Your appetite has faded. Breakfast doesn’t sound good, and lunch keeps getting pushed back.
By eight in the evening, you notice your day has only included a yoghurt and half a sandwich. Is that good news or a problem?
That’s when most people start wondering how many calories they should be eating on Mounjaro. Find out the answer here, along with your protein count and two meal plans you can follow.
How Many Calories on Mounjaro Does the NHS Suggest?
Mounjaro doesn’t set its own calorie goal. The National Health Service (NHS) suggests:
- Women need about 2,000 calories a day
- Men need about 2,500 calories a day
- To lose weight, cut around 600 calories daily
- This means most women should aim for about 1,400 calories and most men for about 1,900
If you’ve looked up “how many calories should I eat,” 1,400 or 1,900 is where you should start.
Tirzepatide helps reduce your appetite, but it doesn’t change how weight loss works. You still lose weight by eating fewer calories than you burn.
With Mounjaro, reaching that 600-calorie deficit is pretty easy. The challenge is keeping your calorie intake from dropping too low without realising it.
So, aim for 1,400 or 1,900 calories. There’s also a lower number that’s important to know, and it’s one that people often overlook.
How Low Can Your Daily Calories Go?
Most guidance points to 1,200 calories a day for women and 1,600 for men. When people ask how few calories they should eat while taking Mounjaro, these are the figures they want.
Dietitians and weight management programmes use them as working minimums. Check with your prescriber or a dietitian before you drop this low. They can confirm the right minimum for your body.
A 900-calorie day can't provide enough protein, fibre, vitamins and minerals. Eating so few calories can make it hard to lose weight safely.
Adjust the Minimum for Your Body Weight
Your minimum needs depend on your size. A 95 kg body burns more calories at rest than a 60 kg body, so it needs more food.
Think of 1,200 and 1,600 as starting points. Increase them if you're tall or weigh more than average.
Are You Eating Too Little on Mounjaro?
On Mounjaro, not eating enough hides behind steady weight loss. The number keeps falling, so nothing seems wrong.
Losing weight quickly while not getting enough protein can lead to losing more muscle. Low protein intake is often linked to GLP-1 medications.
Muscle gives you strength and burns energy even when you’re resting. If you lose too much muscle, you might feel weaker even if your weight stays the same.
Signs You’re Eating Too Little
People often notice a few of these:
- Feeling tired even after a full night’s sleep
- Struggling with stairs or carrying shopping bags
- Thinning hair
- Feeling flat or irritable
Other issues can cause these symptoms too. Use them as a reminder to check what you’ve eaten this week.
When to Call Your Prescriber
Call your prescriber if you’ve been eating below your minimum for several days. Reach out sooner if you’re vomiting or have diarrhoea and can’t keep fluids down, or if the weakness doesn’t go away.
How Much Protein Should You Eat on Mounjaro?
Multiply your weight in kilograms by 1.2 to 2.0 to find your daily protein target in grams.
Calculate Your Protein Needs
Before you multiply, divide your weight in kilograms by the square of your height in metres. That gives you your body mass index (BMI).
If your BMI is under 30, multiply what you weigh now. At 30 or above, multiply your goal weight so you don't overshoot your needs.
- For a 70 kg person with a BMI under 30: 84 g to 140 g of protein a day
- For a 90 kg person with a BMI under 30: 108 g to 180 g a day
- For a 100 kg person with a BMI of 30 or above and a 75 kg goal weight: 90 g to 150 g a day
Use your current weight for this calculation. If you have a higher body mass index (BMI), your doctor might suggest using an adjusted weight, so check with them.
Which Target to Aim For
The lower end suits general health. While you’re losing weight, aim for around 1.6 g per kilogram to help keep muscle. Move towards 2.0 g per kilogram if you lift weights as well.
Spread It Out Throughout the Day
Your appetite might decrease later in the day, so saving all your protein for dinner isn’t the best idea. Try to have three or four servings of protein throughout the day. Aim for 25 g to 40 g at each meal.
What Else Goes on Your Plate?
Protein is just one part of your daily diet. Fibre, fruits, vegetables, and starchy foods make up the rest.
Fibre and Your Digestion
The UK government recommends getting 30 g of fibre a day, but most adults only get about 20 g. Constipation is a common issue with this medication. Make sure to eat plenty of fibre if that happens.
Foods to Eat on Mounjaro
Fruits and vegetables for volume, colour, vitamins, and minerals
- Oats, brown rice, and potatoes for steady energy
- Dairy or alternatives for calcium
- A tablespoon of olive oil, nut butter, or avocado with your main meals
- Kefir, natural yoghurt, kimchi, or sauerkraut, which can help settle your stomach
Eating small snacks during the day can help if you're feeling nauseous. You can also try bland foods like toast or crackers.
Heavy, greasy meals can make nausea worse, so it's best to avoid those on Mounjaro. It’s also recommended to take a daily multivitamin since you might not be eating much.
What 1,200 and 1,600 Calories Look Like on a Plate
Here are two days that meet the minimums and protein targets from the sections above. Copy them, or swap in foods with a similar amount of protein.
A 1,200-Calorie Day for Someone Weighing 70 kg
- Breakfast: Protein smoothie with berries and oats, 35g protein
- Lunch: Chicken and lentil soup with wholemeal bread, 30g protein
- Snack: Greek yoghurt with seeds, 20g protein
- Dinner: Salmon, new potatoes and green vegetables, 35g protein
The daily total is about 120g of protein and 30g of fibre (1.7g of protein per kilogram).
A 1,600-Calorie Day for a 90 kg Body
- Breakfast: Cold-pressed juice with banana, oats and nut butter, 45g protein
- Lunch: Chicken, quinoa and roasted vegetable bowl, 40g protein
- Snack: Cottage cheese with fruit, 25g protein
- Dinner: Lean beef, sweet potato and broccoli, 40g protein
- Evening: Kefir or a glass of milk, 15g protein
Daily total is about 165g of protein, 30g of fibre, and 1.8 grams of protein per kilogram.
Get Your Meals Ready in Advance
Cook in batches on the weekend and put them straight into containers. Keep boiled eggs, nuts, and cottage cheese handy for those nights when you don’t feel like cooking.
Having a Mounjaro meal plan in the fridge means you won’t have to decide what to eat at seven in the evening.
Get Your Protein and Fibre From EXALT When Appetite Drops
Some days none of this appeals, and the smell of cooking puts you off.
EXALT put together the 7-Day GLP-1 Nutrition Support Plan for the roughest weeks. It comes in a 1,200-calorie version and a 1,600-calorie version, matching the two calorie levels mentioned above.
A registered clinical dietitian designed it. EXALT provides up to 170 g of protein and 30 g of fibre a day from cold-pressed whole ingredients, with whey, vegan, and collagen options.
The plan works best in your roughest weeks. Nausea is most common during the first few weeks and can flare after every dose increase; that’s why many customers time delivery around injection day.
Once your body adjusts to the dose, you can move to a lighter routine. Drink smoothies for breakfast, lunch, and snacks, then cook a balanced evening meal.
Talk to your prescriber or a dietitian before you cut back any further. Then you'll know how many calories your body needs while taking Mounjaro, and you'll have a simple way to hit that number.
