Sweet Potato vs. Yam
The Difference Between Yams and Sweet Potatoes
Sweet potatoes and yams are close to one another in taste and appearance - close but no cigar. Most people easily get befuddled if asked to pick between a yam a sweet potato and vice versa, but they are not actually the same.
In the 17 and 1800's, the orange sweet potatoes were called 'nyam' a derivative of the African word for them "nyami". Nyami in the southern dialect over time shortened to yam which by coincidence was the same name for true yams and the confusion continues to this day.
A sweet potato has less fats, carbs and calories than a yam. They have more calcium and sugar as well. When cooked they are sweeter and moister. Although there are big difference between these two similar tubers some varieties are close enough to one another that they can at times be substituted for one another in some recipes - as for me I prefer sweet potato pie and not Yam pie.
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