GLP-1 and related prescription weight-loss medicines, including Mounjaro, Wegovy and Foundayo, can make you feel fuller sooner, reduce hunger and quieten food noise. That can make portions easier to manage, but it also makes nutritional quality and regular hydration more important.
There is no single official “GLP-1 diet” or special diet for Mounjaro, Wegovy or Foundayo. The most useful approach is usually simple, flexible and based on foods you can tolerate and sustain.
What should I eat on weight loss medication?
Build smaller meals around protein, vegetables or fruit, a high-fibre carbohydrate where tolerated and a modest amount of healthy fat. Eat slowly, stop when comfortably satisfied and drink regularly. Avoid letting appetite become so low that you cannot meet basic food or fluid needs.
Weight-loss treatment should make eating more manageable. The quality and regularity of what you eat still matter, particularly during menopause when protecting muscle, bone and energy is important.
This guide includes Mounjaro, Wegovy, Foundayo and other GLP-1 or related treatments.
The same core nutrition principles apply across these medicines, but product-specific instructions can differ, particularly for oral treatments. For example, Wegovy tablets use a fasting routine, while Foundayo can be taken with or without food. Always follow the instructions for the medicine you have been prescribed.
A simple way to build a balanced meal
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1. Choose protein
Eggs, yoghurt, cottage cheese, chicken, fish, lean meat, tofu, tempeh, beans or lentils.
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2. Add vegetables or fruit
Cooked vegetables may be easier than a large raw salad when bloating or fullness is present.
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3. Include carbohydrates
Oats, potatoes, rice, wholegrain bread, quinoa, beans or fruit, adjusted to appetite and activity.
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4. Add some healthy fat
Olive oil, avocado, nuts, seeds or oily fish. Keep portions modest if high-fat meals trigger nausea or reflux.
There is no universal protein target that suits everyone. Needs vary with body size, age, activity, kidney health and overall intake. For detailed guidance, link to Protein, Muscle and Metabolism During Menopause Weight-Loss Treatment.
How often should I eat?
Some people manage well with three smaller meals. Others need two meals and one or two useful snacks. A regular pattern is often easier than eating nothing all day and then attempting one large meal.
- eat before you become extremely hungry;
- serve a smaller portion first;
- eat slowly and pause during the meal;
- stop at comfortable satisfaction;
- avoid grazing automatically throughout the day.
Do not use appetite suppression as a reason to fast for long periods unless this forms part of an individually agreed plan.
What should I eat when appetite is very low?
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Small breakfast options
Greek-style yoghurt with fruit, eggs on toast, overnight oats or cottage cheese with fruit.
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Small meals
Soup with beans or chicken, a small jacket potato with tuna, an omelette, or fish with cooked vegetables.
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Healthy snacks
Yoghurt, fruit with nut butter, cheese and crackers, a boiled egg, hummus or a small handful of nuts.
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Softer options
Porridge, yoghurt, eggs, soups, stewed fruit or mashed meals can be easier temporarily.
Liquid nutrition or protein supplements should not automatically replace ordinary meals. They may be useful in selected situations, but should be discussed if they become a regular necessity.
Signs you may not be eating enough
- persistent fatigue, weakness or dizziness;
- dark urine or reduced urination;
- hair shedding
- poor recovery from activity;
- regularly missing meals because food feels impossible;
- worsening constipation;
- rapid or ongoing weight loss beyond the agreed plan;
- fear, guilt or anxiety around eating.
These symptoms can have several causes, including dehydration, low intake, iron deficiency, thyroid problems, menopause symptoms or another illness. Contact LIVVE rather than assuming they are normal.
Eating around digestive symptoms
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Nausea or fullness
Try smaller meals, simpler foods and slower eating. Avoid very rich, greasy or large meals.
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Reflux
Keep evening meals modest, remain upright after eating and identify personal triggers such as alcohol, coffee, spicy foods or chocolate.
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Constipation
Drink regularly and increase fibre gradually. Do not add large amounts of fibre if you are severely bloated, vomiting or unable to pass wind.
