Knowledge: To prevent getting a cold, it is best to dress warmly and avoid human contacts. On the other hand, working out every day and eating healthy will lower the risk of obesity.

Conversation:
It is a shame how many people are obese nowadays.
Is that so? I'm aware of obesity as a medical condition that can negatively impact a person's heatlh.
Do you know the percentage of people that are obese in America right now?
I'm not sure. What I can tell you is that BMI, which is used to determine if someone is obese, is calculated by dividing the weight of a person by the square of their height.
Do you know the main causes of obesity?
Obesity is most commonly caused by a combination of excessive food intake, lack of physical activity, and genetic inheritance.
Ah I see, do you know how to prevent obesity?

Response: Sure, to prevent obesity, it is best to work out every day and eat healthy.