Want to get healthy and lose weight? Cut the processed foods. If it comes in a box, don't buy it. If there are ingredients you have trouble pronouncing, don't buy it. Your body has evolved to know when you've had enough food (slowing down your eating will help too). But those foods that are designed in a lab have sugar and other "bad" stuff in disproportionately high amounts, so by the time you've eaten enough to feel full, you've eaten way too much.
TL;DR: stop eating so much, fatty