How do I know if I need to gain more weight?

At your doctors office, there should be a chart of healthy weight. It will direct you to what doctors perceive a healthy weight to be. It is set by your gender, age, and height.


With the internet today, one can find anything.
chart of height and weight - Bing Images (http://www.bing.com/images/search?q=chart+of+height+and+weight&qpvt=chart+of+height+and+weight&FORM=IGRE)