The body is a bio-organism and survives as best as possible on what we put in it. When the chemical composition of the food we eat creates balance in the system, the body thrives, healthily over long periods of time. If the food compounds we put in our body throws it out of balance, the biological systems will try to restore balance, but they can't do it forever.
By eating well, especially when vegetables, fruits, whole grains, and legumes comprise the food elements we ingest, the chances of maintaining biological balance and harmony go way up. This is especially true if fat makes up less the 15% of the daily calories and protein, as well, makes up around 15% of calories.
Eating well is a sign of respect for your self and the organs, bacteria, and cells within your body which will aid us throughout life. They need the proper chemistry to succeed and that can be achieved easily by what we put on our plates, every meal!