I recommend watching this lecture by Dr. Terry Wahls. She has suffered the ill effects of malnutrition, and it's effecting on our cellular powerplants - The Mitochondria.
If the cell starves and the mitochondria is unable to keep up with energy production due to your walking or running or daily routine, you will crash and deteriorate over time. Processed foods do not give us the nutrition our cells need for quality life. Their quality life is important, as it is the basis of the overall multi-cellular human organisms quality of life.
Invest your money and quality of life in Organic, Evolutionary, Seasonal and Fresh food. Support farmers who would grow vegetables for you, if you can't grow it yourself. Use your front lawns to grow food. A sustainable home is one that produces it's own produce.
Strengthen your Subatomic Defense System by eating vegetables, leafs and roots.
Take responsibility foryour biological/physical body by learning what it really runs on. It certainly runs on Vitamins, Minerals, Fatty acids and Amino Acids.