Your cells use glucose, a kind of sugar, for energy. The hormone insulin helps get the glucose from digested food into your cells. People with fatty liver disease often have a condition called insulin resistance. That means your body makes insulin but can’t use it well. builds up in your blood, and your liver turns it into fat. Certain fats in your diet can help your body use insulin better. That means your cells can take in glucose and your liver doesn't need to make and store fat.