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
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Pancreas Problems and Weight Loss — What You Need to Know
If you have pancreatic problems or concerns about pancreas health, weight loss requires careful consideration and medical guidance. The pancreas plays a crucial role in blood sugar regulation and digestion, and certain weight management approaches—particularly prescription weight loss medications—may require specialist assessment if you have pancreatic disease. This guide explains the connection between pancreatic health and weight loss, including important safety information about GLP-1 medications in the UK.
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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.
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 the Pancreas Affects Weight and Metabolism
The pancreas is a vital organ responsible for producing insulin and digestive enzymes. It directly controls blood sugar levels and how your body processes food. When the pancreas functions properly, it helps regulate appetite and energy balance—both essential for sustainable weight management.
If you have conditions like chronic pancreatitis, pancreatic insufficiency, or a history of acute pancreatitis, weight loss becomes more complex. These conditions can affect how your body absorbs nutrients, making gradual weight management potentially dangerous. Additionally, severe abdominal pain associated with some pancreatic conditions may make physical activity difficult, limiting traditional weight loss approaches.
Your GP should assess your individual pancreatic health before recommending any weight management plan, including prescription medications or significant dietary changes.
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How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
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GLP-1 Medications and Pancreatic Safety in the UK
GLP-1 weight loss medications—including Wegovy (semaglutide) and Mounjaro (tirzepatide)—are prescription-only in the UK and may not be suitable if you have pancreatic disease. These medications slow gastric emptying (how quickly food leaves your stomach) and work on gut hormone pathways, which could theoretically affect pancreatic function.
The UK Medicines and Healthcare products Regulatory Agency (MHRA) requires healthcare providers to screen for pancreatitis risk before prescribing these medications. Warning signs of pancreatitis include severe upper stomach pain radiating to your back, persistent vomiting, and elevated pancreatic enzymes.
If you have any history of pancreatic problems, inform your GP or prescriber immediately. Never start weight loss medication without a full clinical assessment and disclosure of your medical history.
- 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
- 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
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.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, 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.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- 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.
Can I use weight loss injections if I have a history of pancreatitis?
No — a history of acute or chronic pancreatitis is typically a contraindication for GLP-1 medications like Wegovy and Mounjaro. Your prescriber must assess your individual risk. Always disclose any pancreatic disease to your GP before considering prescription weight loss treatment. Non-medication approaches may be safer for your situation.
What are the early warning signs of pancreatitis I should watch for?
Seek urgent medical attention if you experience severe upper abdominal pain (especially radiating to your back), persistent nausea and vomiting, tender abdomen, fever, or rapid heartbeat. These symptoms require immediate GP assessment or emergency care. Do not wait or assume they will pass.
Can I lose weight safely with pancreatic disease?
Yes, but it requires specialist guidance. Your GP or gastroenterologist should design a weight management plan tailored to your pancreatic condition. Safe approaches typically involve gradual calorie reduction, nutrient-rich foods, and medication adjustments if needed. Avoid crash diets or very low-calorie diets without medical supervision.
Is Wegovy safe if my pancreas is healthy?
Wegovy (semaglutide) is a prescription-only GLP-1 medication licensed for weight management in UK adults with a BMI of 30 or above (or 27+ with weight-related health conditions) and no contraindications including pancreatic disease. A clinical assessment is required before prescription. Individual suitability varies—your prescriber will evaluate your full health history.
How does the pancreas affect my BMI and healthy weight range?
The pancreas regulates insulin and blood sugar, which influence hunger, energy levels, and fat storage. Pancreatic dysfunction can make it harder to lose weight or maintain a stable BMI. Use our free BMI calculator to understand your current weight category, and discuss pancreatic considerations with your GP when planning any weight management strategy tailored to your health needs.
Ready to take control of your weight loss journey?
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