Tip #3 Avoid Processed Junk Food (Eat Real Food Instead) All the processed junk foods in the diet are the biggest reason the world is fatter and sicker than ever before. These foods have been engineered to be "hyper-rewarding," so they trick our brains into eating more than we need, even leading to addiction in some people. They are also low in fiber, protein and micronutrients (empty calories), but high in unhealthy ingredients like added sugar and refined grains.