Well wubzywoo it's good your concerned, and being lactose entolerent means no milk products I think, right? Anyway, milk products do have some fat in them that is well, fat, so maybe lacking in that certain food group can cause you to be not as heavy, but I'm sure if your family is ok with it, your fine. I know your not anerexic, but at least your taking charge and say being anerexic is a pretty bad thing. Just incase, see a doctor because I think that is a little under weight, but I'm sure it's nothing everyone is diffent.