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The Science Behind How Orlistat Works
Orlistat's mechanism is straightforward yet effective. When you eat a meal containing fat, your body naturally produces lipase enzymes to break down that fat for absorption. Orlistat inhibits these lipase enzymes, preventing approximately one third of dietary fat from being digested and absorbed. This unabsorbed fat passes through your digestive system naturally, reducing the calories absorbed from your meal.
Why This Mechanism Makes Orlistat Effective
Unlike appetite suppressants that work in the brain, orlistat acts directly where fat digestion occurs - in your gut. This targeted approach means it specifically addresses dietary fat intake without affecting other nutrients like proteins or carbohydrates. The fact that it blocks approximately one third of fat absorption provides measurable calorie reduction while still allowing normal digestion of other nutrients.
Orlistat vs Xenical vs Alli - Same Mechanism, Different Strengths
All three products work through the same lipase inhibition mechanism. Orlistat 120mg (£32.99 for 4 weeks, £29.69 with EDM10) and branded Xenical 120mg (£42.99 for 4 weeks, £38.69 with EDM10) contain identical active ingredients at the same strength. Alli 60mg (£54.99 for 8 weeks, £49.49 with EDM10) uses half the dose, blocking a smaller proportion of fat but potentially causing milder side effects.
What Happens When You Take Orlistat
Within hours of taking orlistat with a fat-containing meal, the medication begins inhibiting lipase enzymes. The blocked fat cannot be absorbed and moves through your intestines unchanged. This process explains why keeping meals low in fat (approximately 15g per meal) minimises gastrointestinal effects while maximising the weight management benefits. The mechanism works consistently with each dose, providing reliable fat-blocking action.
Clinical Evidence Supporting the Mechanism
Orlistat's fat-blocking mechanism has been extensively studied and proven effective in clinical trials. The approximately one-third fat absorption reduction translates to meaningful calorie reduction when combined with a reduced-calorie, lower-fat diet. This mechanism-based approach to weight management has made orlistat a trusted prescription treatment for adults with BMI 28+ with risk factors or BMI 30+.
Start Your Treatment Today
Now you understand exactly how orlistat works, you can make an informed decision about treatment. Complete an online clinical assessment today to see if orlistat is suitable for you. Our UK-licensed prescribers will review your information, and if appropriate, your medication will be dispensed by our GPhC-registered pharmacy with next-day delivery. Use code EDM10 for 10% off your order.
