Everything we take in makes us who we are today. What you have read made you think the way you think today. What you ate gave you the body you have today. We absorb everything as the building blocks to our life, and we are the product of it.
I usually talk about social barriers, which is more mental food, but I like to talk about the physical food too. What we feed into our body transforms us as a person. Either junk food or quality food, we change.
With every food selection, we have a choice: "Better food or better tasting food?". But fast foods or candies tastes SOOO good. I know. That's the struggle. In the long run is where the results show. Are you willing to to give up taste for quality nourishment of your body?
The choice is always there. Long term lack of nutrition doesn't sound like much, but this is when your body start to develop illnesses like diabetes, high blood pressure, and etc. Your food selection prevents your body from breaking down.
Of course, we all still love good tasting food, so you can schedule a few days in a week where you can enjoy whatever food you want. Still, let's increase the quality of our meals.