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Diarrhoea
Prioritise fluids and temporarily choose simpler foods. Seek advice if diarrhoea is repeated, severe or causing dehydration.
For detailed symptom guidance: Managing Side Effects on Mounjaro, Wegovy or Foundayo.
Fluids and fibre
Drink regularly across the day. There is no single fluid target that is safe or necessary for everyone because needs vary with body size, weather, activity, pregnancy, kidney or heart health and other medicines.
Pale-yellow urine is often a useful general sign of hydration, although some medicines and supplements change urine colour. Water, milk, soups and unsweetened drinks can contribute.
Increase fibre gradually through fruit, vegetables, oats, wholegrains, beans, lentils, nuts and seeds. Fibre supplements such as psyllium are not suitable for everyone and require adequate fluid, so ask a pharmacist or clinician before using them regularly.
Are there foods to avoid?
There are no universally forbidden foods, but some choices may worsen symptoms or make it harder to meet your goals:
- large fried, fatty or greasy meals;
- very spicy meals if they trigger reflux;
- fizzy drinks if bloating is troublesome;
- large amounts of sweets, pastries or sugary drinks;
- frequent ultra-processed snacks that displace nutritious food;
- alcohol, particularly if it worsens nausea, sleep, reflux or food choices.
Restriction is not the goal.
A food does not need to be banned because it is higher in calories. Frequency, portion, symptoms and the overall pattern matter
Coffee, alcohol and eating out
Coffee is usually possible, but caffeine can worsen nausea, reflux, anxiety, palpitations or sleep for some people. Do not rely on coffee to replace breakfast, fluids or energy intake.
Alcohol can add calories, worsen dehydration and reduce awareness of fullness. It may be unsuitable with certain health conditions or medicines. Ask LIVVE if unsure.
When eating out, consider a smaller starter-sized meal, share a side, choose grilled rather than fried dishes and stop when comfortably satisfied. You do not need to finish a restaurant portion.
Vegetarian and vegan eating
Plant-based diets can work well, but reduced appetite makes planning more important. Include tofu, tempeh, beans, lentils, edamame, soya products, nuts, seeds and fortified alternatives. Depending on the diet, iron, vitamin B12, calcium, iodine and vitamin D may need attention.
Do not start multiple supplements automatically. A clinician or dietitian can help decide whether dietary changes or testing are more appropriate.
How does eating work with oral weight-loss tablets?
Oral weight-loss tablets do not all have the same administration routine. Wegovy tablets must be taken after the required fasting period, on an empty stomach, with only the permitted amount of water, followed by the specified wait before food, drink or other oral medicines. Foundayo can be taken once daily at any time of day, with or without food.
Do not assume that one weight-loss tablet can be taken in the same way as another. Follow the current product instructions for your prescribed medicine; future oral treatments may have different food, drink or medicine-timing requirements.
Three days of simple meal inspiration
This is not a fixed diet or calorie prescription. Portions should be adjusted to appetite, symptoms, activity and individual clinical needs. Choose smaller amounts where needed and add a snack only if hungry.
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Day 1
Breakfast
Greek-style yoghurt with berries and a spoonful of oats.
Lunch
Lentil and vegetable soup with a small wholegrain roll.
Dinner
Salmon, cooked vegetables and a small portion of potatoes.
Optional snack
Apple slices with peanut butter.
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Day 2
Breakfast
Scrambled eggs on one slice of wholegrain toast.
Lunch
Chicken, tofu or hummus wrap with salad or cooked vegetables.
Dinner
Turkey, lentil or bean bolognese with a modest portion of pasta.
Optional snack
Cottage cheese, yoghurt or a small handful of nuts.
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Day 3
Breakfast
Porridge made with milk or a fortified alternative, topped with banana.
Lunch
Small jacket potato with tuna, cottage cheese or beans.
Dinner
Chicken, tofu or chickpea stir-fry with vegetables and a small portion of rice.
Optional snack
Fruit with yoghurt or cheese and crackers.
Low appetite?
