Carbohydrates are found in almost all living things and play a critical role in the proper functioning of the immune system, fertilization, blood clotting, and human development. A deficiency of carbohydrates can lead to impaired functioning of all these systems, however, in the Western world, deficiency is rare. Excessive consumption of carbohydrates, especially refined carbohydrates like sugar or corn syrup, can lead to obesity, type II diabetes, and cancer.
Unhealthy high carbohydrate foods include sugary cereals, crackers, cakes, flours, jams, preserves, bread products, refined potato products, and sugary drinks.
Healthy high carbohydrate foods include vegetables, legumes (beans), whole grains, fruits, nuts, and yogurt.