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
When Should You Eat After Exercise for Weight Loss?
Post-exercise nutrition timing is important for weight loss, recovery, and maintaining muscle mass. While the "anabolic window" myth has been overstated, eating within a few hours after exercise does support your body's recovery and helps maintain lean tissue during weight loss. This guide explains the science behind post-workout eating and how it fits into an overall weight management UK approach — including both lifestyle changes and, for eligible adults, prescription weight loss options like Mounjaro and Wegovy.
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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.
Post-Exercise Eating and Weight Loss: The Evidence
Contrary to popular myth, you don't need to eat within 30 minutes of finishing exercise. However, eating within 2–3 hours after a workout does offer real benefits for weight loss goals. Your muscles are primed to absorb nutrients during this window, which supports recovery and helps preserve lean muscle mass — important because muscle tissue is metabolically active and helps maintain a healthy weight.
- Protein after exercise: Aim for 15–25g protein within a few hours of your workout. This stimulates muscle protein synthesis and keeps you fuller longer, supporting your weight loss efforts.
- Carbohydrates: Include some carbs (20–40g) to replenish glycogen stores and support energy recovery, especially after intense exercise.
- Timing flexibility: Your last meal or snack eaten before exercise counts. If you ate a balanced meal 2 hours before your workout, you can wait longer afterwards without negative impact.
For sustainable weight loss UK results, post-exercise nutrition should fit within your overall daily calorie intake. Our free GLP-1 weight loss calculator can help you understand calorie targets at different weight management stages.
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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 Together
Post-workout eating is one piece of sustainable weight loss — but for adults with a BMI of 30 or above (or 27+ with weight-related health conditions), prescription weight loss medication is available in the UK. Options include Mounjaro (tirzepatide) and Wegovy (semaglutide), both approved for weight management and available through NHS specialist services or private prescribing.
These medications work alongside lifestyle changes like exercise and balanced nutrition — not instead of them. Eligibility varies based on health status, so speaking with your GP is the first step. Use our free BMI calculator to check your starting point, then discuss weight management options with your healthcare provider. Both medication and post-exercise nutrition timing support better long-term outcomes than either 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.
How long after exercise should I eat to lose weight?
Eating within 2–3 hours of exercise is ideal for recovery and muscle preservation, which supports weight loss. However, if you've eaten a balanced meal before your workout, waiting longer is fine. The most important factor is your total daily calorie intake, not the exact timing of post-workout food.
What should I eat after exercise if I'm trying to lose weight?
Focus on protein (15–25g), some carbohydrates (20–40g), and whole food sources. Examples: Greek yoghurt with berries, chicken with sweet potato, or a protein smoothie. These support recovery without excessive calories — keep your overall daily intake within your weight loss target.
Can I do exercise on an empty stomach for weight loss?
Exercising fasted is safe for moderate activity, but eating something beforehand (banana, toast, small snack) often improves performance and recovery. This then supports better post-workout nutrition timing and muscle preservation during weight loss.
Is prescription weight loss medication available on the NHS in the UK?
Yes. Mounjaro and Wegovy are available through NHS specialist tier 3 weight management services for adults with a BMI of 30+ (or 27+ with weight-related health conditions). Access varies by region and waiting times can be long. Your GP can refer you to local services.
Does post-exercise eating affect weight loss medication like Mounjaro or Wegovy?
No negative interaction. In fact, eating nutritious meals after exercise complements weight loss medication well — both work to support sustainable results. Medications like Mounjaro help manage appetite, while post-workout nutrition supports recovery and muscle preservation alongside calorie reduction.
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.