Janet is 22 years old and comes to see you as she is concerned about her weight. She has been trying to lose weight now for over 2 years and tried dieting and exercising all with little success. She has read up about Orlistat and is keen to try this. She has no other past medical history and is otherwise well. You calculate her BMI.
What is the minimum BMI she must be for you to consider initiating Orlistat?