The Science Behind Fat Blocking - Why It Works
How Orlistat Blocks Fat Absorption
Orlistat works through a proven mechanism that targets lipase enzymes in your digestive system. These enzymes normally break down dietary fat so your body can absorb it. When you take orlistat, it inhibits approximately one third of these lipases, meaning roughly one third of the fat you eat cannot be digested or absorbed. This unabsorbed fat passes naturally through your body, reducing the calories that contribute to weight gain.
The mechanism is the same whether you choose generic orlistat 120mg (4-week supply £29.69 with EDM10), branded Xenical 120mg, or lower-strength Alli 60mg. All work by blocking fat absorption locally in the gut, not through your bloodstream or brain.
Why This Mechanism Makes Orlistat Effective
Unlike appetite suppressants that work on brain chemistry, orlistat's fat-blocking mechanism provides direct, measurable results. Every gram of fat blocked saves 9 calories from being absorbed. Over time, this calorie reduction supports weight loss when combined with a reduced-calorie, lower-fat diet and increased physical activity.
The mechanism also explains why keeping meals lower in fat (approximately 15g per meal) minimises gastrointestinal side effects. When there's less fat to block, you experience fewer of the oily stools or urgent bowel movements that can occur with high-fat meals.
Orlistat 120mg vs Alli 60mg: Same Mechanism, Different Strength
Both prescription-strength orlistat 120mg and Alli 60mg work through identical fat-blocking mechanisms. The prescription strength (available as generic orlistat from £15.20 for 2 weeks with EDM10, or branded Xenical) blocks more dietary fat due to the higher dose. Alli 60mg provides the same mechanism at half strength, blocking a smaller proportion of fat absorption.
Clinical assessments help determine which strength suits your weight management goals. Our UK-licensed prescribers review your individual circumstances to recommend the most appropriate option during your online consultation.
What Happens to the 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 you may notice oily stools or increased bowel frequency, particularly if meals contain higher amounts of fat. These effects are actually evidence the mechanism is working effectively.
Taking a multivitamin at bedtime (at least 2 hours after your last orlistat dose) helps replace any fat-soluble vitamins (A, D, E, K) that may be reduced due to the fat-blocking mechanism.
Order Today: Proven Fat-Blocking Mechanism
Now you understand how orlistat's fat-blocking mechanism supports weight loss, you can choose the option that suits your needs. Generic orlistat 120mg offers the most cost-effective prescription strength (12-week supply £86.39 with EDM10), while Xenical provides the same mechanism in branded form. Alli 60mg gives you the same fat-blocking science at half strength.
Complete your online assessment today - our GPhC-registered pharmacy provides next-day delivery across the UK. Use code EDM10 for 10% off every order, giving you proven fat-blocking science at the best available price.
