Food for Thought

Well, my goodness…it seems like every third conversation I have these days eventually circles back to Ozempic, Wegovy, Zepbound, or one of their cousins. One in eight Americans has now tried a GLP-1 medication.¹ I hear it from neighbors, other healthcare professionals and from my own extended family. And here’s the honest truth: as a nurse who has spent 30+ years in public health, I’m not here to wag my finger at anyone taking these medications. They are helping people. What I am here to do is make sure the people I love, and the people reading this newsletter, understand what’s happening inside their bodies while they’re on them, especially in two places that don’t get nearly enough airtime: the gut and the muscles.  

The Gut: More Than Just “Food Noise”

GLP-1 medications work in large part by slowing down how quickly food moves through your gut. That’s a big part of why people feel full faster and stop thinking about food all day long; patients often describe the constant “food noise” finally going quiet. But slowing gut transit also changes the environment your trillions of gut microbes live in, and that matters more than most people realize.

Researchers are now describing GLP-1 and the gut microbiome as a two-way street.² The medication reshapes which bacteria thrive, and in turn, your microbiome influences how well the medication works. And here’s the piece I really want you to hear: when people eat less overall on these drugs, fiber intake is often the first thing to drop.³ That’s a problem, because fiber is the fuel your gut bacteria need to produce the short-chain fatty acids that keep your gut lining strong, your inflammation low, and (believe it or not) your body’s own natural GLP-1 production humming along.⁴

A fascinating study published just this month took this even further. Researchers found that when gut microbes run short on fiber, some of them start breaking down the mucus lining that protects your intestinal wall instead, essentially eating your gut barrier from the inside. Indigestible plant proteins, the kind found in beans, grains, and vegetables, helped keep this from happening.⁵ Read that again. Your gut bacteria will eat your gut if you don’t feed them enough plants.

Animal research this spring showed something equally amazing: combining a GLP-1 medication with a high fiber diet protected against the microbiome disruption that so often shows up with these drugs, and even reduced the weight rebound that tends to happen after people stop taking them.⁶ Fiber isn’t just a nice-to-have here. It’s doing real and important work.

My take: if you or someone you love is on a GLP-1, this is exactly the moment to lean harder into beans, lentils, oats, berries, and vegetables, not lighter. Smaller meals mean every bite needs to work overtime.

The Muscles: The Part Nobody Warns You About

Here’s something else that surprised me. A large claims-data study of over 460,000 adults on GLP-1 medications found meaningful rates of both nutritional deficiencies and muscle loss during treatment.⁷ And just this June, researchers presenting at the Endocrine Society’s annual meeting reported some sobering findings: people on GLP-1 medications actually decreased their physical activity over time; daily steps dropped and so did minutes of moderate activity, with no evidence that losing weight naturally motivated people to move more.⁸ That’s the opposite of what protects muscle.

Now, before anyone panics, a widely discussed 2026 analysis made an important point that deserves to be said plainly: however you lose a significant amount of weight, whether through a GLP-1 medication or an old fashioned calorie-restricted diet, you are going to lose some muscle along with the fat.⁹ It’s not unique to these drugs. The real question isn’t “will I lose muscle,” it’s “how do I make sure most of what I lose is fat, and not the muscle I’ll need for the rest of my life?”

The science on the answer is remarkably consistent. Resistance training combined with adequate protein intake, generally in the range of 1.2 to 1.6 grams per kilogram of body weight daily, dramatically reduces the amount of lean mass lost on these medications.¹⁰ One trial combining a GLP-1 drug with a muscle-preserving compound brought the lean-mass share of total weight loss down from roughly 21% to just 7% when paired with the right nutrition and training approach.¹¹ Even without special compounds, strength training two to three times a week does remarkable work on its own.

My take: you do not need a gym membership or a barbell to protect your muscle here. Bodyweight squats, resistance bands, carrying your own groceries with intention; it all counts. What matters is doing it consistently, and making sure the protein on your plate is pulling its weight too.

