The GLP-1 Diet: What to Eat (and What to Skip) When You're on Semaglutide or Tirzepatide

By Brandon Phillips — May 21, 2026

The GLP-1 diet rules our physicians give every patient: protein targets, foods to skip, hydration, and a sample day of meals.

GLP-1 medications change how you eat before they change what you weigh. Your appetite drops. Food sits longer in your stomach. Some foods you used to love now make you nauseous.

The patients who get the best long-term outcomes do three things: hit their protein target, stay hydrated, and avoid the foods that stack badly with delayed gastric emptying. Here's the playbook.

Rule 1: Protein first, every meal

Your appetite is suppressed, so you'll eat less total food. That's the point. But if you eat less total food and the food you do eat is mostly carbs, you'll lose muscle alongside fat — which slows your metabolism and makes regain after treatment more likely.

Target: 0.7–1.0 g of protein per pound of goal body weight per day.

For a 200-pound person targeting 160 lb, that's ~110–160 g/day, split across 3 meals.

Best sources:

• Greek yogurt, cottage cheese, eggs
• Chicken breast, turkey, lean beef, salmon, tuna, shrimp
• Tofu, tempeh, edamame
• Whey or plant protein shakes (genuinely useful when appetite is low)

Rule 2: Skip these — they hit harder on a GLP-1

Because food is leaving your stomach more slowly, certain things become much more uncomfortable than they used to be:

Rule 3: Hydration is non-negotiable

Constipation is the #1 side effect that lingers on GLP-1s. Two reasons: less food → less fiber, and people forget to drink because they don't feel thirsty.

Target: 80–100 oz of water per day. Add electrolytes if you're active.

Rule 4: Fiber rescues your gut

Aim for 25–35 g of fiber daily. Best sources during GLP-1 therapy:

• Berries, apples with skin, pears
• Beans, lentils, chickpeas
• Oats, chia seeds, flax seeds
• Cooked leafy greens (raw can feel heavy)
• Psyllium husk supplement if needed

A sample day on a GLP-1

Breakfast — Greek yogurt (1 cup) with berries, chia seeds, and a drizzle of honey. ~25 g protein.

Lunch — Grilled chicken (4–5 oz) over a big mixed-greens salad with chickpeas, avocado, olive oil, and lemon. ~35 g protein.

Snack — Protein shake with a banana, or cottage cheese with cucumber. ~25 g protein.

Dinner — Salmon (5 oz) with roasted broccoli and quinoa (½ cup). ~35 g protein.

Total: ~120 g protein, ~30 g fiber, ~1,400 kcal. Adjust portions to your physician's guidance.

What if you can't finish meals?

That's normal in the first 4–8 weeks of any dose increase. Don't force volume. Instead:

• Eat protein first while your appetite window is open.
• Use shakes when whole food feels too heavy.
• Eat 4–5 smaller meals instead of 3 large ones.

Nutrition coaching at GOAL.MD

Every GLP-1 patient at GOAL.MD has access to physician-led nutrition guidance — not generic meal plans. Your protein target, calorie floor, and macro split are tailored to your goal weight and current dose. Start with our 3-minute intake to enroll.

Medically Reviewed

Medically Reviewed by

Dr. Michael Fitch, MD

Internal Medicine, Preventive Care & Men’s Health

NPI: 1366462889
· Reviewed May 21, 2026

Reviewed on behalf of Pro Medical Reviews, LLC (NPI 1477321198).
Questions? Contact customer@jellyfish.md.

References

1. Wilding JPH et al. "Once-Weekly Semaglutide in Adults with Overweight or Obesity" (STEP 1). N Engl J Med. 2021;384:989–1002. Link
2. FDA Prescribing Information — Wegovy (semaglutide) injection. Link
3. American Gastroenterological Association. "Pharmacological Interventions for Adults with Obesity." Gastroenterology. 2022. Link

This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before starting any treatment.

Medically reviewed by Dr. Michael Mimlitz, MD (NPI 1508891870), Chief Physician of GOAL.MD. Physician-supervised telehealth. More at goal.md/blog.