Having a garden is good for you, and not just because you grow food. Before you even get any of the food out of the garden, you get exercise. Then there is a five element perspective.
Earth, fire, water, air and space are the five elements of Godai philosophy. If you put your hands in the earth to help grow the food, you get the extra benefit of better digestion as the earth element is related to digestion, water is related to the kidney and air is related to the lung. Just the act of gardening is good before you even put the beautiful food on the table.