothies, protein drinks, yogurt, cottage cheese and soups. These are often easier to face than heavy foods like red meat or hard cheese.
If eating enough is hard, the advisory suggests setting a reminder. Hair shedding with fast weight loss is covered in semaglutide hair loss.
What the evidence does not show
The Wegovy label pairs the drug with a reduced-calorie diet and more activity [5]. It does not name a diet.
No trial has compared keto, fasting or any other diet on semaglutide. The advisory’s lists come from general nutrition evidence and clinical experience. It says so itself.
For what the drug achieves on average, see how much weight you can lose on semaglutide. To match a goal to options, try the goal finder or the compounded semaglutide rankings.