I am 12 years old. I feel over weight and I try to tell my mom but she doesn't understand. I used to weigh 120 lb. and then I woke up one morning and I weighed myself. I had gained 40 lb. overnight. I have no idea how this happened because I was eating healthy and I was excercizing. This wasn't near any holiday where people tend to splurge like Christmas or Thanksgiving. I had recently started my period for the first time and I think it is because of that. I don't look any different from then and I am wondering how and why this happened and how I can get rid of the excess weight. Please help!