GLP-1 diet: The foods that help — and the ones making your symptoms worse

If you’ve spent years dieting and hitting the gym with little success, GLP-1 medications like Wegovy can feel like a “finally” moment. But because these drugs can significantly reduce how much you eat — in some studies, by nearly 40% — what you put on your plate becomes more important than ever. “Many people coming to these medications have spent years — sometimes even decades — cycling through diets and feeling like they’re fighting their own body, so I understand the tendency to want to stop thinking about nutrition,” says Samantha Cassetty, a registered dietitian and founder of Sam’s Plate, a nutrition Substack. “But GLP-1s work best as a partner to good nutrition and movement.”

GLP-1 medications such as Ozempic and Mounjaro work partly by slowing how quickly food leaves your stomach, which helps you feel full for longer, and by acting on receptors in the brain to reduce appetite and cravings. That means fewer opportunities to get the nutrients your body relies on. While occasionally falling short of your fiber goals or vitamin D likely isn’t going to make a noticeable difference in your health, doing so regularly can contribute to or worsen some of the most common GLP-1 complaints, including fatigue, constipation, muscle loss and hair shedding.

As a registered dietitian who has counseled patients on GLP-1 medications for over four years, I’m often surprised — and honestly frustrated — that the conversation so often seems to focus on weight loss, but too rarely on the specific ways diet affects how you feel on these drugs.

With that in mind, I reached out to four experts who regularly work with patients taking GLP-1 medications, including medical doctors and registered dietitians, for their advice on what to eat and what to avoid when taking drugs like Wegovy or Zepbound. Here’s what they said.

Foods and eating habits to prioritize on GLP-1s

Protein first — at every meal

GLP-1s don’t just shrink your appetite — they can contribute to muscle loss too, unless you’re deliberate about protein. Research suggests that roughly 25% to 40% of weight lost during GLP-1 therapy may come from lean mass, not just fat. (Lean mass includes muscle, but also water, bone, organs and other tissues.)

Muscle isn’t just about bigger biceps. Muscle mass plays a key role in metabolism (how many calories you burn at rest), maintaining stable blood sugar levels, supporting bone health and reducing the risk of falls as you age. A 2025 meta-analysis of 11 prospective studies and more than 130,000 people found that low lean mass was linked with a 30% higher risk of dying from any cause in middle-aged and older adults — meaning preserving muscle during weight loss isn’t just a cosmetic concern.

Along with regular resistance training, getting enough protein is one of the best ways to minimize muscle loss on GLP-1 medications. And no, you don’t need to start guzzling protein coffee in the morning. Instead, “aim for 20 to 30 grams of protein at meals and snacks, and eat your protein first, before you fill up,” recommends Cassetty. For context, 4 to 5 ounces of meat — roughly the size of a deck of cards — gets you there.

High-protein foods to prioritize include:

• Cottage cheese
• Greek yogurt
• Poultry, such as chicken and turkey
• Lean cuts of beef, such as tenderloin, top sirloin and flank steak
• Lean cuts of pork, such as tenderloin and top loin
• Fish and seafood
• Tofu, tempeh and edamame
• Beans and lentils

Fiber is your friend on GLP-1s

Fiber matters to everyone, but soluble fiber is especially important when you’re on a GLP-1, because GI issues are among the most common side effects. “Soluble fiber forms a gel in the digestive tract to help regulate stool consistency, which is why it’s useful for both constipation and diarrhea that may accompany these medications,” Cassetty explains.

One caveat: a 2025 joint advisory from four major medical societies recommends temporarily limiting high-fiber foods during the first few days of starting or increasing your dose, when nausea is most likely. Once you’ve adjusted, gradually increasing fiber is one of the most helpful dietary strategies for managing GI symptoms.

Foods high in soluble fiber include:

• Oats
• Beans and lentils
• Asparagus
• Broccoli
• Sweet potatoes
• Strawberries
• Apples
• Oranges
• Avocados

Nutrient density: Make every bite count

Protecting your lean mass and managing GI symptoms are two big reasons to be deliberate about what you eat on a GLP-1. There’s another important one: avoiding nutrient shortfalls. A 2026 narrative review of nearly half a million GLP-1 users found striking nutritional gaps: more than 60% fell short on calcium and iron and vitamin D intake hit just 20% of recommendations. “When your appetite drops dramatically, your diet has to become much more efficient,” says Cassetty.

