this caught my eye.
are you getting to be underweight per the body fat charts?

I think i agree with your PC that it might lead to inner or other troubles IF you are ignoring or covering any feelings.
But if you are truly feeling better about things and doing activities because you are feeling better then he would be wrong.

So I guess the answer is to look inside yourself and see what fits.

BMI chart-
http://owndiet.com/weight_height_charts.htm