It is fine to divide a meal into two smaller portions or choose softer foods such as yoghurt, eggs, porridge or soup. Contact LIVVE if you are regularly unable to eat or drink enough
How this fits with LIVVE support
This article provides the practical nutrition reference behind your treatment emails. Product-specific emails should continue to cover correct administration, while support emails can prompt patients to:
- eat smaller, balanced meals;
- check food and fluid intake;
- notice foods that worsen symptoms;
- record low appetite, weakness or digestive problems;
- prepare nutrition questions for review.
Do not wait for the next email.
Contact LIVVE sooner if you cannot eat or drink enough, symptoms are worsening or eating is becoming distressing
Find guidance for your prescribed treatment
When should I contact LIVVE?
- you cannot eat or drink enough;
- you are vomiting repeatedly or becoming dehydrated;
- appetite loss is severe or persistent;
- you feel weak, dizzy or unusually fatigued;
- you are losing weight more rapidly than planned;
- constipation, diarrhoea, reflux or nausea is persistent;
- you develop marked hair loss or other signs of under-fuelling;
- treatment is worsening a previous difficult relationship with food.
Need help making food manageable?
LIVVE can review appetite, symptoms, treatment tolerance and the wider plan without expecting perfection or a rigid diet.
Frequently asked questions
What should I eat on weight loss medication?
Aim for smaller, balanced meals built around a good protein source, vegetables or fruit, a high-fibre carbohydrate where tolerated and a modest amount of healthy fat. Eat slowly, drink regularly and focus on nutritional quality rather than simply eating as little as possible.
Do I need to count calories?
Not everyone needs to count calories. Treatment is used alongside a reduced-calorie eating pattern, but strict tracking can be unhelpful or unsuitable for some people. LIVVE can help you focus on portions, meal structure, appetite and sustainable routines.
What should I eat if I am not hungry?
Try small, nutrient-dense meals or snacks rather than waiting for a large appetite. Prioritise fluids and foods that provide protein and other nutrients. Contact LIVVE if you are regularly unable to eat enough, feel weak or dizzy, or become anxious about eating.
Are there foods to avoid on GLP-1 or weight loss medication?
There is no universal banned-food list. Large, greasy, fried, very rich or heavily spiced meals may worsen nausea, reflux or fullness for some people. Fizzy drinks, alcohol and very sugary drinks may also make symptoms or progress harder to manage.
Can I drink coffee?
Coffee is not automatically prohibited, but caffeine may worsen reflux, nausea, palpitations, anxiety or sleep for some people. Avoid using coffee instead of food or fluids. If you use an oral weight-loss tablet, follow its medicine-specific food and drink instructions; Wegovy tablets have fasting requirements, while Foundayo does not use the same fasting routine.
Can I drink alcohol?
Alcohol can add calories, reduce food awareness, worsen reflux or nausea and increase dehydration risk. Some people may also need to avoid it because of liver, pancreas, diabetes or medicine-related concerns. Ask LIVVE what is appropriate for you.
What should I eat on injection day?
There is no special injection-day diet. Eat normally, keep portions modest, drink regularly and avoid very large or rich meals if these tend to trigger symptoms. Do not skip food simply because it is injection day.
How do meals work with oral weight-loss tablets?
The routine depends on the medicine. Wegovy tablets must be taken on an empty stomach after the required fasting period, with only the permitted amount of water, followed by the required wait before food, drink or other oral medicines. Foundayo can be taken once daily at any time, with or without food. Follow the current instructions for your prescribed tablet exactly.
Can vegetarians or vegans eat well on treatment?
Yes. Useful protein sources can include tofu, tempeh, beans, lentils, edamame, soya yoghurt, fortified alternatives, nuts and seeds. Iron, vitamin B12, calcium, iodine and vitamin D may need particular attention depending on your diet.
What if healthy foods make me feel worse?
During nausea, reflux, diarrhoea or constipation, some normally healthy foods may be temporarily difficult to tolerate. Adjust texture, portion size and fibre gradually, then return to a varied diet as symptoms settle. Contact LIVVE if symptoms persist.
