HOw often do you ride now and how far?
Do you do any other physical activity regularily?
If you are eating normal meals, then you could do up to 30 kms. daily with double or triple on weekend days. I used to ride this distance daily, between home and work when I lived in other cities and depending on where I was working.
I'm about 98-100bs. at 5'1". Long time TE forumites know me and know that I'm not starving myself at all.
I've been cycling for about last 19 yrs. Certain years,I have done up to 7,000kms. annually. But not this year. More like one-third of that. Oh well, I still feel good.
On long rides 100 kms or if I'm cycling full double pannier weight on a cycling trip, then I will eat bigger meals at the beginning of day as well as something during the ride.
I've never really analyzed if I'm underweight. No doctor has told me to put on weight, they just tell me I'm in great health, etc. Except at my age (going on 53 in a few months), I just can't consume too much sugar, high glucose food...ie. white rice, etc. That has nothing to do with my weight.
In my personal opinion, I'm average for a small-boned Asian. This is why I don't even worry about being underweight.
Perhaps the best thing is to outline the food/dishes you would normally eat during 1 day. Cruise around some of our meals here: http://forums.teamestrogen.com/showt...=33746&page=85