Because the doctor is concerned about something the person has.
This is true. If it has nothing or little to do with genetics than it is a skill based action, practice and repetition can help improve these.
Answer:
they compare the relative amounts of each kind of food to be eaten daily. eating more calories balances more activity.
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Exercise is used primarily to keep in shape, and be active. It can be used to lose weight, and prevent certain health conditions. It can also be used to improve your mood and energy level.
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