When you first get your tamagothi or if it died you have to feed it 4 snacks and 4 meals. If your tamagothi is over weight his or her weight would be 30 or up. if your tamagothi does not want to play games and you do then just feed it 1 or 2 snacks or meals. That's how your tamagotchi it going to be fit and helthy. Have fun with your tamagotchi and do not forget to keep it in shape and helthy. 
