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Eating

Eating when you have no appetite

For a lot of people the surprise is not being less hungry — it is forgetting to eat at all, then feeling terrible at four in the afternoon. On a GLP-1, eating becomes something you plan rather than something your stomach reminds you to do.

By the Cafeity teamUpdated 3 min read

The short answer

GLP-1 medicines reduce calorie intake by affecting appetite, so on low-appetite days the priority shifts to eating enough of what matters.1 The 2025 joint advisory suggests eating breakfast and then something small every three to four hours, rather than waiting for hunger, with protein first and nutrient-dense foods.2 Drinks and soft foods — milk, yoghurt, soups, smoothies, protein shakes — often go down when meals will not. If you cannot eat or drink for a day or more, or keep fluids down, contact your prescriber.

Why appetite disappears

That is the medicine working: the labels describe semaglutide and tirzepatide as reducing calorie intake, likely by affecting appetite, through GLP-1 receptors in the brain regions that regulate it.13 Slower stomach emptying adds a lingering fullness. On a weekly injection, many people find appetite lowest in the day or two after the dose.

Eat by the clock, not by hunger

The joint advisory suggests breakfast and then small meals every three to four hours to avoid a cycle of not eating and feeling worse.2 Setting two or three meal times — and a reminder — replaces a hunger cue that is no longer reliable.

Foods that go down on low days

Protein per portion from USDA FoodData Central. Portions are typical servings, not recommendations.
Easy optionWhy it worksProtein per portion
Greek yoghurt, plain, non-fat (170 g pot)Cold, soft, no cookingabout 17.5 g
Cottage cheese, 2% (½ cup)Small volume, high proteinabout 12.4 g
Eggs (1 large, hard-boiled)Keep a few ready in the fridgeabout 6.3 g
Milk, skimmed (1 cup)Drinkableabout 8.3 g
Tofu, firm (½ cup)Soft, takes any flavourabout 21.8 g
Lentil or bean soupProtein and fibre, easy to sipabout 9 g per ½ cup of lentils

Source: USDA FoodData Central.4 Protein drinks and shakes are another option; check the label for protein and sugar.

When too little becomes a problem

The joint advisory warns that very low intakes — below about 1,200 kcal a day for women and 1,800 for men — make nutrient shortfalls more likely, and that protein should not fall below about 0.4–0.5 g per kg a day.2 The labels add that substantial or rapid weight loss can increase the risk of gallstones.1 If your intake has dropped a long way, or you feel weak, dizzy or unwell, tell your prescriber; it is a common reason to review treatment.

When to contact your prescriber

Keeping a record of it

Cafeity shows protein, fibre and water against their reference figures on the Today screen, so a low day is visible by lunchtime rather than at bedtime — and quick-add means a protein shake is one tap.

Cafeity Today screen: day 1 of 7 since the last dose with the estimated level at 97% of peak, fibre 21 of 25 g, protein 110 of 100 g, steps, water 850 ml of 2.4 L, the next logged dose and the weight trend.
Protein, fibre and water at a glance.
Cafeity calories and macros screen: 284 of 2,550 kcal, protein 71 of 170 g, carbohydrate and fat, with steps and a how-you-feel mood check-in below.
What you have eaten so far.

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Common questions

What should I eat on a GLP-1 when I am not hungry?
Small, protein-first portions on a schedule — the advisory suggests breakfast then something every three to four hours — with soft foods and drinks when meals will not go down.2
Is it bad to skip meals on a GLP-1?
Regularly going without food risks too little protein and nutrients; the advisory suggests regular small meals to avoid a cycle of not eating.2

Sources

  1. Semaglutide injection and tablets for weight management — US prescribing information DailyMed, US National Library of Medicine, version published 30 June 2026
  2. 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 Mozaffarian D et al. 2025 (published in four journals)
  3. Tirzepatide injection for weight management and obstructive sleep apnoea — US prescribing information DailyMed, US National Library of Medicine, version published 2 September 2026
  4. FoodData Central US Department of Agriculture, Agricultural Research Service

Written by the Cafeity team from the sources listed here. Figures from prescribing information are quoted as the label states them; trial results are averages from those trials, not predictions for any one person. This page has not yet been reviewed by a clinician — see the editorial policy for how pages are researched and corrected.