As far as healthy diet goes start small. Drink plenty of water, this will keep you full longer and stop you eating just because you're bored. Stick to the food pyramid and eat something from all food groups. Snacking isn't bad, but there's definitely better choices out there then just chips and candy. Just be smart about it
The food pyramid has bread pasta rice as one of the most important food sources though this is litteraly sugar. It was created post WW2 to feed the masses as cheaply as possible. It's actually scary that these diet myths are still being promoted, even by doctors. Who get zero nutritional education in medical school. The starting slow bit is true though