So I just started using fitday to keep track of my foods so that I can gain weight. I entered my current weight, 91 lbs and saw that my bmi is 17.25. Fitday says I'm underweight (which I know of course) and that my BMI should be 18.5, however why oh why won't the website allow me to set a goal higher than 91 lbs?! I keep trying and getting error messages. I put 80 just for the heck of it. Unfortunately, that entry was accepted.