They can be even considered as a super food.
The aim of one Washington University study was to discover which vegetables contain the most nutrient per dollar.
The Anti-Cancer Potential of Sweet Potato Proteins video presented below, shows a graph of nutrition versus availability for various foods.
Dark green leafy vegetables as one of the healthiest foods are also one of the cheapest, while the scores for the most nutrient-rich food per dollar turned out to be sweet potatoes.
Not only that sweet potatoes are rich in nutrients, but they also possess anti-cancer properties. Back in 1931, sweet potatoes were discovered to possess a unique protein.
As a matter of fact, 80 percent of sweet potato protein is a protease inhibitor type which has potential anti-cancer properties.
Initially, these potato’s proteins were tested against blood cancer, leukemia, and it showed to subdue growth of leukemia cells in a petri dish.