N90’s selection of food groups comes from a combination of scientific information and over 23 years of experience working with humans regarding optimal nutritional guidance. Consideration is taken from Monash Universities FODMAP diet and the Glycemic Index Foundation creating a list of anti-inflammatory foods that may regulate blood glucose levels. This list automatically addresses many digestive issues, such as gluten or fructose intolerance, and other metabolic conditions, such as prediabetes. N90 goes one step further and fine-tunes this list based on the results and observations discovered by Perry with his 23 years or more experience in the health industry.