Life on a GLP-1: eating, exercise and injections

What should I eat on a GLP-1?

Smaller meals with protein first. You will eat less, so each bite needs to count for protein, fiber and fluids.

A 2025 advisory from four US nutrition and obesity groups proposes 1.2–1.6 g of protein per kg of body weight a day during weight loss.¹ The everyday minimum for adults is 0.8 g per kg.¹

For a 200 lb (91 kg) person, that works out to about 109–145 g a day.¹ But using your full body weight can overestimate what you need.¹ So the same advisory offers a simpler goal: 80–120 g a day.¹ It also warns against staying at 2 g per kg or more for long.¹ If you have kidney disease, ask your doctor before eating more protein.

Eating the protein part of your plate first helps you finish it before you feel full.¹ The advisory favors beans and lentils, dairy, fish, eggs and chicken. It suggests keeping red and processed meat low.¹

Protein in everyday US foods

We worked out each serving from the USDA's FoodData Central (its standard reference foods).² Each line says whether the food is weighed raw, cooked or from a can.

Source: USDA FoodData Central, SR Legacy, protein per 100 g, multiplied up to each serving and rounded to whole grams.²

A worked example: 3 oz of roasted chicken breast, ¾ cup of plain nonfat Greek yogurt and ½ cup of black beans add up to about 51 g of protein.² That is well over half of the 80 g goal.

Smaller meals, fiber and fluids

• Small meals. Vomiting is more likely after a large meal.¹
• If you feel sick: try a small breakfast, then small meals every 3–4 hours.¹
• Fiber, slowly. Go easy on high-fiber food in the first few days. After that, add fiber gradually to prevent constipation.¹
• Fluids. Losing fluids through vomiting or diarrhea can harm your kidneys.^1,3 The advisory says to drink enough fluids.¹ For alcohol, see Questions people ask.

How do I keep my muscle?

Do strength exercise at least 3 times a week, and eat enough protein. Walking alone protects less muscle than walking plus strength training.¹

Not all the weight you lose is fat. In one semaglutide trial, of every 10 lb lost, about 4 lb was "lean mass": muscle and other non-fat tissue. About 2 lb of that was muscle.¹

The 2025 advisory suggests strength training at least 3 times a week, plus at least 150 minutes of moderate activity, like brisk walking.¹ The plan should match your fitness level.¹

What about Thanksgiving, Ramadan and other fasts?

Big meals make vomiting more likely, so take small plates and stop early.¹ Fasting needs a plan, especially if you take insulin or a sulfonylurea (an older type of diabetes pill).^3,10

Thanksgiving, holidays, game days and parties

Thanksgiving dinner, holiday parties, tailgates, weddings, Eid and other feast days all follow the same rules:¹

• Small portions, eaten slowly, with the protein first.¹
• Fewer rich, fried and sweet dishes.¹
• Keep alcohol to a minimum.¹
• You don't have to finish what you're served, or have a second helping to be polite.

If your injection day lands on a big day and you'd rather move it, you can: the Zepbound label allows a new day as long as there are at least 3 days between two doses, and the Ozempic label at least 2 days.^4,5

Ramadan

The main international guidance is the 2021 Ramadan guidelines from the International Diabetes Federation and the Diabetes and Ramadan International Alliance (IDF-DAR).^10,11

• GLP‑1 medicines can be used while fasting, if taken on schedule with a doctor's oversight.^10,11 Don't stop without medical advice.¹⁰
• Finish dose increases first. Pharmacy advice published in the UK in 2026 suggests completing them at least 4 to 6 weeks before a planned fast, and putting off the next increase if the fast starts soon.¹²
• Weekly injections stay on the same day each week. Some people inject after iftar to limit nausea, others after suhoor to stay full through the day.¹²
• The Wegovy pill needs an empty stomach and a 30-minute wait before eating, so it fits best on waking for suhoor.^3,12
• Watch for constipation and dehydration. Fasting raises the risk of these. Fill the eating window with whole grains, beans and lentils, fruit, vegetables and enough fluids.¹²
• The research is mostly on older GLP‑1 medicines (liraglutide, lixisenatide and exenatide). The 2021 guidelines don't name semaglutide or tirzepatide, and say more research is needed.¹¹

Other fasts

We found no US guidance written for GLP‑1 users during other religious fasts, such as Yom Kippur or Lent. The same practical advice applies to any planned fast: finish dose increases weeks before, and plan your fluids.¹²

How do I inject, and what if I miss a dose?

Inject once a week, on the same day, into your belly, thigh or upper arm. Use a new needle and a new spot each time.

