Medicines that reduce appetite can make weight loss feel more manageable, but eating much less does not automatically mean eating well.
During perimenopause and menopause, preserving muscle and meeting nutritional needs becomes especially important. The goal is not to chase the quickest possible fall on the scales at the expense of strength, energy or health.
Why do protein and strength matter during weight-loss treatment?
When body weight falls, some of the loss may come from lean tissue as well as fat. Protein provides the building blocks needed to maintain and repair muscle, while resistance-based activity gives the body a reason to retain it. Together, they support strength, function and healthier body composition during treatment.
Successful treatment is not just about losing weight quickly. We also want patients to remain strong, well nourished and able to maintain the changes they achieve. Protein, resistance work and regular clinical review are part of that wider picture.
A lower number on the scales does not show what was lost. Weight change can include fat, water and lean tissue. Strength, energy, waist measurement, fitness and health markers can provide useful context alongside weight.
Why does muscle matter more during perimenopause and menopause?
Muscle mass and strength tend to decline gradually with age. The menopause transition may coincide with further changes in body composition, although age, activity, nutrition, health and hormonal factors all interact.
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Function
Strength and independence
Muscle helps with stairs, lifting, carrying, getting up from the floor and everyday movement.
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Health
Balance, bones and resilience
Stronger muscles support balance, physical confidence and the forces that help maintain bone health.
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Metabolism
Energy use and glucose handling
Muscle is metabolically active tissue and plays an important role in how the body uses glucose.
Muscle does not make metabolism “fast” or prevent weight regain on its own. Preserving it supports function and may help avoid an unnecessary reduction in daily energy needs during weight loss.
Can weight loss include muscle loss?
Yes. Any meaningful weight loss — whether achieved through dietary change, medication, surgery or a combination — can include some loss of lean tissue as well as fat.
Appetite-reducing treatment can make this easier to overlook because portions may become very small. If total intake, protein and resistance activity are all low, the body has less nutritional input and less stimulus to retain muscle.
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Faster is not always better
Very rapid loss may feel encouraging, but it can make adequate nutrition and muscle protection more difficult.
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Healthier loss considers quality
The aim is to reduce excess fat while supporting strength, energy, nutrition and routines that can continue.
No approach can guarantee that every kilogram lost will come from fat. The practical goal is to reduce avoidable muscle loss rather than promise that it will not happen.
How much protein is enough?
There is no single protein target that is right for every person. Needs vary with body size, age, activity, health, treatment stage and kidney function.
A practical starting point for many midlife adults is around 1.0 to 1.2 grams of protein per kilogram of body weight each day, spread across meals. Some people may be advised to eat more, while others need an individual plan.
Ask for individual advice if you have kidney disease, significant liver disease, frailty, a history of an eating disorder, or persistent difficulty meeting nutritional needs.
Food-first options include eggs, yoghurt, cottage cheese, milk, fish, poultry, lean meat, tofu, tempeh, beans, lentils and other pulses. Protein powders are not essential, but a suitable drink may sometimes help when appetite is low.
Rather than saving most protein for one evening meal, try to include a source at breakfast, lunch and dinner where possible.
Protein is important — but it is not the whole diet
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Fibre
Vegetables, fruit, wholegrains, beans, lentils, nuts and seeds support digestion and help meals remain nutritionally balanced.
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Hydration
Regular fluids matter when appetite is reduced and may help lower the risk of constipation, headaches and dizziness.
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Micronutrients
Variety supports iron, calcium, vitamin B12, folate, iodine and other nutrients relevant to energy, bones and general health.
Avoid cutting out whole food groups without a clinical reason. Small portions still need variety, particularly when treatment means you are eating less overall.
Supplements do not replace food quality. They may be appropriate where there is a diagnosed deficiency or a specific clinical need, but taking more does not automatically improve weight loss or muscle retention.
What counts as strength or resistance work?
Resistance work means making muscles work against a load. It does not require a gym or heavy barbell training.
- sit-to-stands or supported squats;
- wall or worktop press-ups;
- resistance-band rows and presses;
- lifting suitable hand weights or household objects;
- step-ups, stair climbing and controlled lunges;
- reformer Pilates or other Pilates exercises that provide sufficient resistance;
- carrying shopping or other progressively challenging loads safely.