Dr. Omodamola Aje, a board-certified endocrinologist at Berkshire Medical Center who manages patients on GLP-1 medications daily, agrees, adding that she finds most of her patients eat too little, not too much. “I tell every patient: you are not just trying to eat less, you are trying to eat intentionally.”

Nutrient-dense foods to prioritize include:

• Fruits
• Vegetables
• Nuts
• Seeds (a personal favorite for adding nutrition without bulk — chia and hemp seeds can be sprinkled over virtually anything)
• Legumes
• Whole grains
• Lean meats

Don’t forget to drink water

Another key for both overall health and minimizing side effects is making sure you’re drinking enough water throughout the day. JAMA Internal Medicine suggests 8 to 12 cups (2 to 3 liters) daily for GLP-1 users. “GLP-1 medications can decrease both appetite and thirst, so some people unintentionally become dehydrated,” cautions Dr. Janelle Duah, associate medical director at Maven Clinic. Investing in a reusable water bottle you can take with you everywhere is a simple habit that makes a real difference.

What to limit or avoid on GLP-1s

Cut back on ultra-processed and sugary foods

On a GLP-1, most bites need to earn their place. “There’s not a lot of room for foods that take up space without contributing much back,” says Cassetty. Beyond their limited nutritional value, sugary and ultra-processed foods can create blood sugar spikes and crashes, which may worsen nausea, fatigue and cravings.

Examples include:

• Chips
• Cookies
• Candy
• Donuts
• Crackers
• Sugary breakfast cereals
• White sandwich bread
• White pasta

Homemade desserts, like cake and pie, and sugary beverages — think soda, sweet tea, sports drinks and sweetened fruit juice — also fall into this category.

Go easy on fried and greasy foods

High-fat, fried and greasy foods — think burgers, pizza, bacon and anything cooked in a lot of oil — are another category to limit. Because GLP-1s already slow digestion, “these foods tend to linger in the stomach longer and can intensify nausea or feelings of fullness,” says Duah. They’re also associated with a higher risk of heart disease when eaten frequently, making them a smart food category to cut back on, regardless of whether you’re taking a GLP-1. When possible, try baking, grilling, steaming or roasting instead, especially early in your GLP-1 journey or around dose increases.

Beware of sugar-free labels

In “diet” or “sugar-free” packaged foods like protein bars and low-carb breakfast cereals, you’ll often find sugar alcohols — ingredients like xylitol, erythritol and sorbitol that add sweetness with fewer calories and a smaller blood sugar impact than sugar. That sounds like a win, but in high quantities, sugar alcohols can worsen the GI side effects you’re already trying to avoid. “While not inherently harmful, they can worsen gastrointestinal side effects like gas, nausea and diarrhea,” warns Erin Seprish, a registered dietitian nutritionist.

Alcohol hits harder on GLP-1s

Alcohol isn’t strictly off-limits on a GLP-1, but because it’s high in calories and delivers no nutritional value, it’s exactly the trade-off worth weighing carefully when you’re already eating significantly less. It also hits harder than you might expect. Aje always tells patients to eat something before drinking and go slowly. “Many of my patients are surprised to find one drink feels like two,” she says.

There may be a biological reason for that: A 2025 Yale study found that GLP-1 medications reduced the liver’s ability to metabolize alcohol, meaning blood alcohol levels may rise higher and stay elevated longer than they would otherwise. (GLP-1s may also reduce the urge to drink — an effect some welcome.)

“Alcohol can worsen nausea, contribute to dehydration and, in some individuals, increase the risk of low blood sugar or gastrointestinal symptoms,” warns Duah. If you’re experiencing any of these side effects, she says, cutting back on alcohol can make a noticeable difference.

If you choose to drink, Aje recommends avoiding sugary cocktails, which can send blood sugar levels on a rollercoaster. Instead, opt for dry wine, spirits with soda water or light beer. As always, moderation is key: no more than two drinks per day for men and one for women.

