What to Eat on Mounjaro or Wegovy

Almost everyone starting Mounjaro or Wegovy expects to eat less. What surprises people is how little effort it takes. Appetite falls away, meals stop feeling urgent, and it becomes genuinely possible to reach 4pm having eaten a slice of toast. That feels like winning. Nutritionally, it is the riskiest part of treatment.

These medicines are licensed as an adjunct to a reduced-calorie diet and increased physical activity — not as a replacement for either. When total food volume drops by a third or more, protein, fibre and micronutrients drop with it unless you deliberately protect them. The patients who do best at our Timperley pharmacy are rarely the ones who eat the least. They're the ones who eat smaller, better-built meals on purpose.

The UK reference nutrient intake for protein is 0.75 g per kg of body weight a day — roughly 45 g for women and 56 g for men. That figure describes the minimum needed to avoid deficiency in an adult who isn't losing weight. It is not a target for someone dropping 15–20% of their body weight over a year.

Clinical nutrition guidance written specifically for the GLP-1 era proposes intakes of at least 1.2 g/kg a day, up to around 1.6 g/kg in suitable adults without chronic kidney disease, spread evenly across meals rather than loaded into the evening. For an 80 kg person that's roughly 95–130 g a day, or about 30–40 g per meal. If you have kidney disease, are pregnant, or take other medicines that affect protein handling, that target needs setting individually — ask us rather than assuming.

Hitting 30 g in a meal is easier than it sounds when you know what a portion actually contains:

Figures are approximate and vary by brand and cooking method — they're there to give you a working sense of scale, not to be weighed to the gram.

This is the question we're asked most often, usually after someone has read a headline about "Ozempic muscle loss". The honest answer needs two facts.

First, some lean mass is always lost with substantial weight loss. In the SURMOUNT-1 body composition substudy, 160 participants had DXA scans at baseline and week 72. On tirzepatide, body weight fell 21.3%, fat mass fell 33.9% and lean mass fell 10.9% — meaning roughly 75% of the weight lost was fat and 25% lean. The crucial detail: the placebo group lost weight in almost exactly the same proportion. The ratio is ordinary; the amount of weight lost is not.

Second, the same pattern appears with semaglutide. In the STEP 1 DXA substudy, total fat mass fell 19.3% and visceral fat 27.4%, while total lean body mass fell 9.7% — but lean mass as a proportion of total body mass actually rose by 3.0 percentage points. Body composition, on average, improved.

"On average" is doing real work in that sentence. Averages hide the person who eats 40 g of protein a day and never leaves a chair. That person's ratio will be worse — and no dose adjustment fixes it. Diet and training do.

Protein gives your body the material to keep muscle. Resistance exercise gives it the reason. Neither works well without the other, and the evidence on preserving lean mass during energy restriction consistently points to the combination rather than either alone.

NHS guidance for adults aged 19 to 64 is at least 150 minutes of moderate-intensity activity a week, plus strengthening activities on at least 2 days a week working all the major muscle groups — legs, hips, back, abdomen, chest, shoulders and arms. The practical version: 8 to 12 repetitions counts as one set, and at least two sets per exercise. Strengthening work sits alongside the 150 minutes, not inside it.

You do not need a gym membership. Resistance bands, bodyweight squats from a chair, wall press-ups and carrying shopping in both hands all qualify. What matters is that the last couple of repetitions feel genuinely hard, and that you do it twice a week for as long as you're losing weight. Start where you are — if you're currently sedentary, two short sessions a week beats an ambitious plan you abandon by week three.

"Food noise" has moved from patient slang into the research literature — it describes the intrusive, repetitive thinking about food that many people with obesity live with constantly: planning the next meal while eating this one, negotiating over the biscuit tin, running a background commentary on what's in the cupboard. Researchers are now working on formal ways to define and measure it, precisely because so many people on GLP-1 treatment report it fading.

When patients describe that quiet to us, it's often with relief and a little disbelief. It is a real and welcome effect — and it is also temporary in an important sense. It lasts while the medicine does. Which makes the treatment period the best chance you will ever get to build eating habits without fighting your own appetite at the same time: regular meals, protein first, a shopping list that works, cooking you can repeat.

We say this to every patient at their monthly review: the medicine buys you a quiet room to learn in. Use it. What you practise now is what carries you when the dose changes, or when treatment eventually ends.

Constipation is one of the most common complaints we hear, and the cause is usually arithmetic rather than the drug itself: eat a third less food, and you eat a third less fibre. UK guidance is 30 g of fibre a day, and most adults only manage about 20 g before treatment — so it doesn't take much of a drop to cause trouble. Wholegrain versions of bread, pasta and rice, potatoes with skins on, beans, pulses, fruit and vegetables are the usual fixes. Increase gradually over three to five days rather than overnight, or you'll trade constipation for bloating.

Fluid matters just as much and is easier to forget when you're not eating much. Aim for the standard NHS 6 to 8 glasses a day, sipped steadily rather than gulped with meals. This isn't just comfort advice: the Wegovy product information notes that nausea, vomiting and diarrhoea can cause dehydration, which in rare cases can lead to deterioration in kidney function — so patients are specifically advised to take precautions against fluid depletion. If you have a bad few days of vomiting or diarrhoea, tell us rather than pushing through.

These medicines slow stomach emptying, which is part of how they work — and also why a large, rich, fried meal can sit like a stone for hours. If nausea is your problem, the food answers are unglamorous but effective: smaller portions, eaten slowly, plainer and lower in fat, with fluids taken between meals rather than during them. Stop when you first notice fullness, not when the plate is empty; on treatment, the signal arrives late and then all at once.

If symptoms are stopping you eating properly at all, that's a reason to talk to us, not to soldier on — a slower titration often solves it without losing progress. Our week-by-week side-effect guide covers each symptom in detail, and our health advice pages cover the wider lifestyle side. Gallbladder problems are also worth knowing about: cholelithiasis (gallstones) was reported in 1.6% of patients on semaglutide 2.4 mg, leading to cholecystitis in 0.6% — a recognised consequence of rapid weight loss however it is achieved. Persistent severe upper abdominal pain always needs checking.

Not a meal plan — an illustration of what hitting protein looks like when appetite is low. Breakfast might be a Greek yoghurt pot with berries and a spoon of seeds (~20 g protein). Lunch: a tin of tuna or two eggs on a slice of wholegrain toast with salad (~25–30 g). Dinner: a modest chicken breast or salmon fillet, half a plate of vegetables, a small portion of potatoes with skins on (~35 g). That's roughly 85 g of protein and a solid fibre base from meals that are individually small.

On a bad day, a shake and a yoghurt beat nothing. On a good day, add a snack — cottage cheese, a handful of nuts, or beans on toast. Personal targets depend on your weight, kidney function and other conditions, which is exactly what we work out together at your review. If you're still deciding between treatments, our treatment comparison and Wegovy pill vs injection guide are the place to start.

WeightGone UK is a GPhC-registered pharmacy (reg. 1118728) on Stockport Road in Timperley, Altrincham, serving Sale, Hale, Stretford, Wythenshawe and the wider Greater Manchester area. Diet is not an afterthought here: every patient is seen face-to-face at least once a month, weighed on the same scales, and asked what they've actually been eating — not just whether they took the dose. That's the conversation that catches under-eating early, before it shows up as fatigue, hair thinning or a stalled scale.

Treatment at our pharmacy starts from £100/month for Wegovy and £160/month for Mounjaro, with every price including those in-person reviews — see all treatments and prices or read how the programme works.