I believe the food group that it should not be in would be the meat,fruit,vegetables
Your answer to this is most likely:
He discovered many other important elements.
Aerobic Exercises is the answer
Emotional Health = the ability to express your emotions appropriately for your age
Mental Health = the ability to manage your actions stemmed from your emotions (the ability to engage the appropriate reaction to situations)
So emotional health is more about your actual emotions and mental health is more about what you do with those emotions. However, they are both similar in the fact that they both deal with emotions.