The important principle is progression: as an exercise becomes easy, the resistance, repetitions, range or difficulty usually needs to increase gradually.
UK guidance recommends muscle-strengthening activity on at least two days each week, alongside aerobic movement suited to your health and ability.
Is Pilates enough?
Both reformer and traditional mat Pilates can make a useful contribution to strength, balance, control, posture and mobility.
Whether Pilates provides enough strength work depends on:
- how challenging the exercises are;
- whether the resistance or difficulty increases over time;
- whether all major muscle groups are trained;
- how consistently the sessions are completed.
Reformer Pilates may provide adjustable resistance through the machine’s springs. Mat Pilates can also build strength through body-weight exercises, controlled holds, bands and small weights.
Some people will benefit from adding weights, resistance bands or other progressive strength exercises. Consistency and gradual progression matter more than choosing one “perfect” type of exercise.
What if nausea or fullness makes eating difficult?
When appetite is low, large meals may feel unmanageable. Try smaller portions more often and prioritise the most nutritious part of the meal first.
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Options that may feel easier
Yoghurt, eggs, cottage cheese, fish, tofu, milky drinks, smooth soups with pulses, or a suitable protein drink.
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Adjust how you eat
Eat slowly, stop when comfortably full, avoid very large or high-fat meals, and sip fluids regularly rather than forcing large amounts at once.
This section is not a full guide to treatment side effects.
Read next: Managing Nausea, Constipation and Other Weight-Loss Treatment Side Effects.
Contact your clinical team if you cannot eat or drink enough, are repeatedly vomiting, feel faint or dehydrated, have severe or persistent abdominal pain, or are losing weight much faster than expected.
Practical food principles — without a rigid meal plan
- Include a protein source each time you eat.
- Prioritise protein when appetite is lowest.
- Keep portions small enough to feel manageable.
- Add vegetables, fruit or other fibre-containing foods as tolerated.
- Include some carbohydrate rather than assuming it must be removed.
- Drink regularly through the day.
- Choose foods you can realistically continue eating.
- Review persistent symptoms rather than continually reducing intake.
A rigid meal plan is rarely necessary. The better approach is to adapt familiar foods, protect nutritional quality and make changes that fit your culture, budget, preferences and treatment response.
Why the goal is healthier weight loss, not simply faster weight loss
Progress should consider more than the weekly number on the scales. Useful signs can include improved mobility, preserved strength, better energy, a changing waist measurement, improved blood pressure or blood glucose, and routines that feel sustainable.
This article does not cover the first weeks of treatment, medication comparisons or long-term maintenance in depth.
Looking for weight support that goes beyond the prescription?
LIVVE can review treatment response, appetite, nutrition, menopause symptoms, current medicines and wider health together. The aim is clinically appropriate weight loss that also supports strength, nutrition and long-term wellbeing.
Frequently asked questions
How much protein do I need during weight-loss treatment?
There is no single target that suits everyone. A practical starting point for many midlife adults is around 1.0 to 1.2 grams of protein per kilogram of body weight each day, spread across meals, but needs vary with age, activity, health, body size and kidney function. A clinician or dietitian should advise where there is kidney disease, frailty or difficulty eating.
Can I lose muscle on Mounjaro or Wegovy?
Yes. Any meaningful weight loss can include some lean tissue as well as fat. Eating enough protein and doing regular resistance-based activity can help protect muscle, although no approach can guarantee that none will be lost.
Do I need strength training?
Resistance-based activity is strongly encouraged because it helps maintain strength, muscle and function during weight loss. It does not have to mean a gym. Weights, resistance bands, body-weight movements, stairs and suitably challenging Pilates can all contribute.
What should I eat if I feel full quickly?
Choose small, nutrient-dense meals or snacks and prioritise protein first. Softer options such as yoghurt, eggs, cottage cheese, fish, tofu, soups with pulses or a suitable protein drink may be easier. Persistent difficulty eating or drinking needs clinical review.
Is reformer Pilates enough for strength?
Reformer Pilates can contribute to muscle strengthening when resistance is challenging and increased over time. It may not train every major muscle group sufficiently on its own, so some people benefit from adding weights, resistance bands or other progressive strength work.
