Myths and facts about GLP-1

Does alcohol change anything?

What people say: On these medicines, drinking is the same as always.

Myth

Not quite. Alcohol can make nausea and reflux worse, and the guidance is to keep it to a minimum. Drinking a lot is one of the most common causes of pancreatitis; strong belly pain that doesn't go away is in Help, under when to get care. If you use insulin or a sulfonylurea, drinking a lot, especially without food, can bring on low blood sugar. Some users say they drink less on these medicines, and small studies are looking at this, but they aren't an approved treatment for drinking problems.

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Should strength training wait?

What people say: I'll start lifting weights after I've lost the weight.

Myth

Guidelines recommend strength training while you lose weight, not after: two to three times a week or more. In a Danish trial with liraglutide, people on the medicine alone lost more bone density at the hip and spine than those who exercised, and their fitness didn't improve, while it did in the exercise groups. You can start light, at level 1, and build from there.

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Is regain after stopping your fault?

What people say: If the weight comes back after I stop, it's my fault.

Myth

It's physiology, not weakness. In a 2026 review, about two thirds of the weight lost with semaglutide or tirzepatide came back within a year of stopping, on average. Staying active and keeping your habits is the best bet we know of, with no guarantee. The decision to stop is one to make with your doctor.

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Is more protein always better?

What people say: When it comes to protein, the more the better.

Myth

Not quite. Guidelines for people on these medicines give a range, not a single number, and there's no agreement on which body weight to base it on. They also advise against staying at very high intakes for a long time. With kidney disease, the advice is lower, not higher. Your target is yours, or your doctor's or dietitian's, and the guideline reference is in the Strength tab.

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Do results with medication count?

What people say: Losing weight with medication doesn't really count.

Myth

It counts. Brazil's 2026 obesity medication guideline describes obesity as a chronic disease and recommends medication together with lifestyle changes. And the medicine doesn't do all the work: in one trial, exercise plus the medicine kept the weight off better than either one alone; in a small six-week study with men, training built strength and the medicine added nothing to it. The training, the protein and the routine are yours. That's physiology, not weakness.

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No nausea, no effect?

What people say: If I don't feel sick, the medication isn't working.

Myth

Feeling sick isn't a sign that it's working. In the semaglutide trials, stomach symptoms explained only a tiny part of the weight loss, and nausea doesn't predict who loses more. In some studies, men also reported nausea less often than women. How you feel is worth noting for your next appointment, nausea or not.

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Can you skip meals when you aren't hungry?

What people say: If I'm not hungry, I can skip meals and eat once at night.

Myth

Eating less is expected with these medicines. Skipping meals and then eating one big one is different: the guidance is small meals at regular times, with protein, and vomiting is more likely after large meals. When hunger is low, a small portion with protein already counts. The low-appetite recipes have ideas.

Sources

Mozaffarian D et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from ACLM, ASN, OMA and The Obesity Society. Obesity 2025;33(8):1475-1503.

Is protein enough to keep muscle?

What people say: If I eat enough protein, I don't need to train to keep my muscle.

Myth

Protein helps, but on its own it's probably not enough. Part of the weight lost is lean mass, which includes muscle, and guidelines pair protein at every meal with strength training. In a study of weight loss by eating less, without an exercise program, men were estimated to lose close to twice as much muscle as women for each kilo lost. Strength and protein work as a pair.