The Science Behind Orlistat - Why It Works
How Orlistat Blocks Fat Absorption
Orlistat works through a scientifically proven mechanism that targets lipase enzymes in your digestive system. These enzymes normally break down dietary fats so they can be absorbed into your body. When you take orlistat, it inhibits approximately one third of these lipase enzymes, preventing the breakdown and absorption of roughly one third of the fat you consume. The unabsorbed fat passes naturally through your system and is excreted.
This local action in the gut means orlistat doesn't affect your brain chemistry like appetite suppressants. Instead, it works directly where fat digestion occurs, making it a targeted approach to reducing calorie intake from dietary fat.
Three Orlistat Options Available
Understanding how orlistat works helps you choose the right option. Alli 60mg capsules (£28.99 for 4 weeks, £26.09 with EDM10) provide the lower-strength version, blocking a smaller proportion of dietary fat. For prescription strength, generic Orlistat 120mg offers the most cost-effective option at £32.99 for 4 weeks (£29.69 with EDM10). Branded Xenical 120mg provides the same clinical effect at £42.99 for 4 weeks (£38.69 with EDM10).
All three contain the same active ingredient - orlistat - but at different strengths and prices to suit individual preferences and budgets.
Why This Mechanism Supports Weight Loss
The fat-blocking mechanism works because dietary fat contains 9 calories per gram - more than twice the calories of protein or carbohydrates. By preventing approximately one third of dietary fat absorption, orlistat can significantly reduce your calorie intake when used alongside a lower-fat diet. This calorie reduction supports the energy deficit needed for weight loss.
Clinical studies demonstrate this mechanism's effectiveness when combined with dietary changes. The key is maintaining a reduced-calorie, lower-fat diet - ideally no more than 15g fat per meal - to maximise benefits while minimising gastrointestinal side effects.
What Happens to Blocked Fat
The approximately one third of dietary fat that orlistat blocks doesn't disappear - it passes through your digestive system unchanged. This is why orlistat can cause oily stools, urgent bowel movements, and oily spotting, particularly when meals are high in fat. These effects are actually proof the mechanism is working.
Keeping fat intake low (around 30% of daily calories spread across three meals) significantly reduces these side effects while maintaining the weight loss benefits. Many patients find effects diminish as they adapt to a lower-fat eating pattern.
Order Your Orlistat Treatment Today
Now you understand how orlistat's proven fat-blocking mechanism works, you can make an informed treatment choice. Our online clinical assessment takes just minutes, with UK-licensed prescribers reviewing your eligibility. For Alli 60mg, order directly. For prescription-strength Orlistat 120mg or Xenical 120mg, complete our medical questionnaire first.
All treatments are dispensed by our GPhC-registered Leicester pharmacy with next day delivery available. Use code EDM10 for 10% off every order - that's savings of up to £12.60 on our 12-week Orlistat supply. Start your evidence-based weight management journey today.
