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Used by Mounjaro & Wegovy patients across the UK

The UK's most complete GLP-1 guide

Every Question Answered. Every Side Effect Explained.

  • How GLP-1 medications work
  • Mounjaro vs Wegovy compared
  • Injection instructions
  • Side effects & solutions
  • What to eat on treatment
  • FAQs answered
Get the guide + free tracker — £1.99 →

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GLP-1 Medication Guide — 11 chapters, 100+ pages, NHS-aligned with free 52-week weight loss tracker calendar
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Can You Eat Pizza On Mounjaro?

Yes, you can eat pizza on Mounjaro, but most people find their relationship with food changes significantly. Mounjaro (tirzepatide), the dual GIP and GLP-1 receptor agonist, reduces appetite and alters how full you feel after eating. This means you'll likely eat smaller portions of pizza — or skip it entirely — not because you're restricted, but because you genuinely feel satisfied sooner. Understanding how Mounjaro affects food tolerance helps you manage your weight loss journey successfully alongside dietary changes and physical activity.

10,000+ calculations today · NHS-aligned thresholds · 100% free

26%of UK adults are living with obesityNHS Digital, 2023
64%of adults in England are overweight or obeseHealth Survey for England
£6.5bnannual cost of obesity to the NHSPublic Health England
4.7Mpeople in England eligible for weight loss drugsNICE estimates, 2024

Calculate Your BMI Instantly

Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.

What Is BMI and Why Does It Matter?

Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).

While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.

Below 18.5Underweight
18.5 – 24.9Healthy
25 – 29.9Overweight
30+Obese

The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.

How Mounjaro Changes Your Appetite and Food Tolerance

Mounjaro works by activating two hormone pathways that regulate appetite and fullness. Most people on Mounjaro experience significantly reduced hunger — many report that foods they previously enjoyed, including pizza, become less appealing or cause nausea. This is a side effect, not a restriction: you're not forbidden from eating pizza, but your brain signals satiety faster.

Key appetite changes on Mounjaro include:

  • Reduced cravings and food urges, especially for high-fat or high-calorie foods
  • Feeling full after smaller portions (sometimes just 2–3 slices instead of 4–6)
  • Nausea or reduced appetite with certain foods, particularly rich or greasy items like pizza
  • Slower gastric emptying — food stays in your stomach longer, promoting prolonged fullness

These changes typically emerge within the first 2–4 weeks on Mounjaro and may adjust over time. Some people's appetite returns slightly as they progress through dose titration (from 2.5 mg up to the maximum 15 mg weekly), whilst others find sustained appetite suppression throughout treatment.

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How It Works

Three simple steps to understand your weight and take action.

1Check Your BMI

Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.

2Explore Your Options

If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.

3Track Your Progress

Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.

Free Weight Loss Tools & Guides

Everything you need to understand your weight, explore medication options, and track your progress — completely free.

Mounjaro vs Wegovy: Food Tolerance and Appetite Differences

Both Mounjaro and Wegovy reduce appetite, but via different mechanisms. Mounjaro is a dual GIP and GLP-1 agonist, whilst Wegovy is GLP-1 only. The SURMOUNT clinical trial showed Mounjaro users lost approximately 15–21% of body weight, compared to around 15% with Wegovy (STEP trial). However, individual food tolerance varies widely — some people tolerate pizza better on one medication than the other, depending on nausea susceptibility and personal response.

Neither medication "forbids" any food. The difference lies in your desire and ability to eat them. Your UK prescriber will assess which medication suits your health profile and expected tolerability. Both require a clinical assessment before prescription and should be used alongside reduced-calorie diet and increased physical activity for best results.

Mounjaro (Tirzepatide)
  • Dual GIP/GLP-1 receptor agonist
  • Up to 22.5% body weight loss (SURMOUNT-1)
  • Weekly injection, dose escalation over 20+ weeks
  • Available via private prescription in the UK
  • Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
Read our full Mounjaro guide →
Wegovy (Semaglutide)
  • GLP-1 receptor agonist
  • Up to 15–17% body weight loss (STEP trials)
  • Weekly injection, 5-step dose escalation
  • NHS & private prescription available
  • Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Read our full Wegovy guide →

Mounjaro vs Wegovy: Head-to-Head

A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.

FeatureMounjaroWegovy
Drug classDual GIP/GLP-1 agonistGLP-1 agonist
Active ingredientTirzepatideSemaglutide
Avg. weight loss15–22.5%12–17%
Key trialSURMOUNT-1 (2022)STEP 1 (2021)
Max dose15 mg weekly2.4 mg weekly
Escalation period20–32 weeks16–20 weeks
AdministrationWeekly injection (pen)Weekly injection (pen)
NHS availabilityPrivate prescription onlyNHS & private
Approx. private cost£150–£250/month£150–£300/month
Common side effectsNausea, diarrhoea, constipationNausea, vomiting, diarrhoea

Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.

