Milk is a good source of calcium but a poor source of iron. meat is a good source of iron but a poor source of calcium. individuals who eat from both of these food groups are incorporating what characteristic of a healthy diet into their meal plan? milk is a good source of calcium but a poor source of iron. meat is a good source of iron but a poor source of calcium. individuals who eat from both of these food groups are incorporating what characteristic of a healthy diet into their meal plan? freshness variety moderation balance