Boys:
-Deepening in Voice
-Growth Spurts
-Pubic Hair Development
-Increased Production of Testosterone and Sperm Cells
Girls:
-Growth Spurts
-Pubic Hair Development
-Menstrual Cycle Begins
-Increased Production of Estrogen and Eggs
Stimulant drug I think would be the best answer
You can decrease your fat by doing exercise
Beginning signs would be memory loss, inability to do challenges, difficulty completing tasks, confusion with time, misplacing things, poor judgment, etc