response: I'm not aware of the diseases. However, have you heard how on average, obese people will spend more energy than the normal sized person due to the extra body mass?
original_response: yeah and  On average, obese people have a greater energy expenditure than a healthy person
history: I have a friend who is suffering from obesity, do you know what that is? I do. Obesity is a medical condition in which excess body fat has accumulated. Ohh okay I see, is there anyway to reduce that excess body fat? Not sure on that but when over a certain BMI value, a person is generally considered obese then. BMI is calculated from a person's weight divided by the square of their height. Okay I see, that is interesting to note, I am not sure what her BMI is, but she told me she has been diagnosed with obesity.  Can you tell me more about it? Sure, the chances of a number of diseases and conditions are increased due to obesity. I have heard about that before, what types of diseases and conditions does it increase?
knowledge: On average, obese people have a greater energy expenditure than their normal counterparts due to the energy required to maintain an increased body mass.