Fats don't impact blood
sugar. Healthy fats should be eaten to make up energy requirements
. These will include unprocessed oils (olive, coconut, nut oils, avocado) and animal fats; butter, cream, lard, fish oils. Avoid transfats, manmade fats such as margarine and heavily processed oils such as vegetable oils.
Most of your food should be unprocessed or minimally processed. Avoid foods with many ingredients, particularly with additives and chemicals.
Hope this helps.