Longman Dictionary of Contemporary English
food group
noun
EXAMPLES FROM OTHER ENTRIES
▪ A balanced diet includes foods from all the food groups.
Wikipedia
Food group
A food group is a collection of foods that share similar nutritional properties or biological classifications. Nutrition guides typically divide foods into food groups and recommend daily servings of each group for a healthy diet. In the United States for instance, USDA has described food as being in from 4 to 11 different groups.