The Science Behind Fat Blocking: Why It Works
How Orlistat Blocks Fat Absorption
Orlistat works by inhibiting lipase enzymes in your digestive system. These enzymes normally break down dietary fat so it can be absorbed into your body. When orlistat blocks these enzymes, approximately one third of the fat you eat cannot be digested or absorbed. This unabsorbed fat passes naturally through your system, reducing the calories available for storage as body fat.
Why the Mechanism Makes Orlistat Effective
Unlike stimulants that affect your brain, orlistat works locally in your gut where fat digestion occurs. This targeted action means it directly reduces calorie absorption from fatty foods without systemic effects. The mechanism is consistent whether you choose generic orlistat 120mg (84 capsules for £29.69 with EDM10), branded Xenical 120mg, or lower-strength Alli 60mg.
Understanding the One-Third Fat Blocking Effect
Orlistat blocks approximately one third of dietary fat - not all fat consumed. This means if you eat 30g of fat in a meal, roughly 10g passes through unabsorbed while 20g is still digested normally. This partial blocking helps reduce overall calorie intake while allowing essential fat-soluble vitamin absorption when combined with a balanced, lower-fat diet.
How Long Does the Fat Blocking Effect Last?
Orlistat's fat-blocking action occurs with each dose. Taking one 120mg capsule with each main meal containing fat provides consistent lipase inhibition throughout the day. The medication works for approximately 1-2 hours after taking, which is why timing with meals is important. Our 168-capsule packs (£57.59 with EDM10) provide 8 weeks of this proven fat-blocking mechanism.
Why This Mechanism Requires Prescription Oversight
The fat-blocking mechanism can cause gastrointestinal effects when dietary fat intake is high, which is why clinical assessment ensures suitability. Our UK-licensed prescribers evaluate your health profile through online consultation before prescribing. The mechanism works best alongside a reduced-calorie, lower-fat diet - guidance provided with every prescription from our Leicester-based GPhC-registered pharmacy.
