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
What Is Magnesium Good For Weight Loss?
Magnesium is an essential mineral that plays many roles in your body, including regulating blood sugar, supporting metabolism, and helping muscles function properly. While magnesium won't directly cause weight loss on its own, evidence suggests it may support weight management by improving insulin sensitivity, reducing inflammation, and helping regulate appetite hormones. Many people in the UK are deficient in magnesium, which can affect metabolism and weight control. Understanding how this mineral works and whether you need more of it is an important part of a holistic approach to weight management alongside diet and exercise.
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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 Magnesium Supports Weight Management
Magnesium supports weight management through several mechanisms. First, it helps regulate blood sugar levels and improves insulin sensitivity—when insulin works more effectively, your body is less likely to store excess energy as fat. Second, magnesium plays a role in appetite regulation by influencing hormones that signal hunger and fullness. Third, adequate magnesium levels support metabolic function—without enough magnesium, your metabolism may slow down, making weight loss harder.
Research also suggests magnesium may reduce cravings for sugary foods and support better sleep quality, which is crucial for weight management. Poor sleep disrupts hormones like cortisol and leptin, making weight loss more difficult. Additionally, magnesium has anti-inflammatory properties, and chronic inflammation is linked to weight gain and metabolic dysfunction. However, magnesium alone won't cause weight loss—it works best as part of a balanced approach that includes a reduced-calorie diet, physical activity, and other lifestyle 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.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Magnesium and Prescription Weight Loss Treatment
If you're exploring weight loss medication nhs options like GLP-1 injections (Mounjaro or Wegovy), magnesium becomes even more relevant. These prescription-only weight loss injections can sometimes affect digestion and nutrient absorption, making adequate mineral intake important. Some people taking GLP-1 weight loss injections report nausea or constipation—magnesium may help with both by supporting digestive health.
Before starting any prescription weight loss treatment, your GP or prescriber will assess your overall health, including nutritional status. If you're considering combining magnesium supplementation with weight loss medication, always inform your prescriber, as magnesium can interact with certain medications. A balanced approach—combining dietary changes, physical activity, and when appropriate, prescription treatment alongside proper nutrition—is more effective for sustainable weight loss than any single approach alone.
- 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.
Does magnesium directly cause weight loss?
No. Magnesium won't cause weight loss on its own, but it supports processes that make weight loss easier—like regulating blood sugar, reducing cravings, and improving sleep quality. Weight loss requires a calorie deficit alongside healthy habits. Using our free BMI calculator can help you track where you stand and set realistic goals.
How much magnesium do I need for weight management?
The NHS recommends 300 mg daily for adult men and 270 mg daily for adult women. Most people can meet this through foods like leafy greens, nuts, seeds, and whole grains. If you think you're deficient, speak to your GP before supplementing, as excess magnesium can cause digestive issues.
Can magnesium help if I'm taking weight loss injections?
Magnesium may help support overall health whilst taking GLP-1 weight loss injections like Mounjaro or Wegovy, but always inform your prescriber about any supplements. They'll advise whether supplementation is appropriate for you and whether it interacts with your medication.
What are signs of magnesium deficiency?
Low magnesium can cause muscle cramps, fatigue, poor sleep, mood changes, and increased cravings for sugar or salt. If you suspect deficiency, consult your GP—they can test magnesium levels and recommend dietary changes or supplements if needed.
Is magnesium supplementation safe for weight loss?
Magnesium supplements are generally safe, but high doses can cause digestive side effects. The safest approach is getting magnesium from food first, then supplementing only if your GP recommends it. Always consult your healthcare provider before starting supplements, especially if you're on other medications.
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.