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
Free tracker included with every download this week
Can Amino Acids Help You Lose Weight?
Amino acids are the building blocks of protein, and protein plays an important role in weight management. Whilst amino acids alone won't cause weight loss, they can support your efforts when combined with a calorie deficit and increased physical activity. This guide explores what the evidence says about amino acids, how protein affects weight loss, and how they fit into an overall weight management strategy aligned with NHS guidance.
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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.
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 Amino Acids Support Weight Management
Amino acids contribute to weight loss primarily through their role in protein metabolism. When you consume protein, your body uses more energy to digest it compared to fats or carbohydrates — an effect called the thermic effect of food (TEF). This means eating adequate protein slightly increases your calorie burn throughout the day.
Protein and amino acids also help preserve muscle mass during weight loss. When you're in a calorie deficit, your body can break down muscle tissue for energy. Adequate protein intake — especially the branched-chain amino acids (BCAAs) leucine, isoleucine, and valine — signals to your body to preserve muscle and use fat stores instead. This matters because muscle is metabolically active; preserving it keeps your metabolic rate higher.
Additionally, protein increases feelings of fullness and satiety. Eating protein-rich foods helps you feel satisfied after meals, potentially reducing overall calorie intake without deliberate restriction. This is why the NHS emphasises adequate protein intake as part of sustainable weight loss.
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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.
Amino Acids Versus Weight Loss Medication
Amino acids and protein are fundamental to healthy weight loss, but they work very differently from prescription weight loss medications. Whilst eating enough protein supports your metabolism and helps you feel full, GLP-1 medications like Wegovy and Mounjaro work through different mechanisms — they mimic hormone pathways that directly signal to your brain to reduce hunger and cravings.
The most effective weight loss approach combines all of these elements: adequate protein intake, a calorie deficit, increased physical activity, and — if clinically appropriate — prescription weight loss medication. Try our free GLP-1 weight loss calculator to see how prescription options might complement your dietary efforts. You can also use our BMI calculator to track whether your protein-focused weight loss plan is moving you towards a healthier weight range.
- 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.
Which amino acids are best for weight loss?
Branched-chain amino acids (BCAAs) — leucine, isoleucine, and valine — are highlighted in research for preserving muscle during weight loss. However, all amino acids (from complete proteins like chicken, fish, eggs, beans, and dairy) support weight loss when part of an overall calorie deficit. Focus on eating enough protein rather than supplementing individual amino acids.
How much protein should I eat to lose weight?
The NHS recommends around 0.8g of protein per kg of body weight daily for general health. For weight loss, some evidence suggests 1.2–1.6g per kg may help preserve muscle. For personalised guidance, consult your GP or a registered dietitian. Use our BMI calculator to track your progress.
Can amino acid supplements alone cause weight loss?
No. Amino acid supplements contain no calories on their own and won't create the calorie deficit needed for weight loss. They may support muscle preservation within a calorie deficit, but supplements are not a weight loss solution. Diet and physical activity remain the foundation.
Are amino acids better than weight loss medication?
They work differently. Protein supports your metabolism and satiety naturally; prescription weight loss medication reduces appetite through hormone pathways. The most effective approach combines adequate protein, calorie deficit, exercise, and — if clinically appropriate — prescription options. Your GP can advise which is right for you.
Do amino acids affect how GLP-1 weight loss injections work?
There's no direct conflict. If you're prescribed Wegovy or Mounjaro, maintaining adequate protein intake is still important to preserve muscle during weight loss. The medication handles appetite suppression; protein helps maintain lean mass. Discuss your diet with your prescriber.
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.