Hi, I just want to ask why am I getting fat soooo fast, taking in consideration that I am a sprtive woman and I am not a big eater?

What kind of things do you eat and what kind of exercises do you do? Is there more information that could help us out here? How much weight are you gaing in a time? I know my girlfriend has gained 4 pounds in the past 5 months and she thinks she is getting so fat. Which is not true, so what is the case?