What to Eat (and Take) When Starting a GLP-1

The first weeks on a GLP-1 are when habits matter most — and when they're hardest to build. Appetite drops fast, sometimes within days of the first dose. If you haven't decided in advance what you'll eat and what you'll take, you'll find yourself managing by default. Setting up before you start is always better — but if you're already started, here's exactly what to focus on now.

The protein-first rule

Every time you eat — even a small amount — protein comes first. This is the most important dietary habit on a GLP-1, and it works for a simple reason: protein is the nutrient that helps protect muscle during weight loss, and it's the first thing to fall when appetite goes.

The best-tolerated protein sources on a GLP-1 tend to be:

• Eggs — versatile, easy to prepare in small amounts, well-tolerated
• Greek yoghurt — high protein per volume, cool temperature often sits well
• White fish or chicken — light, not greasy, easy to portion small
• Cottage cheese — high protein, minimal prep, cold
• Tofu — soft texture, mild flavour, easy to eat in small amounts
• Whey protein isolate shake — the default on days when solid food isn't happening. ~25g of protein in a glass of water, sipped slowly.

Eat small and often

The stomach empties more slowly on a GLP-1. Large meals become uncomfortable — even nauseating. Four or five small protein-led eating occasions across the day is far more effective than three standard meals. Think: a small portion of eggs, then a shake mid-morning, then a small meal, then a yoghurt. Small amounts add up when protein leads every one of them.

Go easy on the gut

In the early weeks, several food categories tend to worsen GLP-1 nausea and should be limited:

• High-fat or greasy foods — they slow digestion further on top of the medication
• Very large portions — the stomach empties more slowly; smaller volumes tolerate better
• Sugary drinks — worsen nausea and contribute no protein
• Strongly flavoured or spicy food — can amplify queasiness

Bland, cold, simple, and protein-led is the formula that works for most people in the early adjustment phase.

Fluids and fibre

Constipation is among the most common early side effects — a combination of slower gut motility from the medication and drinking less when appetite is suppressed. Make a deliberate effort to drink water consistently through the day (not just when thirsty) and include fibre sources in the small meals you're eating — vegetables, pulses, oats if tolerated.

Cover the nutritional gaps from day one

Eating significantly less means taking in significantly less of everything — not just calories. From the first week, four compounds cover the most important gaps:

• Whey protein isolate — bridges the protein gap on low-appetite days
• Creatine (3–5g daily) — helps preserve muscle and strength in a deficit
• Omega-3 (EPA+DHA) — supports cardiovascular and metabolic health during rapid weight loss
• Magnesium — the first mineral to run low on reduced intake; supports energy, sleep and muscle function

The GLP-1 Support Stack bundles all four. Or get the free Pre-Start Guide with the full setup checklist.