One serving (one ceasca- 200g ) sweet potato contains 65% of the ration minimum daily requirement of vitamin C. Sweet potatoes are also rich in calcium , folate , potassium and beta – carotene. Beta -carotene is an antioxidant that turns into vitamin A in the body: one serving of sweet potatoes can provide about 700 % of the recommended daily allowance for vitamin A. Science in the Public Interest Center believes sweet potato as the number one most vegetables nutritious because they are so nutrient rich .