From a biological point of view, I'm quite sure there are people who have something "wrong" with their physiology and who become sick from that. However, I believe that quite often, a proper diet such as one without sugars, milk products and corn starches along with daily excercise may help a lot. Either way, there will be people who just don't function normally.
Not defending medication as the solution, but one reason for medicating is that it's sometimes quite hard to work with people and for example counsel them in their emotional life when they are sick. Medication may lift someone out of their sickness long enough for them to reflect on themselves and recognise what they need to change in their lives. So, yes - sometimes it is merely treating the symptoms, but that can be an important step to recovery as well.
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