I think OP means foods that aren't classified as "sweets" (candies, cookies, cake, etc) also have sugar. High carbohydrate foods like pasta, bread, tomato sauce

I think OP means foods that aren't classified as "sweets" (candies, cookies, cake, etc) also have sugar. High carbohydrate foods like pasta, bread, tomato sauce, all metabolize quickly to sugar, which acts on insulin levels in the same way "sweets" do.