Old Fashioned slow cooking Quaker Oats is healthier for you than the Instant oatmeal. The Instant oatmeal has already gone through some process and it turns into sugar quicker in your bloodstream than the slow cooking oatmeal. When there is a rapid rise in blood sugar, it causes inflammation, and that inflammation can cause problems with your skin and digestive track if you have an over abundance of yeast in your system.