The Science Behind Orlistat's Fat-Blocking Action
How Orlistat Blocks Fat Absorption
Orlistat works by inhibiting lipase enzymes in your digestive system that normally break down dietary fat. When these enzymes are blocked, approximately one third of the fat you eat cannot be digested or absorbed into your body. This unabsorbed fat passes naturally through your digestive system, reducing the calories absorbed from fatty foods.
Why This Mechanism Makes Orlistat Effective
Unlike appetite suppressants that work in the brain, orlistat acts locally in your gut. This targeted action means it directly reduces calorie absorption from fat—the most calorie-dense macronutrient at 9 calories per gram. By blocking roughly one third of dietary fat, orlistat can significantly reduce your daily calorie intake when used alongside a structured eating plan.
Xenical vs Generic Orlistat: Same Mechanism, Different Prices
Both Xenical 120mg and generic orlistat 120mg contain identical active ingredients and work through the same fat-blocking mechanism. The difference is price: Xenical costs £42.99 for a 4-week supply (£38.69 with EDM10), while generic orlistat costs just £32.99 (£29.69 with EDM10). You get the same proven fat-blocking action for less.
What Happens When You Take Orlistat With Meals
Take one 120mg capsule with each main meal containing fat—up to three capsules daily. The medication works within your digestive system during that specific meal, blocking approximately one third of fat absorption. If you skip a meal or eat a fat-free meal, you can skip that dose. This flexible dosing matches your eating pattern.
Evidence That the Mechanism Works
The fat-blocking mechanism produces visible evidence—unabsorbed fat appears in bowel movements as oily spotting or changes in stool consistency. While these side effects may seem inconvenient, they're actually proof that orlistat is working exactly as designed. Keeping dietary fat low (around 15g per meal) minimises these effects while maintaining the weight management benefits.
Order Your Fat-Blocking Treatment Today
Now you understand how orlistat's mechanism blocks approximately one third of dietary fat absorption, you can make an informed treatment choice. Complete our online clinical assessment to get your prescription from a UK-licensed healthcare professional. Generic orlistat starts from £16.89 for 2 weeks, Xenical from £21.50—both with 10% off using code EDM10.
