“White” potato varieties such as yukon gold, russet, and red are yellow tier. Purple and sweet potato varieties are green tier. This is one that gets questioned in 90/10 a lot because potatoes are a natural root vegetable. The reasoning behind potatoes being on the yellow tier is that their nutrient value is low and they are a very “simple carb”. So, they cause blood sugar to rise quickly without much nutrient benefit much like white rice or white bread. Sweet potatoes and purple potatoes have higher levels of antioxidants and other nutrient benefits.
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