What to Eat (& Why) on a GLP-1

If you've started a GLP-1 medication like Ozempic, Wegovy, Mounjaro, or Zepbound, you've probably noticed something strange: you barely think about food anymore. That's the point. But here's what nobody tells you, eating less doesn't automatically mean eating well, and the difference will shape your results for years.

GLP-1 medications work by slowing how fast your stomach empties and turning down hunger signals in your brain. Genius, in a lot of ways. But that same mechanism means whatever you do eat has to do a lot of work, because there's much less of it going in.

I've spent my career working with people on these medications, and the conversations I have most often have nothing to do with willpower or restriction. They're about how to actually fuel a body that's losing weight quickly, often on 800 to 1,200 calories a day. So let's get into it, what to eat, what to skip, and the science behind why it matters.

Part OneWhy food matters more, not less

It feels counterintuitive. The medication is doing the work. You're not hungry. So why obsess over what's on the plate?

Because when you're eating dramatically less, every bite has to count. There is no room for empty calories, no room for skipping protein because you're "not hungry," no room for the smoothie-and-chips approach to eating. Body composition studies on GLP-1 users have repeatedly shown that a substantial portion of weight lost, sometimes 25 to 40%, comes from lean tissue when patients aren't actively eating to protect it. That's muscle, bone density, water. Not just fat.

The scale might still move beautifully. But you can finish six months on a GLP-1 weaker, more fragile, more metabolically sluggish, and with thinner hair than when you started. Or, with intention, you can come out the other side leaner, stronger, and more functional than you've been in years. The difference is almost entirely on the plate.

Part TwoThe protein priority

If you remember nothing else from this article, remember this one rule: protein is non-negotiable on a GLP-1. It's the single most important macronutrient when you're on these medications, and almost everyone underestimates how much they need.

Why your body needs more, not less

Protein protects muscle during rapid weight loss. It keeps your metabolism from tanking. It promotes satiety so the medication's appetite-suppressing effect lasts longer through the day. It supports skin elasticity, hair, nails, and immune function. When intake drops, every one of those systems starts pulling from the same emergency fund, your lean tissue.

How much, in real numbers

Current evidence supports 1.0 to 1.6 grams of protein per kilogram of body weight per day for adults on GLP-1 medications, substantially more than the old RDA of 0.8 g/kg, which was set for sedentary adults at a stable weight. For a 180-pound (82 kg) person, that translates to roughly 80 to 130 grams of protein per day. For most of my patients, that means consciously hitting 25 to 35 grams at every meal.

What to actually eat

• EggsWhole eggs, not just whites. The yolk has half the protein, choline, and most of the vitamins.
• Greek yogurt & cottage cheesePlain, 2% or full-fat. Skyr is even higher in protein per spoonful.
• Chicken, turkey, lean beefRoasted, grilled, or slow-cooked. Skip breaded and fried.
• Fish, especially fatty fishSalmon, sardines, mackerel, tuna. Bonus omega-3s for inflammation and brain health.
• Tofu, tempeh, edamamePlant-forward protein with complete amino acid profiles.
• Beans & lentilsSlower to digest, often easier on a sensitive GLP-1 stomach than red meat.
• Protein powderWhey isolate or a quality plant blend. A scoop in coffee, oats, or yogurt is the easiest way to hit your target.

Part ThreeThe silent saboteur: hydration

GLP-1 medications reduce thirst cues the same way they reduce hunger cues. This means a large percentage of people on these meds are walking around mildly dehydrated and don't realize it, until they hit a wall of fatigue, constipation, headaches, and brain fog and can't figure out why.

Aim for at least 64 ounces of water per day, with 80 to 100 ounces being optimal for most adults, and even higher if you're active or living somewhere hot (looking at you, Texas). Hydration is what keeps your kidneys happy during rapid weight loss, prevents the GLP-1 constipation that tortures so many patients, and quietly cuts down nausea.

