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Protein · Guide 4 of 9

Do I need protein shakes on a GLP-1 medication?

Review by a registered dietitian: pendingLast updated 1 min read

This guide is a draft. A registered dietitian reviews every guide before we publish it. How we write and review guides

Short answer

Not usually. Food can cover your protein if you eat small, protein-first meals. A shake helps on days when solid food is hard to face, or when you can't reach your range with food. Check the label for protein per serving and added sugar, look for an independent quality seal, and ask a clinician first if you have kidney disease.

Work out your range with the calculator
On this page

When food is enough

If you can eat small, protein-first meals, you may not need shakes at all. Lower-volume foods such as Greek yoghurt, eggs, fish and cottage cheese fit a lot of protein into small portions.[1] The calculator gives you a daily range to aim for.

When a shake helps

Some people reach their protein range more easily with shakes, bars or fortified foods.[1] They help most:

  • on days when solid food is hard to face
  • when you’re full after a few mouthfuls at most meals
  • as a quick option between meals, instead of skipping food

Smoothies made with milk or yoghurt can be more appealing than heavier foods on hard days.[1]

What to check on the label

  • Protein per serving. Compare it with your range for the day.
  • Added sugar. Some shakes have as much as a dessert.
  • Fibre and sweeteners. Large amounts of some sweeteners can upset the stomach.
  • An independent quality seal. In the US, the FDA doesn’t approve dietary supplements before they’re sold.[2] Seals from independent testers show a product contains what its label says and isn’t contaminated, but they don’t show it works or is safe for you.[3]

More protein than your body needs isn’t better: the joint advisory notes that excess protein can be stored as fat.[1]

Check with a clinician first if you

  • have kidney or liver disease
  • are pregnant or breastfeeding
  • have, or have had, an eating disorder
  • follow a diet set by a clinician

Get help now if you can't keep food or fluids down, have severe stomach pain, or feel faint. Contact your prescriber or urgent care today.

Frequently asked

Is a protein shake better than food?

No. Protein from a shake counts the same as protein from food, but food also brings fibre, vitamins and minerals. Use shakes to fill gaps, not to replace meals you can eat.

Can I make my own shake?

Yes. Milk or a soya drink blended with yoghurt and fruit gives protein without a powder. Some people find a cold drink easier than a warm meal on hard days.

Are protein bars the same?

They can fill a gap too. Many are high in sugar or sugar alcohols, which can upset some stomachs, so check the label and try one before relying on it.

Sources

Numbers match the citations above. To be checked by the reviewer.

  1. Mozaffarian D, Agarwal M, Aggarwal M, et al.. 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. Obesity Pillars, 2025.
  2. U.S. Food and Drug Administration. Questions and Answers on Dietary Supplements. FDA, accessed 3 October 2026.
  3. National Institutes of Health, Office of Dietary Supplements. Dietary Supplements: What You Need to Know. NIH, accessed 3 October 2026.