I care a lot about my diet and what goes into my body. I even count my calories!
It's good to watch what you eat. A diet is the sum of food consumed.
I always thought a diet meant you were trying to lose weight.
Not necessarily. Some diets are designed to cause weight gain.
Thats interesting! Why would someone be interesting in gaining more weight?
It depends on the choices and quality of someone's life. They may be seeking to gain more muscle mass.