Good for you! Sweet potatos are actually really good for you. It isn't most an issue of carbs, it is mostly an issue of JUNK carbs -- specifically carbs without a lot of fiber to dramatically slow down absorption.
Another great food to eat, which also has carbs, is "pulses": dried beans of various types. Super high in nutrion and even commplete proteins. Super cheap to buy and they will store for years if you keep them dry (so one of my favorite survival foods since I actually like eating them when cooked).
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