Protein shakes on a GLP-1: how to pick one and when they help

On a small appetite, a protein shake can carry part of your day when a plate feels like too much. This guide covers what to look for on the label, when a shake makes sense, and a simple one to make at home. It doesn’t name brands. Questions about your medicine or dose are for your prescriber.

Do you need protein shakes on a GLP-1?

No, but they can help on days when food is hard to face.

A 2025 joint advisory from four nutrition and obesity medicine groups (ACLM, ASN, OMA and TOS) puts protein-rich foods first: fish, eggs, Greek yogurt, cottage cheese, nuts and seeds. It adds that some people can meet their protein targets with high-protein shakes, bars and other fortified products. The same advisory notes that more protein alone likely isn’t enough to protect muscle. Strength activity matters too. See protecting muscle on a GLP-1 and the protein guide.

When does a shake beat a meal?

A shake is most useful when the choice is between a shake and eating nothing.

• Mornings when you can’t face food. The advisory says nausea often shows up in the morning or after long stretches without eating. It suggests breakfast and then small meals every 3 to 4 hours, with enough fluids.
• When you fill up fast. The advisory notes that thin liquids and foods with more water tend to leave the stomach faster than foods high in protein, fat or fiber.
• A busy gap. Between meetings or on the road, a shake beats a long stretch with no food at all.

On days you feel up to it, a small meal still brings more variety. See what to eat when you’re not hungry.

What should you check on a protein shake label?

Protein per serving, protein per 100 calories, added sugar, the sweeteners used and fiber.

Protein per serving

Look at the grams of protein in one serving, and check the serving size. Some containers hold two servings. If a shake stands in for a meal, you’ll want more protein than a snack-sized one gives.

Protein per 100 calories

Divide grams of protein by calories, then multiply by 100. A shake with 20 g protein and 160 kcal gives about 12.5 g per 100 calories. Around 10 g or more is a strong protein choice. That’s a practical rule of thumb, not an official cutoff.

Added sugar

The FDA sets the Daily Value for added sugars at 50 g a day. On the label, 5% DV or less of a nutrient per serving counts as low, and 20% DV or more counts as high.

Sweeteners ending in -ol

Some shakes use sugar alcohols such as sorbitol, mannitol, xylitol, erythritol or maltitol. The NIDDK lists sweeteners ending in “-ol” among things that can cause gas. A 2022 expert consensus on GLP-1 stomach side effects suggests avoiding them during diarrhea. Check the ingredients list if your stomach is sensitive.

Fiber

A little fiber helps with fullness and regularity. The advisory notes that high-fiber foods slow stomach emptying, and suggests avoiding fatty or high-fiber foods in the first few days when nausea is an issue. Go easy on shakes with a lot of added fiber if you’re already feeling full.

The label checker can walk through any label with you.

Do third-party seals mean a shake is safe?

No. A seal is a quality signal, not a guarantee of safety or an endorsement.

The NIH Office of Dietary Supplements says independent testing seals show a product was properly manufactured, contains what the label lists and doesn’t contain harmful levels of contaminants. It also says these seals don’t guarantee a product is safe or effective. Testing groups it names include NSF International, U.S. Pharmacopeia (USP) and ConsumerLab.com. Its sports supplement fact sheet describes NSF’s Certified for Sport program, which also checks for many banned substances.

The same office says supplements don’t need FDA approval before they go on sale. Tell your care team what you’re taking.

How do you make a protein shake at home?

Blend milk, plain Greek yogurt and a little fruit for about 26 g of protein.

These numbers come from USDA FoodData Central:

That’s about 11 g of protein per 100 calories. Some easy changes:

Make half if a full glass feels like a lot. Keep the rest in the fridge for later in the day.

How should you drink a shake on a GLP-1?

Slowly, in small sips, and stop when you feel full.

The 2022 expert consensus suggests eating slowly, stopping when you feel full and not drinking through a straw. It also suggests taking fluids in small sips, without drinking so much that you feel too full. A shake counts. Sipping it over a while is easier than finishing it in one go.

How does Imi help?

Imi fits shakes into the rest of your day instead of leaving them as an extra.

• Protein and water first. Your targets sit at the top of each day, so you can see what a shake covers.
• Quick logging. Log a shake by barcode, photo, text or voice.
• Gentler days. Log nausea and Imi plans lighter meals, or ask Imi to “make dinner gentler”.
• Your dose in one place. A dose log with an estimated level, injection site rotation and your supply.

Imi helps with food. Your prescriber handles your medication. For snack ideas, read high-protein snacks.