What to eat on injection day

One of the hardest parts of eating well on a GLP-1? Injection day. Nausea, a common GLP-1 side effect, tends to peak within 12 to 24 hours after injection, says Aje, which means a full, balanced meal may not sound appealing. “I usually recommend focusing on hydration and choosing nutrient-dense foods that are easy to tolerate,” Seprish says. Some examples include:

• Protein shakes
• Smoothies
• Cottage cheese
• Greek yogurt
• Oatmeal made with milk
• Bone broth
• Scrambled eggs
• Toast with nut butter
• Chicken and brown rice
• Cheese and whole-grain crackers
• Soft fruits, like bananas or unsweetened applesauce

“The goal isn’t perfection — it’s making sure you’re still eating protein and fiber at each meal,” says Seprish. If three full meals feel like too much, Cassetty suggests small, frequent meals throughout the day instead.

One more thing worth discussing with your provider: injection timing. “I generally recommend giving yourself the injection at night,” says Duah, noting that this may help increase the chance that nausea peaks overnight, not during eating hours. Eat a light dinner beforehand and avoid anything large or high-fat.

Could nutrition gaps be making GLP-1 side effects worse?

Some symptoms people experience on GLP-1s can be worsened by what they are — or aren’t — eating, especially if lower appetite leads to lower fluid, protein or micronutrient intake. GLP-1-related fatigue, for example, may be caused or worsened by nutritional gaps. “Persistent fatigue should not simply be dismissed as a normal side effect. It can reflect dehydration, inadequate calorie intake or nutritional deficiencies such as iron, vitamin B12 or vitamin D,” says Duah.

Here’s a quick guide to what could be contributing to common symptoms:

• Fatigue and weakness: Low iron, vitamin B12 and/or vitamin D
• Hair thinning: Low protein, iron and/or zinc
• Muscle loss: Insufficient protein
• Muscle cramps: Low magnesium or calcium
• Mood changes: Low vitamin D, B12 and/or omega-3 fatty acids
• Constipation: Low soluble fiber and/or dehydration

Unsure whether you’re hitting your nutrient needs? The best way to know is by working with a registered dietitian, who can assess whether you’re getting enough calories, protein, fiber, fluids and key micronutrients. It can also be helpful to ask your provider for bloodwork to check for specific vitamin and mineral deficiencies.

FAQs

What should I eat if I’m nauseous on a GLP-1?

For nausea, focus on small meals every three to four hours, eaten slowly. “Nausea often becomes worse when people skip meals entirely,” says Duah. Stick to soft, bland foods that are still high in protein — cottage cheese, Greek yogurt, scrambled eggs, bananas and smoothies are all good options. Ginger tea can also help.

How much protein do I need on a GLP-1?

Most experts recommend aiming for roughly 0.5 to 0.7 grams of protein per pound of body weight daily while taking a GLP-1. For a 150-pound person, that’s about 75 to 105 grams per day. Spread across meals and snacks, it’s often more manageable than it sounds.

Can I drink alcohol on Ozempic or Wegovy?

Yes, but with a few caveats worth knowing. Alcohol hits harder on GLP-1s — one drink can feel like two — and can worsen nausea and dehydration. Eat before you drink, go slowly, skip the sugary cocktails and stick to no more than two drinks per day for men, one for women. See our full breakdown above.

What can I eat to help prevent hair loss on a GLP-1?

Hair loss on a GLP-1 is usually not caused by the medication itself. “It is more commonly related to telogen effluvium, a temporary condition that can occur after rapid weight loss or significant calorie restriction,” says Duah, who recommends getting enough protein, iron and zinc through food or a daily multivitamin. Good sources of all three include beef, sardines, chicken, turkey, lentils and chickpeas.

Do GLP-1 medications reduce cravings?

Typically, yes — though not always. GLP-1s appear to affect reward pathways in the brain, which may help reduce cravings for food and alcohol. Many people report less “food noise,” fewer cravings and urges to snack.

That said, cravings don’t always disappear completely. “When the reward signal for alcohol is dampened, some patients shift their cravings toward sweets or highly palatable ultra-processed foods instead,” Aje says. “It’s like the reward system is looking for another outlet.”

To help manage cravings, experts recommend prioritizing protein, eating regular meals and avoiding overly restrictive diets, which can sometimes backfire.

Meet our experts

• Samantha Cassetty, RD, founder of Sam’s Plate and coauthor of Sugar Shock
• Omodamola Aje, MD, board-certified endocrinologist at Berkshire Medical Center
• Janelle Duah, MD, associate medical director at Maven Clinic
• Erin Seprish, RDN, lead nutritionist at MeAgain 

Our health content is for informational purposes only and is not intended as professional medical advice. Consult a medical professional on questions about your health.