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
Which Carbohydrates Are Best for Weight Loss?
Not all carbohydrates are equal when it comes to weight loss. The best carbohydrates for weight loss are those high in fibre, low on the glycaemic index (GI), and nutrient-dense — they keep you fuller for longer and support stable blood sugar. This guide explains which carbs to prioritise, why they matter for weight management in the UK, and how they fit into a sustainable weight loss plan alongside other lifestyle changes.
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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.
Low-GI and High-Fibre Carbohydrates for Sustainable Weight Loss
The best carbohydrates for weight loss are those with a low glycaemic index and high fibre content. These carbs digest slowly, keeping blood sugar stable and appetite controlled — crucial for sustainable weight loss. Examples include:
- Oats — whole grain, high in soluble fibre, keeps you full for hours
- Wholemeal bread — more fibre than white bread, steadier energy release
- Sweet potatoes — nutrient-dense, high in resistant starch
- Legumes — beans, lentils, chickpeas — high in both fibre and protein
- Brown rice — lower GI than white rice, sustained energy
- Quinoa — complete protein, slow carbohydrate digestion
Refined carbohydrates like white bread, sugary cereals, and processed snacks cause rapid blood sugar spikes followed by crashes, triggering hunger and cravings. Replacing these with low-GI alternatives supports nhs weight loss goals by reducing overall calorie intake naturally.
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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.
Carbohydrates and Weight Management — What the Evidence Shows
Research shows that carbohydrate quality matters more than quantity for weight management uk. Studies published in nutrition journals confirm that people who prioritise high-fibre, low-GI carbs lose more weight sustainably than those on very low-carb diets. Fibre is particularly important — it increases satiety (fullness), slows gastric emptying, and supports digestive health. Aim for at least 30g of fibre daily through carbohydrate sources like vegetables, whole grains, and legumes.
Use our free BMI calculator above to track how these dietary changes affect your weight, and our progress tracker to log your eating patterns and weight loss journey. For additional support, prescription weight loss medication may be considered — discuss with your GP whether this is appropriate for you.
- 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.
Are carbohydrates bad for weight loss?
No. Carbohydrates aren't inherently bad for weight loss — the type and quantity matter. Low-GI, high-fibre carbohydrates support weight loss by keeping you full and stable. Refined carbohydrates cause rapid blood sugar spikes and hunger, making them harder to control during weight loss. Focus on whole grains, legumes, and vegetables rather than avoiding carbs entirely.
What's the glycaemic index (GI) and why does it matter?
The GI measures how quickly carbohydrates raise blood sugar. Low-GI foods (under 55) digest slowly and keep energy stable, supporting appetite control. High-GI foods spike blood sugar quickly, followed by crashes that trigger hunger and cravings. For weight loss, prioritise low-GI options like oats, sweet potatoes, legumes, and wholemeal bread over white bread, white rice, and sugary foods.
How much fibre should I eat for weight loss?
Aim for at least 30g of fibre daily. Fibre increases fullness, slows digestion, and helps regulate blood sugar — all crucial for weight loss. Good sources include vegetables, legumes, whole grains, nuts, and seeds. Increase fibre gradually over a week or two to avoid digestive discomfort. Our progress tracker can help you log dietary changes and see results over time.
Can I lose weight while eating carbohydrates?
Yes. Weight loss requires a calorie deficit, not carbohydrate elimination. You can lose weight eating carbohydrates if you choose the right types (high-fibre, low-GI) and manage overall portions. Sustainable lose weight uk approaches include carbohydrate-based meals with protein and vegetables. Consult your GP or a registered dietitian for personalised advice, especially if you're considering prescription weight loss uk medication alongside dietary changes.
Should I use a low-carb diet for faster weight loss?
Very low-carb diets can cause rapid initial weight loss, but most of this is water, not fat. Evidence suggests that moderate carbohydrate intake (with emphasis on low-GI, high-fibre options) supports more sustainable long-term weight loss than eliminating carbs entirely. gradual weight management can also increase muscle loss. The NHS recommends a balanced approach with whole grains, protein, and vegetables at every meal.
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.