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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Can You Eat Peanut Butter When Losing Weight?
Peanut butter can be part of a healthy weight loss plan, but portion control is key. Although peanut butter is calorie-dense and high in fat, it's also rich in protein and fibre, which can help you feel fuller for longer. This guide explains how to include peanut butter sensibly in your weight management UK approach, whether you're making lifestyle changes alone or using prescription weight loss medication alongside diet and exercise. Understanding nutrition is essential for sustainable weight loss.
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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.
Peanut Butter Nutrition and Weight Loss
A typical serving of peanut butter (2 tablespoons or about 32g) contains approximately 190–210 calories, 8–9g of protein, 7g of carbohydrates, and 16–18g of fat. The fat content is mostly unsaturated fat, which is considered healthier than saturated fat. The protein and fibre content is what makes peanut butter useful for weight loss — both nutrients promote satiety, meaning you feel satisfied after eating and are less likely to snack later.
For weight management, measure peanut butter carefully. Using a tablespoon or a measured scoop prevents accidentally consuming double or triple portions. One serving fits comfortably into a reduced-calorie diet, providing around 190 calories. When calculating your daily calorie intake, account for peanut butter alongside other foods to maintain your deficit. Many people find that a small amount of peanut butter on wholemeal toast or with apple slices makes a satisfying snack that prevents overeating later.
- Choose natural peanut butter where possible — lower in added sugar and salt
- Avoid peanut butter labelled as "reduced fat" — often higher in sugar
- Pair peanut butter with high-fibre carbohydrates (wholemeal bread, apple, carrot sticks) to maximise satiety
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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.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Weight Loss Support — Medication and Lifestyle
Peanut butter alone won't cause weight loss, but it can support sustainable weight management as part of a balanced, calorie-controlled diet. The NHS recommends losing weight at a rate of 0.5 to 1 kg per week through a combination of dietary changes and increased physical activity. For some people, prescription weight loss medication — such as GLP-1 injections — can assist when combined with lifestyle changes.
If you're considering prescription weight loss medication, a GP or licensed prescriber will assess your eligibility based on your BMI and health status. Our GLP-1 weight loss calculator can help you explore potential outcomes. Whatever your approach, keeping a food diary (including peanut butter portions) and using our free progress tracker helps monitor what works for you. Small, consistent changes to eating habits are more sustainable than restrictive diets, and including foods you enjoy — like peanut butter in controlled amounts — makes weight loss easier to maintain long-term.
- 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.
How many calories are in a serving of peanut butter?
A standard 2-tablespoon serving (about 32g) of peanut butter contains approximately 190–210 calories. Natural peanut butter and mainstream brands are similar in calories, though natural versions typically have less added sugar and salt. Always check the label on your specific product, as some brands vary slightly.
Is peanut butter good for weight loss?
Peanut butter can support weight loss because it's high in protein and fibre, which help you feel fuller for longer. However, it's calorie-dense, so portion control is essential. One measured serving fits into a reduced-calorie diet, but eating from the jar without measuring can easily exceed your calorie goals.
What's the best way to eat peanut butter while losing weight?
Measure your portion carefully — use a tablespoon or a measured scoop. Pair peanut butter with high-fibre foods like wholemeal bread, apple slices, or carrot sticks to increase satiety. Avoid "reduced fat" versions, which often contain more added sugar. Track your intake in a food diary to stay within your calorie targets.
Can I eat peanut butter if I'm taking weight loss medication?
Yes, peanut butter can be part of your diet while taking prescription weight loss medication like Mounjaro or Wegovy. These medications work best alongside a balanced, reduced-calorie diet and increased physical activity. Your prescriber or a dietitian can advise on portion sizes suitable for your individual plan.
How does peanut butter fit into the NHS weight loss approach?
The NHS recommends a balanced diet with controlled portions of all food groups. Peanut butter fits in as a protein source, but in measured amounts. Use our free BMI calculator to check your current weight status, then focus on sustainable portions of all foods — including peanut butter — to achieve a steady weight loss of 0.5–1 kg per week.
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.