Orange-fleshed sweet potatoes are great sources of beta-carotene. Sweet potato cyanidins and peonidins and other color-related phytonutrients may be able to lower the potential health risk posed by heavy metals and oxygen radicals. Anthocyanin and other color-related pigments in sweet potato are equally valuable for their anti-inflammatory health benefits. The 6.6 grams of dietary fiber in a medium sweet potato are definitely a plus in terms of blood sugar regulation, since they help steady the pace of digestion. Sweet potatoes are one of four vegetables that have a GI ranking of medium. The other three vegetables are beets, corn, and leeks.