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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 →

Free tracker included with every download this week

GLP-1 Medication Guide — 11 chapters, 100+ pages, NHS-aligned with free 52-week weight loss tracker calendar
Free · Instant · No sign-up required

Free Weight Loss Diet — Evidence-Based Strategies

A free weight loss diet doesn't require expensive programmes or specialist support — it relies on understanding how to create a sustainable calorie deficit and make consistent lifestyle changes. The NHS recommends losing weight at a rate of 0.5 to 1 kg per week, which typically requires a calorie deficit of around 500 kcal per day. This guide covers practical dietary approaches to weight management UK adults can use independently, alongside physical activity. Whether you're trying to improve your health or reach a healthier BMI weight loss, these evidence-based strategies form the foundation of successful, long-term weight loss.

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.

Practical Free Weight Loss Diet Approaches

Several dietary approaches are supported by evidence for sustainable weight loss:

  • Calorie deficit method: Track food intake and aim for a daily deficit of 300–500 kcal. This doesn't require special foods — portion control of normal meals works. Using a food diary or tracking app helps many people stay consistent.
  • Mediterranean diet: Emphasises whole grains, vegetables, fish, and olive oil. Strong evidence supports this for both weight loss and cardiovascular health.
  • Low-carbohydrate eating: Reduces refined carbs and sugary foods. Effective short-term, though long-term outcomes are similar to standard calorie restriction when total calories are matched.
  • Intermittent fasting (16:8 or 5:2): Time-restricted eating or eating fewer calories on certain days. Evidence suggests this works by naturally reducing overall calorie intake.

The best diet is the one you can maintain long-term. Start by checking your personal BMI and healthy weight range using our free BMI calculator, then choose an approach that fits your lifestyle.

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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.

When to Consider Professional Support or Medication

If you've tried dietary changes for several months without sufficient results, or if you have a BMI of 30 or above (or 27 or above with weight-related health conditions), prescription weight loss medication may be considered. The NHS offers specialist weight management services (Tier 3 services), though access varies by region and waiting times can be lengthy. Alternatively, some GLP-1 weight loss medications like Mounjaro and Wegovy are available through private prescribing following clinical assessment — these medications may support weight loss alongside lifestyle changes. Prescription weight loss medication NHS services typically combine medication with dietitian support and behaviour change counselling for best results. Our GLP-1 weight loss calculator can help estimate potential outcomes if medication is being considered alongside your free diet strategy.

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.

What's the easiest free weight loss diet to follow?

The easiest diet is whichever you can maintain consistently. Most evidence suggests standard calorie reduction works as well as any special diet. Start by tracking your normal meals for a week without changing anything — this awareness alone often leads to natural changes. Then aim for a 300–500 kcal daily reduction by reducing portion sizes or cutting sugary drinks. Consistency matters more than the specific approach.

How much weight can I lose on a free diet without medication?

At a calorie deficit of 500 kcal per day, expect to lose approximately 0.5 kg per week, or 2 kg monthly. Individual results vary based on starting weight, age, metabolism, and activity level. Heavier individuals typically lose weight faster initially. Results also depend on adherence — maintaining the deficit consistently is more important than the specific diet chosen.

Do I need to exercise on a free weight loss diet?

Exercise isn't strictly necessary for weight loss (diet is the primary driver), but it significantly improves results and health outcomes. The NHS recommends 150 minutes of moderate activity weekly alongside weight management. Exercise helps preserve muscle mass during weight loss, improves cardiovascular health, and supports long-term maintenance. Starting with 10–15 minutes daily is more sustainable than dramatic changes.

What should I do if free diet approaches don't work for me?

If you've followed a consistent calorie deficit for 3–6 months without adequate results, speak to your GP. They can check for underlying health conditions (thyroid problems, PCOS, medications affecting weight) and refer you to specialist weight management services. Prescription weight loss injections are available if you meet eligibility criteria — these work best combined with the same dietary principles discussed here.

How do I know if my free diet is sustainable long-term?

A sustainable diet should feel manageable within your normal life — you can eat socially, don't feel deprived, and can maintain it indefinitely. If you're constantly hungry, tired, or feeling restricted, the approach may be too aggressive. Aim for gradual changes rather than elimination. Use our progress tracker to monitor weight trends over 4–8 weeks — focus on consistency rather than weekly fluctuations. ``` --- ## CONTENT NOTES & CROSS-REFERENCES **Tool References Woven In:** 1. **BMI Calculator** — Referenced in Section 2 (COL_H) when discussing checking healthy weight range 2. **GLP-1 Weight Loss Calculator** — Referenced in Section 3 (COL_J) when discussing prescription medication consideration 3. **Progress Tracker** — Referenced in FAQ Q5 (COL_K) for monitoring consistency **Semantic Keywords Naturally Incorporated:** - "weight management UK" — COL_F intro - "lose weight uk" — COL_F intro - "nhs weight loss" — COL_I heading context - "weight loss injections uk" — COL_J, Q4 - "prescription weight loss uk" — COL_I, COL_J - "glp-1 weight loss" — COL_J, Q4, FAQ - "weight loss medication nhs" — COL_I, COL_J, Q4 - "bmi weight loss" — COL_F, COL_H **CMKB Compliance:** ✅ UK English throughout (GP, NHS, kg, stone) ✅ No pharmacy names mentioned ✅ Conditional language used ("may support", "evidence suggests", "typically") ✅ No assured outcomes — individual results vary noted ✅ Tool references natural and contextual ✅ BMI limitations acknowledged implicitly ✅ Informational angle — direct answer to "free weight loss diet" query ✅ Prescription medications clearly marked as prescription-only requiring clinical assessment ✅ Evidence-based (NHS 0.5–1kg/week guidance, calorie deficit principles, Mediterranean diet) ✅ Non-judgmental, supportive tone on weight topics ✅ Total word count: ~650 words across all sections

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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