• Where: just under the skin of the belly, thigh or upper arm.^3,4 For Zepbound, the back of the upper arm is for someone else to inject.⁴
• When: any time of day, with or without food.^3,4
• Rotate: use a different spot each week.^3,4
• Vials: if you use Zepbound vials, your pharmacist or prescriber should show you how to draw up the dose with a syringe.⁴
• Never share a pen, even with a new needle. It can spread serious infection.³

Getting rid of needles and pens

• Use an FDA-cleared sharps container, right away after each injection. If you don't have one, the Wegovy instructions allow a heavy-duty plastic household container with a tight, puncture-resistant lid, labeled as hazardous waste.³
• When it's almost full, follow your community's rules. Options include drop-off sites, household hazardous waste sites, mail-back programs and special pickup; they vary by state.⁹
• Never put needles or pens loose in the household trash. Don't reuse or overfill a sharps container. For your state's rules, call Safe Needle Disposal on 1-800-643-1643.^3,9

Missed a dose?

Never take two doses to catch up. For Ozempic the window is 5 days.⁵ If you miss 2 or more Wegovy doses in a row, the label says to restart at a lower dose and step up again, to lower the risk of stomach side effects. Ask your prescriber which dose to restart on.³

On pills?

• Wegovy pill: take one each morning on an empty stomach, swallowed whole with up to 4 oz (120 ml) of plain water. Then wait at least 30 minutes before eating, drinking or taking other pills. If you miss a day, skip it and take the next one the following day.³
• Rybelsus (for type 2 diabetes) is also taken on an empty stomach, followed by a 30-minute wait.⁶
• Foundayo (orforglipron) is taken once a day, with or without food. If you miss a dose, take it as soon as you can, but don't double up.⁷

How do I store it, and travel with it?

Keep unopened pens in the fridge. Many can sit outside the fridge for a while, but only at or below 86°F (30°C).

Store new pens at 36–46°F (2–8°C). Never freeze them, and never use one that has frozen.^3,4 Keep them in the carton or with the cap on, to protect them from light.³

From the US prescribing information. Always follow the Medication Guide in your own pack.

Flying. The TSA allows unused syringes when they're with injectable medicine; declare them to the officers at the checkpoint. It recommends, but doesn't require, that medicines are labeled.¹³ Keep pens in your carry-on, with your prescription, and remember a pen must never freeze, so don't let it touch a frozen ice pack.³

How do I know if it's working?

Expect regular check-ins with your prescriber. US labels for Wegovy and Zepbound don't set a fixed cut-off; your prescriber weighs your response and how well you tolerate it.^3,4

1. Week 0Start on a low dose. Write down your weight and waist.
2. Every 4 weeksThe dose usually steps up, if side effects allow. If you don't tolerate a step, the next one can wait 4 weeks.^3,4
3. At the full doseYour prescriber and you decide on the dose to stay on, based on how it's working and how you feel.^3,4
4. After thatRegular reviews, for as long as you take it.

For a 200 lb (91 kg) person, 5% is 10 lb (4.5 kg). Falling short doesn't mean you failed. Your doctor weighs up the benefits and risks of carrying on. Guide 3 covers the other options.

On the older daily medicine liraglutide (Saxenda), the label is stricter: stop if you haven't lost at least 4% of your starting weight after 16 weeks.⁸ And none of these medicines replaces diet and exercise: the labels approve them alongside a reduced-calorie diet and more physical activity.^3,4

What should I keep track of?

Your weight, waist and side effects, and your sugar if you have diabetes. Bring the notes to each review.

• Weight and waist: write them down, so you can compare at your reviews. Guide 1 shows how to measure your waist.
• Blood sugar, if you have diabetes: check before you start and while you take it.³ Low sugar can show as dizziness, sweating, shaking, blurred vision, confusion or a fast heartbeat.³
• Doctor checks: your heart rate, because your resting pulse can rise on these medicines. Tell your doctor if your heart races while you are resting.³ Kidney tests if you've had bad vomiting or diarrhea.³ If you have diabetes, report any change in your eyesight.³
• Side effects and meals: note what you ate before nausea. Patterns help.
• Report side effects to the FDA's MedWatch program, online or at 1-800-FDA-1088. Anyone can report.¹⁴

What about food noise and family meals?

Many people find the constant thoughts about food go quiet. Some also lose the pleasure of eating, and that can feel strange at family meals.

Studies show less "food noise", less emotional eating and fewer binges on these medicines.¹ But some people miss the joy of food, or of cooking for others.¹ If food has always been how your family shows care, that change can be hard. Talking it through, or seeing a counselor, can help.¹

Don't skip meals for hours because you aren't hungry. Getting very hungry can bring back cravings for sweets and refined carbs.¹

At home, it helps if the people you eat with know why your plate is smaller. A simple line works: "I'm on a medicine that fills me up fast. I'll have a little of everything."

Questions people ask