Tuber vegetables include potatoes, yams, ocas, cassavas, jicamas and sweet potatoes. Tubers, which can be part of the stem or the root structure, are enlarged sections that store nutrients and moisture to keep the plant alive during the winter months. They also play an important role in the reproduction cycle.
After harvesting, tuber vegetables can be stored for several months in cool, dry locations with a consistent temperature of 40 degrees Fahrenheit. Because they are high in starch, these vegetables can increase blood sugar. They are also rich in vitamins and nutrients, such as vitamin C, beta carotene and potassium. Tuber vegetables, such as potatoes and yams, can be boiled, baked, grilled or fried. Jicama and sweet varieties of cassava can also be eaten raw.