Part FourFiber: your digestive best friend

The number two complaint I hear from GLP-1 patients (after nausea) is constipation. The fix isn't a daily laxative, it's fiber, paired with that hydration we just talked about.

Aim for 25 to 35 grams of fiber per day, ideally from food. Beyond keeping things moving, fiber slows glucose absorption, feeds the gut microbiome, and adds satiety to the smaller volumes you're eating. The combination of food-based fiber and adequate water is the single most effective intervention for GLP-1-related constipation in clinical practice.

• BerriesRaspberries are the fiber champion at 8g per cup. Blackberries are close behind.
• Chia seedsAbout 10g per ounce. Stir into yogurt, oats, or water with lemon.
• Avocado10g of fiber and healthy fats in a single fruit.
• Lentils, black beans, chickpeasDouble duty, protein and fiber in one ingredient.
• Oats, oat bran, ground flaxseedSoluble fiber that's especially gentle on a sensitive stomach.
• Pears, apples (with skin), kiwiWhole fruits give you more fiber than juice ever can.
• Cruciferous vegetablesBroccoli, Brussels sprouts, artichokes, cauliflower.

Part FiveSmart fats in modest amounts

Healthy fats keep you satisfied, support hormones, and help your body absorb fat-soluble vitamins (A, D, E, K). They belong on the plate. But here's the catch specific to GLP-1s: high-fat meals slow gastric emptying even more, which can intensify nausea, reflux, and that miserable "brick-in-my-stomach" feeling that drives people off these medications.

The move is moderate amounts of high-quality fat at each meal, not zero, not heaps. A thumb-sized portion. A drizzle. A quarter avocado, not the whole one. A small handful of nuts, not a bowl. Olive oil, fatty fish, eggs, seeds, and avocado are your go-tos. Fried foods and heavy cream sauces are not.

Part SixThe "limit" list

I don't believe in forbidden foods. I do believe in foods that will make your GLP-1 experience meaningfully worse, and you deserve to know which ones.

Part SevenThe GLP-1 plate method

If all of this feels like a lot to track, here's the framework I give every patient on day one. At every meal, picture your plate in three sections:

1. Half the plate: lean proteinChicken, fish, eggs, tofu, Greek yogurt, beans, lentils, or a combination. This is where most of your calories and most of your "work" should come from.
2. One-quarter: non-starchy vegetablesLeafy greens, broccoli, cauliflower, peppers, cucumbers, zucchini, asparagus, tomatoes. Volume, fiber, vitamins.
3. One-quarter: smart carbohydratesQuinoa, sweet potato, beans, whole-grain bread or rice, fruit. Energy and additional fiber.

Then add a thumb-sized portion of healthy fat, a tablespoon of olive oil, a quarter avocado, a small handful of nuts or seeds. Eat your protein first. Eat slowly. Stop when you feel comfortable, not full. On a GLP-1, full comes about 20 minutes after comfortable, and by then you've overeaten and you'll feel it for hours.

Part EightThe mistakes I see most often

After years of working with patients on these medications, the same handful of patterns come up over and over. If any of these sound familiar, you're not failing, you're just missing one or two pieces.

• Skipping meals entirely because "I'm not hungry"Hunger isn't a reliable signal on a GLP-1. Schedule your eating like you schedule your medication. Set alarms if you have to.
• Going liquid because it feels easierSmoothies, shakes, and broths can become a crutch that leaves you under-protein, under-fiber, and losing muscle.
• Forgetting protein at breakfastThe most-skipped meal and the easiest one to fix. Eggs, Greek yogurt, or a protein shake, pick one and make it habit.
• "Just eating less of everything" to manage nauseaWrong fix. Eat smaller, more frequent, protein-forward meals instead of starving and then feeling sicker.
• Ignoring micronutrientsB12, vitamin D, iron, calcium, and magnesium are commonly low during rapid weight loss. Get labs every six months while on a GLP-1.

Part NineQuestions I get every week