Bringing It Home, the Whole-Food Plant-Based Way

I know some of you are wondering: can I hit those protein targets on a whole-food plant-based diet while also on a GLP-1? Absolutely. Lentils, tofu, tempeh, edamame, seitan, and beans are concentrated, satiating sources of protein that also happen to bring fiber along for the ride, a two-for-one that animal protein simply can’t offer. That combination may be exactly why plant proteins have been shown to produce gentler blood sugar responses than animal proteins do.¹² When your appetite is suppressed and every bite counts double, that fiber-and-protein package matters enormously.

So here is my real-life, practical advice for anyone in our community navigating a GLP-1 medication:

• Front-load fiber. Beans, lentils, oats, and vegetables at nearly every meal, not as a side thought, but as the main event.
• Eat fermented foods. Sauerkraut, kimchi, and plant-based yogurts help keep your microbiome diverse while your gut is already under new pressure.
• Move your body most days, with a real focus on resistance work, not just walking (though walking counts too — every bit helps).
• Spread your protein out across meals rather than saving it all for dinner, since your appetite may only allow for small portions at a time.
• Talk to your doctor or a registered dietitian about your individual needs, especially if you’re older or have a smaller frame, since muscle preservation matters even more for you.

These medications are a tool, not a replacement for the lifestyle habits so many of you have already worked hard to build. Food as medicine doesn’t stop mattering just because a prescription entered the picture; if anything, it matters more. Take care of your gut, protect your muscle, and keep leaning on the whole plant foods that have always had your back.

REFERENCES:

1. Pelc C. GLP-1 use may not lead to as much muscle loss as some experts feared. Medical News Today. Published May 1, 2026.
2. Kamath S, Chan NSL, Joyce P. GLP‐1 agonists and the gut microbiome: A bidirectional relationship. British Journal of Clinical Pharmacology. 2026;92(5):1309-1325.
3. The potential for complex interplay between GLP 1 receptor agonists, gut microbiome, and obesity management. ScienceDirect. Published April 8, 2026.
4. Dietary Fiber and Glucagon-Like Peptide-1 Receptor Agonists in Obesity Management: Converging Mechanisms, Interactions, and Strategies for Durable Weight Control. Advances in Nutrition. 2026.
5. AbuSalim JE, et al. Digestion-resistant proteins support the healthy metabolite profiles associated with plant-based diets. Proceedings of the National Academy of Sciences. 2026;123(32). Reported in: When gut microbes run low on fiber, they may start eating you. ScienceDaily. Published August 14, 2026.
6. GLP-1 RA-Exacerbated Gut Microbiome Dysbiosis in Obesity Mediates Post-Cessation Weight Regain. medRxiv. Published May 4, 2026.
7. Nutritional deficiencies and muscle loss in adults with type 2 diabetes using GLP-1 receptor agonists: A retrospective observational study. Obesity Pillars. 2025;15:100186.
8. Maharjan S, et al. Exercise decreases among people taking GLP-1 medication. Presented
   at ENDO 2026, Endocrine Society Annual Meeting. Published June 13, 2026.
9. No Need to Worry About GLP-1-Induced Muscle Loss. Medscape. Published May 1, 2026.
10. Muscle health in the modern era of incretin-based therapies. European Journal of Clinical Investigation. 2026;56(1):e70155.
11. GLP-1 Therapies in 2026: Beyond Blood Sugar and the Scale. AJMC. 2026.
12. Gut Microbiome-Associated Effects of Plant-Based Diets on Glucose Homeostasis, Body Composition, and Cognitive Function: A Scoping Review. ScienceDirect. Published February 22, 2026.

This article is for general educational purposes and is not a substitute for individualized medical advice. If you are taking or considering a GLP-1 medication, please talk with your healthcare provider or a registered dietitian about your specific nutrition and exercise needs.