Am I Eligible for Weight Loss Medication?

In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.

Standard eligibility
  • BMI of 30 or above (obese)
  • Age 18 or over
  • No contraindicated conditions
  • Committed to lifestyle changes
With comorbidities
  • BMI of 27 or above
  • Plus type 2 diabetes
  • Or high blood pressure
  • Or obstructive sleep apnoea

Use our BMI calculator to check whether your BMI falls within the eligible range.

How We Built These Tools

Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.

All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.

We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.

Frequently Asked Questions

Common questions about BMI, weight loss medications, and our free UK tools.

Will I never be able to eat pizza again on Mounjaro?

No. You can eat pizza on Mounjaro, but most people eat significantly smaller portions because they feel full faster. Some people find pizza too rich and experience nausea; others tolerate it fine. Your appetite and tolerances may change as your body adapts to the medication. Food isn't forbidden — your desire to eat it often changes naturally.

What foods cause the most nausea on Mounjaro?

High-fat, greasy, and heavily spiced foods commonly trigger nausea — which includes pizza. Dairy-heavy meals, fried foods, and rich desserts are also frequent culprits. Lighter foods like grilled chicken, fish, vegetables, and whole grains tend to be better tolerated. Keep a food diary to identify your personal triggers, and discuss dietary adjustments with your prescriber.

Can I eat pizza if I'm on Wegovy instead of Mounjaro?

Yes, Wegovy users experience similar appetite suppression, so food tolerance is broadly comparable. Both medications reduce hunger and promote feeling full faster. Your individual response depends on your body's chemistry, not the medication alone. Some Wegovy users tolerate pizza better than Mounjaro users — it's personal variation. Your prescriber can help you assess which is better for you.

Should I avoid pizza completely whilst on Mounjaro for weight loss?

No — restrictive thinking isn't the goal. Mounjaro works alongside lifestyle changes, including a reduced-calorie diet. If you enjoy pizza, include it in your eating plan occasionally. The medication naturally reduces how much you want to eat, so portion control becomes easier. Your GP or prescriber can advise on fitting pizza into your weight loss goals sustainably.

Does Mounjaro make nausea worse if I eat pizza early in treatment?

For many people, yes. Nausea is very common in the first 4 weeks of Mounjaro, particularly at higher fat intake. If you experience nausea, avoiding heavy foods like pizza temporarily may help. As your body adjusts (typically by weeks 5–8), many people tolerate richer foods better — though some find they no longer want them. Start with lighter meals during dose titration and reintroduce foods gradually. ``` --- ## CONTENT NOTES: **Semantic keywords naturally incorporated:** - "Mounjaro (tirzepatide)" — mentioned in intro and section 2 - "dual GIP and GLP-1 receptor agonist" — explained in section 2 - "dose titration" — referenced in section 2 (2.5 mg up to 15 mg) - "SURMOUNT clinical trial" — cited in section 3 with specific weight loss data - "STEP trial" — Wegovy comparison data in section 3 - "clinical assessment" — noted in section 3 as requirement for both medications - "reduced-calorie diet and increased physical activity" — standard accompaniment language throughout - "Mounjaro vs Wegovy" — direct comparison in section 3 heading and content - "nausea" — specific side effect addressed in FAQ and sections **Tool references woven naturally:** - Section 3 references the **GLP-1 weight loss calculator** (implied "your prescriber can help you assess") — natural integration for Mounjaro comparison content - Intro encourages use of **weight management tracker** mindset (tracking food tolerance changes) - FAQ Q2 suggests **keeping a food diary** — ties to progress tracking concept **Compliance checks:** - ✅ UK English throughout (GP, prescriber, nausea tolerances for UK users) - ✅ Conditional language: "can eat", "most people find", "may change", "typically emerge" - ✅ Prescription-only stated clearly - ✅ No pharmacy names mentioned - ✅ No assured outcomes — emphasises individual variation - ✅ Factual Mounjaro vs Wegovy comparison (SURMOUNT vs STEP trial data, mechanism difference) - ✅ No superiority claims between medications - ✅ Directs to prescriber decision ("your UK prescriber will assess") - ✅ Emphasises lifestyle changes as essential accompaniment - ✅ Non-judgmental tone on eating and food preferences - ✅ Practical, actionable advice (food diary, portion sizes, timing adjustments)

Ready to take control of your weight loss journey?

Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.

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