Self-tutoring about diet: the tutor inquires about sweet potatoes.
Bodybuilders might favour sweet potatoes over regular ones, perhaps because of the carbohydrate-to-fibre ratio, which is lower for sweet potatoes.
Sweet potatoes have a carbohydrate:fibre ratio of around 5.75:1, whereas for regular potatoes it can be around 13:1 (although, per variety, it likely varies).
Lower carbohydrate:fibre ratio generally translates to lower glycemic index and feeling full longer.
Source:Oracle Tutoring by Jack and Diane, Campbell River, BC.