Your relationship with food is a powerful sign of your relationship with your Self. Food is about nourishing your body, fuelling it to perform optimally. When you truly have a healthy, loving relationship with your Self, junk food is no longer an option; someone who respects themselves does not need willpower to resist junk- they nourish themselves because it is a gift to their body.
The first step to making better food choices is filling yourself with information, knowledge is power. Then comes the task of cultivating enough self-love to value your Self enough to truly engage in the lifestyle change long term. It's not about deprivation, willpower, or temptation. It's about loving your Self enough to take care of your body like it is something you are borrowing, giving it the same love and attention you would your own child.