Patient Playbook
The GLP-1 & weight loss survival guide.
Everything you need to thrive on semaglutide, tirzepatide, or retatrutide — protein targets, hydration, supplements, strength training, and how to crush common side effects before they crush you.
The 6 Pillars
Master these and the medication does the rest.
Protein first, always
On GLP-1s appetite drops fast — and so does muscle if you don't prioritize protein. Lose fat, not muscle.
Hydrate like it's your job
GLP-1s slow gastric emptying. Dehydration is the #1 reason patients feel awful — and the easiest to fix.
Lift heavy, walk daily
Strength training is non-negotiable. It's the difference between losing 'weight' and transforming your body.
Bridge the nutrient gap
Eating less means absorbing less. The right supplements protect your hair, energy, sleep, and muscle.
Eat real, whole foods
Highly processed and greasy foods amplify nausea. Whole-food meals digest cleaner and stretch your nutrients further.
Manage side effects early
Most issues — nausea, constipation, fatigue, sulfur burps — have simple fixes if you catch them on day one.
Pillar 1
Protein first. Every single meal.
The biggest mistake on GLP-1s isn't eating too much — it's eating too little protein. Up to 40% of the weight lost on GLP-1s can come from lean muscle if you don't protect it. Less muscle means a slower metabolism, sagging skin, and weight regain when you stop the medication.
Your daily protein target
Aim for 0.8–1.0 g of protein per pound of goal body weight, per day. For most women that's 100–140g; for most men 140–180g.
Split it across 3 meals — roughly 30–40g per meal — to maximize muscle protein synthesis. Protein at every meal beats one big protein bomb.
Best protein sources
- Eggs & egg whites (easy to tolerate first thing)
- Greek yogurt, cottage cheese, skyr
- Chicken, turkey, lean beef, bison
- Wild salmon, white fish, shrimp, tuna
- Whey isolate or grass-fed protein shakes
- Bone broth (gentle on a sensitive stomach)
- Tofu, tempeh, edamame (plant options)
Pro tip: Eat your protein first at every meal. Once a GLP-1 fills you up, you want the muscle-protective calories already in. Carbs and fats can come after.
Pillar 2
Drink more water than feels normal.
GLP-1s blunt your thirst signal at the same time they slow digestion. Most of the "fatigue, headaches, constipation, dizziness" patients blame on the medication is actually mild dehydration. Fix this first.
The target
Half your body weight in ounces, minimum. A 160 lb patient = 80+ oz per day. Add 16 oz for every hour of exercise or sauna.
Add electrolytes
Eating less means losing sodium, magnesium, and potassium. Add 1–2 servings of an electrolyte mix daily (LMNT, Re-Lyte, or a sugar-free version of choice).
Sip, don't gulp
Large volumes of water at once can worsen nausea and reflux. Sip steadily through the day; stop drinking 20 minutes before meals so food has room.
Pillar 3
Lift heavy, walk every day.
Strength training is the single most important behavior on a GLP-1. It tells your body to keep muscle while you eat in a calorie deficit. Skip it, and you'll lose weight on the scale but watch your body composition go the wrong direction.
Weekly minimum
- 3–4× per week: full-body strength training, progressive overload
- 8,000–10,000 steps/day: daily walking, ideally outside
- 2× per week: Zone 2 cardio (brisk walk, easy bike) — 30–45 min
- Daily: 10-min post-meal walk to blunt glucose spikes
What to prioritize
Compound lifts beat isolation. Pick a handful and rotate:
- Squats / split squats
- Deadlifts / RDLs
- Hip thrusts
- Push-ups / bench press
- Rows
- Pull-ups / lat pulldowns
- Overhead press
- Carries
Hire a trainer for 4–6 sessions if you're new — form first, intensity second.
Pillar 4
Bridge the nutrient gap.
When you eat 40% less food, you absorb 40% less nutrition. These are the supplements we recommend for almost every GLP-1 patient. (Always confirm with your provider — these are not personal medical advice.)
High-quality protein powder
1–2 scoops/day
Easiest way to hit your daily protein target. Whey isolate digests cleanly; plant blends work for sensitive stomachs.
Creatine monohydrate
5 g/day
Protects muscle in a deficit, supports strength, brain, and energy. The most studied supplement on earth — and dirt cheap.
Magnesium glycinate
300–400 mg at night
Constipation, muscle cramps, poor sleep — all classic signs of low magnesium on GLP-1s.
Electrolytes (Na / K / Mg)
1–2 servings/day
Prevents headaches, fatigue, dizziness. Skip the sugar — use LMNT, Re-Lyte, or similar.
Vitamin D3 + K2
2,000–5,000 IU D3 + 100 mcg K2
Bone, mood, immunity. Almost every weight loss patient is deficient. Test annually.
Omega-3 (EPA/DHA)
2–3 g/day
Anti-inflammatory, supports mood and cardiovascular health while you remodel your body.
B-complex (methylated)
1/day
Energy, mood, and muscle protein synthesis. Eating less = lower B-vitamin intake.
Collagen peptides
10–20 g/day
Supports skin elasticity, joints, and hair as you lose weight rapidly. Stir into coffee or shake.
Digestive enzymes / ginger
as needed with meals
Helps with the fullness, bloating, and reflux that comes from slowed gastric emptying.
Fiber (psyllium or acacia)
5–10 g/day
Keeps you regular. Pair with extra water — fiber without water makes constipation worse.
Pillar 5
Build your plate. Eat real food.
On a GLP-1 you might only eat 1,000–1,400 calories. Every bite has to earn its place. Here's the simple plate formula that works for almost every patient:
½ plate
Non-starchy vegetables
Leafy greens, broccoli, asparagus, peppers, zucchini, cucumber, tomatoes.
¼ plate
Lean protein (30–40g)
Chicken, fish, eggs, Greek yogurt, lean beef, tofu, cottage cheese.
¼ plate
Slow carbs + healthy fat
Quinoa, sweet potato, berries, oats + avocado, olive oil, nuts, seeds.
Foods that work
- Eggs
- Greek yogurt
- Bone broth
- Grilled chicken
- Salmon, white fish
- Cottage cheese
- Berries
- Avocado
- Sweet potato
- Quinoa, rice
- Sourdough
- Steamed veggies
Foods that backfire
- Fried / greasy food
- Heavy cream sauces
- Carbonated drinks
- Alcohol
- Sugary desserts
- Processed snacks
- Refined white carbs
- Large portions
- Spicy + acidic
- High-fat takeout
- Sugary coffee drinks
- Energy drinks
Pillar 6
Side-effect rescue guide.
Almost every side effect has a simple, in-home fix. If something feels severe or persists more than a few days — call us.
A word on alcohol
Less goes a much longer way.
GLP-1s slow gastric emptying, which means alcohol hits faster, hangovers hit harder, and your tolerance drops. Most patients report a natural loss of interest in drinking — lean into it. If you do drink, eat protein first, sip water alongside, and cap it at 1–2 drinks. Daily drinking will stall your results.
Need a personalized plan?
We don't just prescribe — we coach.
Body Tonic RX patients get provider-supervised GLP-1 protocols (semaglutide, tirzepatide, retatrutide), body composition tracking, and check-ins designed to protect muscle while you lose fat.