How do different food groups affect health?

Administer food diaries and assess the impact of food groups/categories, such as fruits, root vegetables, green leafy vegetables, all other vegetables, low-fat dairy, full fat dairy, fish, white meat, red meat, processed meat, nuts & seeds, beans/legumes, whole grains made from flour (pasta, bread, pastries), intact whole grains (i.e., whole grain products not made from flour), refined grains, refined sugar, oils, etc. Also, get info on the cooking/processing method (e.g., frying, steaming).