Foods that help constipation on Mounjaro

Start here: gentle fibre + fluid

Constipation is common on Mounjaro (tirzepatide). The fix is usually simple: more soluble fibre, plus enough fluid, added gently. Soluble fibre holds water and softens stools. Too much, too fast can bloat you. So build up over a few days and sip water often.

Think soft and moist foods. Oats, chia, ground flax, pears, kiwis, prunes, beans, lentils, cooked veg, live yoghurt and kefir. Pair fibre with fluid at the same meal. Warm drinks can help first thing.

• Add one new fibre food at a time for 2–3 days.
• Drink a glass of water with each fibre-rich snack or meal.
• Keep portions small if your appetite is low. You can eat again later.
• Move a little each day if you can. A short walk can help gut rhythm.
• If you have severe pain, vomiting, fever, blood, or no bowel movement for a week, speak to your prescriber, GP or pharmacist.

Day-by-day plan (simple and gentle)

Use this as a guide. Adjust to your appetite. Repeat days if needed. Keep going with fluids all day. Aim for pale straw-coloured wee.

• Morning, daily: a warm drink. Coffee or tea can help some people. Add breakfast fibre only if you feel ready.
• Days 1–2: add one soft fibre food: 2 kiwis, or 3–4 prunes, or 1 tbsp chia soaked in yoghurt. Keep veg well-cooked and portions small.
• Days 3–4: add oats or cooked barley at one meal. Add a pear or a small bowl of berries later. Keep sipping water.
• Days 5–7: add beans or red lentil soup on one day. Try a kefir or live yoghurt daily. Keep cooked veg with olive oil or yoghurt dressing.
• Ongoing: most days, include one of each: oats or seeds; a prune/kiwi/pear; live yoghurt or kefir; cooked veg; a bean or lentil portion every other day.

Hydrating foods and drinks that help

Fibre needs water to work. Sip through the day, not all at once. Cold or warm both count.

• Water, still or sparkling. Add a slice of lemon or cucumber.
• Milk or unsweetened plant drinks with calcium and iodine. Soya has more protein.
• Kefir or live yoghurt thinned with water to drink.
• Clear soups or broths. A mug before lunch can help.
• High-water foods: melon, oranges, grapes, cucumber, tomatoes, courgette, soups and stews with stock.
• If you add chia, flax or psyllium to foods, drink a glass of water alongside.

Protein that’s kind to your gut (pair with fibre)

You still need protein, even with a small appetite. Choose softer, moist options and pair with fibre and fluid. Protein figures are typical per portion.

Foods that naturally get things moving

These are gentle, everyday picks. Add one or two daily with water.

• Prunes: 3–6 pieces. Or 100ml prune juice, diluted, with water on the side.
• Kiwis: 2 green kiwis, eaten with skin if you like it, helps more.
• Pears or apples: ripe, peeled if your gut is sensitive. Keep them soft by stewing.
• Oats: 30–50g as porridge or overnight oats. Add chia or ground flax.
• Chia seeds: 1 tbsp (about 12g), soaked at least 10 minutes so they gel.
• Ground flaxseed: 1 tbsp (about 10g), in yoghurt or porridge.
• Beans and lentils: start with red lentils or baked beans in small portions.
• Cooked veg: carrots, courgette, spinach, leeks, squash. Add olive oil or yoghurt dressing for softness.

Recipes to try

Breakfast

Overnight oats with prunes, chia and skyr

Soft, creamy oats with soluble fibre and live cultures. Built for small appetites.

24g protein10 minServes 1

You need

• Rolled oats 40g
• Skyr yoghurt 150g
• Semi-skimmed milk 100ml (or soya drink)
• Chia seeds 1 tbsp (12g)
• Prunes 4, chopped
• Honey or maple, 1 tsp (optional)
• Pinch of cinnamon (optional)

Method

1. Mix oats, chia, milk and skyr in a small tub.
2. Stir in chopped prunes and cinnamon. Sweeten if you like.
3. Cover and chill overnight (or at least 4 hours) so the chia gels.
4. In the morning, add a splash of water or milk to loosen if thick. Eat slowly with a glass of water.

Light meal

Red lentil, carrot and leek soup (optional chicken)

A smooth, soothing soup with soluble fibre. Add shredded chicken if you want more protein.

18g protein per portion35 minMakes 2

You need

• Olive oil 1 tbsp
• Leek 1 large, sliced
• Carrots 2 medium, diced
• Red lentils 80g, rinsed
• Low-salt vegetable stock 750ml
• Cooked chicken, shredded 100g (optional)
• Lemon juice 1 tbsp
• Black pepper

Method

1. Soften leek and carrots in oil for 6–8 minutes.
2. Stir in lentils and stock. Simmer 18–20 minutes until soft.
3. Blend smooth or leave a little texture.
4. Stir in chicken if using, warm through.
5. Finish with lemon and pepper. Serve with water or a warm drink.

Breakfast or snack

Kiwi, pear and kefir bowl

Bright, tangy and soft. Gentle fibre with live cultures.

13g protein5 minServes 1

You need

• Kefir 250ml
• Greek-style yoghurt 100g
• Kiwi 2, sliced
• Ripe pear 1/2, diced
• Ground flaxseed 1 tbsp
• Oats 20g

Method

1. Stir kefir and yoghurt in a small bowl.
2. Add oats and let stand 2–3 minutes to soften.
3. Top with kiwi and pear. Sprinkle ground flax.
4. Eat with a glass of water alongside.

What to ease back on when you’re backed up

Some foods can wait until you’re regular again. You don’t have to cut them out forever.

• Very low-fibre meals (plain meat and cheese on their own). Always add veg, fruit or oats.
• Large amounts of bran, raw salads or nuts if you bloat easily. Go slow at first.
• Big servings of white rice, white bread and pastries. Swap for oats, wholegrain toast, or add veg and beans.
• Alcohol. It can dehydrate you.
• Big portions of protein powders without extra fluid. If you use them, add fruit and extra water.

Figures are rounded from typical UK supermarket labels. Check your own packs.

Questions people ask

How much water should I drink when constipated on Mounjaro?

Sip through the day. Have a glass with each meal and snack. Aim for pale straw-coloured wee. Add an extra small glass when you add chia, flax, oats or beans.

Are prunes or kiwis better?

Both work. Prunes help with sorbitol and fibre. Kiwis help with a natural enzyme and fibre. Try 3–4 prunes or 2 kiwis daily for a few days. Pick the one you enjoy and can keep up.

Do I need a fibre supplement?

Not always. Many people improve with oats, prunes, kiwis, chia and cooked veg. If you try psyllium, start small, take it with water, and adjust slowly. If you’re unsure, speak to your prescriber, GP or pharmacist.

What else should I read on Little & Often?

Try: What to eat on Mounjaro or Wegovy: a UK food guide; What to eat on injection day (and the day after); Foods for nausea on Mounjaro: what to eat when you feel sick; High-protein meals when you’re not hungry; High-protein breakfasts for a small appetite; High-protein snacks from UK supermarkets; Foods to avoid on Mounjaro and Wegovy; Free 7-day Mounjaro meal plan; How much protein do I need on Mounjaro? Free UK calculator.

Read next

General food information for adults, not medical advice. Always follow your prescriber's advice about your medication, and speak to your GP, pharmacist or a dietitian about health concerns. Mounjaro, Wegovy and Ozempic are trademarks of their owners; Little & Often isn't connected to them.