Despite being labeled a nut, they are actually a type of legume. On the other hand, jungle varieties have had limited cultivation. Like heirloom tomatoes, they remain truer to how the original wild plant actually was, before industrial farming. The wild jungle peanut is an heirloom variety native to South America. Peanuts contain beta-sisterol, a nutrient with proven anti-cancer benefits. This may explain studies that have linked peanut consumption with decreased risk of colon cancer. Beta-sitosterol also helps reduce overall levels of cholesterol in the blood.