How many grams of protein per day do you need on Wegovy?

What the evidence says about protein during calorie restriction

The short version: when you eat less, your body needs proportionally more protein to hold onto muscle. General UK dietary reference values suggest 0.75 g of protein per kilogram of body weight per day for healthy adults, and NHS Live Well guidance on healthy weight is built around that baseline. But that figure is designed for maintenance, not for the physiological stress of meaningful weight loss.

Clinical nutrition research consistently shows that a higher target (1.2–1.6 g per kg daily) better preserves lean mass during a calorie deficit. A 75 kg person, for example, would aim for roughly 90–120 g of protein each day. A 100 kg person would target 120–160 g. These are ranges to discuss and refine with a prescriber or dietitian; they are not a fixed prescription for everyone.

Wegovy amplifies this dynamic. Because semaglutide suppresses appetite strongly, total food intake drops, and if those smaller meals are mainly toast, soup or easy-to-eat carbohydrates, protein is the first macronutrient to fall short. The result can be that some of the weight lost includes muscle tissue, which is harder to rebuild than it sounds and affects long-term metabolic health. Prioritising protein is not about gym culture. It is about making sure the weight that leaves is predominantly fat.

Spreading protein through the day when you are not very hungry

One misconception worth putting to rest: that a single high-protein meal (a large chicken breast at dinner, say) covers the day's needs. In practice, the body can only use a certain amount of dietary protein for muscle synthesis per meal; the rest is used for energy or excreted. Most nutrition researchers recommend spreading intake across at least three meals, aiming for roughly 25–40 g per sitting depending on your target and body size.

On Wegovy, that can feel like a lot when your appetite is genuinely low. A few approaches that work without forcing large portions: starting meals with the protein first (before vegetables or carbohydrates fills the stomach), choosing protein-dense formats like Greek yoghurt, eggs, cottage cheese, tinned fish or legumes that deliver high protein per unit of volume, and building at least one protein supplement into the day if whole-food sources alone are hard to reach.

The goal is consistency over days and weeks, not perfection at every meal. If nausea is an issue (particularly after a dose increase) lighter, easier-to-tolerate protein sources such as plain Greek yoghurt, a small amount of nut butter, or a mild protein drink can help you maintain intake without triggering discomfort. Our guide to managing protein intake on Wegovy covers these practical approaches in more detail.

Choosing the right protein sources while on Wegovy

Not all protein sources sit equally well during GLP-1 treatment. Wegovy slows gastric emptying (food stays in the stomach longer) which is partly why appetite falls. That same effect means very fatty protein sources (a heavy steak, full-fat cheese in large amounts) can feel uncomfortable or worsen nausea, especially in the first few weeks or after each dose step. Lean sources tend to be better tolerated: chicken, turkey, white fish, eggs, low-fat dairy, tofu, tempeh, edamame and pulses.

For a fuller breakdown of food choices by phase of treatment, the what to eat on Wegovy page goes through the practical detail. If you are considering a protein supplement, it is worth reading about which protein shakes work well alongside Wegovy, not all products are equally suitable and some are very high in calories or sugar.

There is also a question about whether semaglutide itself is a protein, a reasonable thing to wonder given its molecular structure. The short answer is yes, it is a modified peptide, but it contributes nothing to your dietary protein intake and the question is separate from this one entirely.

For the broader picture on Wegovy (how it works, what to expect, and how private treatment through a regulated pharmacy works) the Wegovy treatment page is the place to start. If cost is part of your thinking, the Wegovy cost page sets out what private treatment typically involves in honest terms. Protein is one piece of the puzzle. Getting the clinical foundation right is the other, speak to our prescribers if you would like to understand what ongoing dietary support looks like from the start.