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
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When To Eat After Workout For Weight Loss
The timing of your post-workout meal can influence your weight loss results, though the "anabolic window" is less critical than many believe. What matters most is your overall calorie balance and nutrition throughout the day. This guide explains the evidence on post-exercise eating, how it fits into sustainable weight management in the UK, and how to fuel your body effectively whether you're pursuing weight loss through diet and exercise alone or alongside prescription weight loss medication. Use our free BMI calculator to establish your baseline, then track your progress as you combine proper nutrition with consistent activity.
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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-Workout Nutrition and Weight Loss: What the Evidence Shows
Research shows that eating after exercise supports muscle recovery and can help maintain metabolic rate during weight loss — but timing is far less critical than total daily calorie intake. The popular "anabolic window" (30–60 minutes post-workout) is real but much smaller than often claimed; you have flexibility of 1–2 hours for meaningful benefit.
For weight loss specifically:
- A balanced post-workout meal (protein + carbohydrates) supports muscle retention, which preserves metabolic rate
- Eating within 1–2 hours of exercise aids nutrient absorption and recovery
- Protein intake is more important than timing — aim for 20–30g per meal
- Total daily calorie intake remains the most important factor for weight loss
- Dehydration after exercise is common; drink water before eating
The NHS recommends a calorie deficit of 500 kcal per day for sustainable weight loss of approximately 0.5 kg per week. Post-workout nutrition supports this goal by maintaining muscle mass, which keeps your metabolic rate higher during 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.
Practical Post-Workout Meal Ideas for Weight Management
Good post-workout meals balance protein, carbohydrates, and healthy fats without exceeding your daily calorie target. Examples include: Greek yoghurt with berries and granola, chicken with sweet potato and broccoli, tuna sandwich on wholemeal bread, or egg omelette with vegetables. For those pursuing nhs weight loss or working with prescription weight loss medication like GLP-1 injections, post-workout meals should support recovery whilst fitting within your overall eating plan. Track meals using a food diary or app to ensure you're maintaining your calorie deficit. If you're considering weight loss medication such as Mounjaro or Wegovy, these work alongside — not instead of — consistent nutrition and exercise. Calculate your personalised calorie target using our free GLP-1 weight loss calculator to see how post-workout eating fits into your strategy.
- 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.
What should I eat immediately after a workout for weight loss?
Eat a balanced meal within 1–2 hours containing protein (chicken, fish, Greek yoghurt) and carbohydrates (brown rice, sweet potato, wholemeal bread). This supports muscle recovery and keeps your metabolic rate higher during weight loss. Total calories matter most — stay within your daily target.
Is the "anabolic window" real for weight loss?
Yes, but it's overstated. The window is roughly 1–2 hours, not 30 minutes. For weight loss, overall daily nutrition and calorie balance matter far more than exact timing. As long as you eat balanced meals regularly, precise post-workout timing has minimal impact on results.
Can I skip eating after exercise if I'm trying to lose weight?
Not recommended. Skipping post-workout meals can increase muscle loss, slow your metabolism, and leave you overly hungry later, leading to overeating. A modest balanced meal supports sustainable weight loss by preserving lean muscle mass.
How does post-workout nutrition fit with prescription weight loss medication?
Medications like Mounjaro and Wegovy reduce appetite but don't replace nutrition. Balanced post-workout meals ensure adequate protein for muscle recovery and support long-term health. Work with your prescriber or a dietitian to align meals with your medication and calorie goals.
Should post-workout meals differ if I'm on a weight loss injection?
Not significantly. Whether using GLP-1 weight loss medication or not, post-workout nutrition should include protein for recovery and fit within your daily calorie target. GLP-1 medications may reduce portion sizes, so focus on nutrient-dense foods and adequate protein content per 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.