Food Grade indicates a food's relative healthfulness compared to other similar foods. It is intended to help you make healthier selections within categories of foods (e.g., pick the healthier breakfast cereal).
Food Grade is calculated based only on nutrients found on the Nutrition Facts panel. It is not assigned to foods individually by a human nutrition expert. Thus, foods high in other important nutrients (e.g., omega-3 fats, zinc, polyphenols, etc.) may or may not have a high Food Grade. Also, if the particular food you are checking does not have the full Nutrition Facts panel, this may affect its grade.
Also, please note that while Food Grade does not include calories, it depends on the quantity of the food consumed. Larger amounts of not so healthy food will receive lower Food Grades and vice versa. When comparing two foods, make sure to use approximately the same quantities of these foods.
Please see Food Grade article for more details.
If you've chosen Keto or Low-Carb diet in MyNetDiary and PlateAI, then a special, Keto Food Grade or Low-Carb Food Grade will be used, which make more emphasis on carbs and fats.
Food grade settings can be found in the following way:
Me tab - App Settings - Diet Logging - Macros & Nutrients - Show Food Grade.