Stuart is 40 years old, has a BMI of 32 and was recently commenced on Orlistat after lifestyle measures alone did little to reduce his weight. You speak to him over the phone and remind him that treatment with Orlistat should be discontinued after 12 weeks if he has not lost a minimum amount of weight.

What percentage weight loss of body weight (compared to before treatment) is routinely expected in order to continue treatment with Orlistat beyond 12 weeks of use?