How to Support Muscle Health on a GLP-1: A Complete Guide

When you start a GLP-1, the number on the scale gets all the attention. But what that number is made of matters just as much. Some of the weight lost when you eat less can come from muscle, and muscle is what keeps you strong, mobile and metabolically healthy as you age.

The good news: you have real control here. This guide covers the three foundations of supporting muscle health while you're eating less (protein, strength training and targeted nutritional support) and how to fit them into a simple daily routine.

Why muscle matters when you're eating less

GLP-1 medications work largely by reducing appetite. Research summarized by four leading obesity and nutrition organizations found that people on GLP-1s eat 16% to 39% fewer calories (joint advisory, 2025). Eating that much less changes more than your body fat.

In one large clinical trial of a GLP-1 medication, about 38% of the weight participants lost was lean body mass, which includes muscle along with other non-fat tissue. Because muscle makes up roughly half of lean mass, the advisory estimates that about 20% of the total weight lost was muscle.

That matters because muscle does far more than help you lift things. It supports balance, mobility, bone health and how your body uses energy. Muscle also naturally declines with age, and the advisory notes that people in perimenopause or menopause, and people who don't do strength training, are at higher risk of losing it during weight loss.

The takeaway isn't to fear the scale. It's to make sure the weight you lose is mostly fat, and that you keep the muscle you need for the decades ahead.

Foundation 1: Get enough protein

Protein provides the building blocks your muscles need, and it's the hardest thing to get enough of when your appetite is low.

The standard recommendation for adults is 0.8 grams of protein per kilogram of body weight per day. During active weight loss, experts have proposed higher targets of 1.2 to 1.6 g/kg per day. Because those numbers can be hard to calculate for larger bodies, the joint advisory also suggests a simpler range: about 80 to 120 grams of protein per day. Your doctor or a registered dietitian can help you set the right target for you.

Practical ways to get there when you're not very hungry:

• Eat protein first. Start each meal with the protein on your plate, before you get full.
• Choose small, protein-dense foods. Greek yogurt, cottage cheese, eggs, fish, tofu, and nuts or nut butters pack a lot of protein into small portions.
• Eat smaller meals more often. Several small meals can be easier than three large ones.
• Use shakes when you need them. A protein shake or smoothie can fill the gap on low-appetite days.

For a full breakdown, see our guide to protein on a GLP-1.

Foundation 2: Do strength training

This is the one people skip, and it's the one that matters most. The joint advisory is direct about it: more protein alone is likely not enough to support muscle without structured strength training. Aerobic exercise like walking is great for your heart, but on its own it does less to help you hold on to muscle while you're losing weight.

The advisory recommends strength training at least three times a week, plus at least 150 minutes of moderate aerobic activity, adjusted to your fitness level.

If you're new to it, start simple:

• Begin with bodyweight moves, such as squats to a chair, wall push-ups, glute bridges and step-ups.
• Add light resistance with bands or dumbbells as the moves get easier.
• Focus on big muscle groups: legs, hips, back, chest and core.
• Get help if you can. A trainer or physical therapist can build a plan that fits your body and keeps you safe.

Consistency matters more than intensity. Three short sessions a week, every week, will do more than one hard workout you dread.

Foundation 3: Add targeted nutritional support

Protein and strength training come first. Once those are in place, a few well-studied ingredients can add support, especially when you're eating less than usual.

HMB (β-hydroxy β-methylbutyrate). HMB is a compound your body makes in small amounts from leucine, an amino acid in protein. It supports muscle health and helps reduce muscle protein breakdown. It's one of the most researched nutritional ingredients, with more than 150 human studies over three decades (myHMB® research). In a 2026 randomized trial of 102 adults with obesity on a 12-week calorie-restricted diet, people who took a nutrition supplement containing HMB and protein maintained their skeletal muscle mass, while the control group lost some (study). Because that supplement also contained protein, the result reflects the formula as a whole.

Creatine monohydrate. Creatine is one of the most studied supplements in sports nutrition. The International Society of Sports Nutrition reports that it consistently raises muscle creatine stores and can improve exercise performance and training adaptations (ISSN position stand). That makes it a natural partner to strength training. Some people see the scale go up slightly when they start creatine. That's water drawn into the muscle, not fat.

Fiber and digestive support. Digestive changes, including constipation, are common when you eat less. The joint advisory recommends adequate fluids and fiber, increased gradually, and notes that ginger tea can help with nausea. A gentle soluble fiber such as PHGG (partially hydrolyzed guar gum) is easy to add to a drink.

Key vitamins. Eating less makes it harder to get enough of some nutrients. The advisory lists vitamin B12 among the nutrients to watch and suggests considering supplements for at-risk nutrients.

That's the thinking behind Seollae Protocol 01, a daily drink mix that combines myHMB®, creatine monohydrate, prebiotic fiber (PHGG), ginger extract and vitamin B12 in one packet. It's designed to work alongside protein and strength training, not replace them.

Putting it together: a simple daily routine

You don't need a complicated plan. A routine you can repeat is what works.

1. Morning: Start the day with a protein-rich breakfast, such as Greek yogurt or eggs, and your daily support drink.
2. Every meal: Eat your protein first, and aim to spread protein across the day instead of saving it for dinner.
3. Throughout the day: Drink water steadily, especially if you're adding fiber or creatine.
4. Three days a week: Do 20 to 40 minutes of strength training.
5. Most days: Add a walk or other movement you enjoy.
6. Every few months: Check in with your healthcare provider. If you can, track your body composition with a DEXA scan or body composition scale, not just your weight.

Frequently asked questions

Do you lose muscle on a GLP-1? Some of the weight lost on a GLP-1 can come from lean mass, including muscle. In one large clinical trial, about 38% of weight lost was lean mass, and an estimated 20% was muscle. Eating enough protein and doing regular strength training are the best-supported ways to help keep it.

How much protein should you eat on a GLP-1? Experts have proposed 1.2 to 1.6 grams of protein per kilogram of body weight per day during active weight loss, or a simpler target of about 80 to 120 grams per day. Ask your doctor or a registered dietitian to set the right target for you.

Can you take creatine and HMB on a GLP-1? Creatine and HMB are both widely studied supplements that support muscle and strength, and they are often taken together. Talk to your healthcare provider before adding any supplement to your routine while on a GLP-1.

Is walking enough to keep muscle on a GLP-1? Walking is great for overall health, but on its own it does less to help you keep muscle during weight loss. Experts recommend strength training at least three times a week, plus regular aerobic activity like walking.

Sources

• Nutritional priorities to support GLP-1 therapy for obesity: a joint advisory from ACLM, ASN, OMA and The Obesity Society, Obesity, 2025
• Calcium HMB-enriched nutritional supplementation during dietary weight loss in adults with obesity: a randomized controlled trial, 2026
• International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation, 2017
• myHMB® science and clinical research

This article is for general information only and is not medical advice. Talk to your healthcare provider before starting any supplement, especially if you take medication or have a medical condition.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.