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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Healthy Low Calorie Snacks For Weight Loss
Smart snacking plays an important role in weight management UK. Rather than skipping snacks entirely, choosing low calorie options can help prevent overeating at main meals, stabilise blood sugar, and keep energy steady throughout the day. This guide covers evidence-based snack choices, portion sizes, and how healthy snacking fits into sustainable weight loss alongside dietary changes and increased physical activity.
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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.
Best Low Calorie Snacks For Weight Loss
The best low calorie snacks combine protein, fibre, and water content — these nutrients help you feel fuller for longer. Aim for snacks between 100–150 calories to avoid disrupting your calorie balance.
- Fruit: Berries (strawberries, blueberries), apples, oranges — naturally sweet and high in fibre
- Vegetables: Carrots, celery, cucumber, peppers with hummus or Greek yoghurt dip
- Protein: Plain Greek yoghurt, cottage cheese, hard-boiled eggs, unsalted nuts (small handful)
- Whole grains: Oatcakes, wholemeal crackers with cheese or peanut butter
- Drinks: Water, herbal tea, black coffee — zero calories and help with hydration
Evidence shows that protein-rich snacks are especially effective for weight loss because they reduce appetite more than carbohydrate or fat snacks alone. A small pot of Greek yoghurt with berries, for example, provides protein, fibre, and natural sweetness in around 120 calories.
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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.
Snacking Strategy For Weight Loss
Successful weight loss isn't about perfection — it's about sustainable choices. Plan snacks in advance to avoid reaching for high calorie options when hungry. Use our free BMI calculator above to establish your current weight baseline, then track progress over weeks as you build consistent eating habits.
If you're exploring prescription weight loss options like GLP-1 medications (used in weight loss injections uk), snacking patterns may naturally change because these medications reduce appetite. Even so, when you do snack, choose nutrient-dense options. Our GLP-1 weight loss calculator can help project potential weight loss outcomes with medication support, while maintaining healthy eating habits alongside treatment.
Remember: sustainable weight loss typically occurs at 0.5–1 kg per week. Small snack adjustments, combined with portion control at main meals and increased activity, build momentum over time.
- 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 many calories should a healthy snack contain?
Aim for 100–150 calories per snack to maintain a calorie deficit without excessive hunger. This depends on your total daily intake — your GP or a registered dietitian can advise your personal calorie needs. Use our free BMI calculator to understand your baseline health metrics.
Are nuts and seeds good low calorie snacks?
Yes, but portion control matters. A small handful (around 30g) of unsalted nuts contains 160–180 calories and excellent protein, fibre, and healthy fats. Pre-portion them into small bags to avoid overeating. They're far better than processed crisps for sustainable weight management uk.
Can snacking help with weight loss?
Yes — smart snacking prevents overeating at main meals, stabilises blood sugar, and maintains energy. The key is choosing low calorie, nutrient-dense options and eating mindfully. Skipping snacks entirely often backfires, leading to hunger-driven binges.
What snacks should I avoid when losing weight?
Limit highly processed snacks: crisps, biscuits, chocolate bars, sugary drinks, and pastries. These are calorie-dense but low in satiety — you don't feel full despite consuming many calories. Water-rich, fibre-rich, protein-rich snacks are far more effective for weight loss.
Do snacking patterns change with weight loss medication?
Yes — GLP-1 weight loss injections reduce appetite naturally, so many people eat smaller snacks or skip them entirely. When snacking does occur, nutrient-dense choices remain important. Always follow your prescriber's guidance on eating habits while taking any prescription weight loss medication nhs services recommend.
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.