My body proportions never bothered me of course, but I could not avoid to remark that everyone I know in my age has increased its weight, from
little to
too much, during the last decade.
My life is sedentary (office work), I have a rather varied diet, zero coffee/alcohol, but anyway I always was like that.
I found recently a BMI calculator
http://www.halls.md/body-mass-index/av.htm
and there I saw that I am considered underweight (and seriously so, < 2nd percentile).