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
Is Coffee Good For Weight Loss?
Coffee contains caffeine, which has been shown in research to have modest effects on metabolism and appetite suppression. Whether coffee is "good" for weight loss depends on how you drink it, your individual response, and how it fits into your overall weight management strategy. This guide explains the science behind coffee and weight loss, and how it compares to other approaches like prescription weight loss medication and lifestyle changes.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 Caffeine Affects Metabolism and Appetite
Caffeine increases metabolic rate slightly — studies show it can increase energy expenditure by approximately 3–11% depending on the amount consumed. A typical cup of black coffee (95–200mg caffeine) may increase calorie burn modestly, though the effect is temporary.
Caffeine also acts as an appetite suppressant by affecting hunger hormones, particularly in the short term. Some research suggests it may reduce food intake by 10–15% in the hours following consumption.
However, these effects are modest and individual responses vary significantly. People who regularly consume caffeine develop tolerance, meaning the appetite-suppressing effect diminishes over time. For sustainable weight management, black coffee can play a small supporting role, but it should not be relied upon as a primary weight loss strategy. Adding sugar, milk, cream, or syrups negates any metabolic benefit and adds significant calories.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
Coffee vs. Evidence-Based Weight Loss Approaches
While coffee has minor metabolic benefits, evidence-based weight loss approaches are far more effective. These include calorie deficit through diet and physical activity, which typically results in losing 0.5–1 kg per week — far greater than coffee alone could achieve.
For adults with a BMI of 30 or above, or 27 or above with weight-related health conditions, prescription weight loss medication may be appropriate. Medications like GLP-1 injections have been shown in clinical trials to help with weight management alongside lifestyle changes. Try our free GLP-1 weight loss calculator to see projected results with prescription medication, and use our BMI calculator to understand your starting point for weight management planning.
- 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 black coffee help weight loss more than regular coffee with milk?
Yes. Black coffee contains only 2–5 calories and delivers full caffeine benefits. Adding milk, cream, or sugar adds 20–100+ calories per cup, which undermines any metabolic advantage. For weight loss, black coffee or coffee with a small splash of milk is preferable.
How much coffee should I drink for weight loss benefits?
Research suggests 2–4 cups of coffee per day (200–400mg caffeine) may provide modest metabolic benefits. Excessive consumption (over 400mg daily) can cause anxiety, sleep disruption, and increased blood pressure. Stick to moderate amounts and avoid consuming coffee late in the day if you struggle with sleep.
Can coffee replace other weight loss strategies?
No. Coffee's effect on weight loss is very modest — approximately 3–11% increase in calorie burn — and develops tolerance quickly. Sustainable weight loss requires a calorie deficit through diet and physical activity. Coffee can support your efforts but should never be your primary strategy.
Is coffee safe for everyone trying to lose weight?
Most adults tolerate moderate coffee well. However, some people are caffeine-sensitive and experience anxiety, palpitations, or sleep problems. If you have heart conditions, high blood pressure, or anxiety, consult your GP before increasing coffee intake. Pregnant women should limit caffeine to under 200mg daily.
How does coffee compare to prescription weight loss medication?
Coffee's effect is minimal compared to evidence-based approaches. Clinical trials show GLP-1 medications like semaglutide (Wegovy) help people lose approximately 15% of body weight alongside lifestyle changes — vastly greater than coffee alone. Prescription medications require clinical assessment and are most effective combined with diet and exercise changes.
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.