Learn to want foods that nourish your body and provide clean sources of energy.
Think about why you really eat all of those high calorie, non-nutritious foods.... Is it because you want to have unstable energy levels? Do you want to continue gaining unhealthy amounts of body fat? Do you want to encourage the growth of disease within your body?
In reality, more of the poor food choices people make are because of habits rather than conscious thought about what they really want.
Learn to want nutrient dense, healthier foods and then Eat What You Want.
