Hi, and technically "didn't gain weight" is not exactly accurate! It's still encouraging though, so don't worry!
I've been on lithium for 20 yrs - and I've gone from 105 lb when I was first on it, to a high of 145 lbs and now I've been 125 lbs for 4-5 yrs and I'm 50 yrs old.
BUT - when I got up to 145 lbs I had a desk job and drank (are you ready?) about 10 cans of Mountain Dew a day.
If you multiply the calories on that it is a miracle that I was not a COW on lithium!!!
One of the usual side effects of lithium is that it makes you thirsty.
ALOT of people gain the weight because they are choosing pop/juices etc that have alot of calories.
I drink ALOT of water now - sometimes with a little lemon juice for some variety.
And I try to keep all pop (even diet, because of the caffeine) out of the house. That way I can treat myself to it when I have dinner out but don't go overboard because I'm thirsty.
The other BIG point I want to make is to be realistic! You're not gonna be 5'4" and 97 lbs no matter WHAT you do and it doesn't look good no matter what they try to tell us thru advertising and marketing.
Allow yourself the luxury of being on the high end of the weight range for your height. And over a few pounds too! (If there are eating disorder issues that's a whole nother problem to deal with here I know)
Here's my word:
Do you want to be balanced and a little overweight, or out-of-control bipolar and skinny?
A tougher question for some than for others I know...