Yup. I second all of the posts saying you'd be underweight if you go under 123 lbs (doesn't matter how old you are.) If you are trying to lose 10lbs to make yourself smaller, honestly I wouldn't. My suggestion? Ditch the scale and focus on weight/strength training to shape your body, ignore the scale. Buy a measuring tape if you don't have one already. Most importantly? DO NOT UNDEREAT. You can still lose on a decent amount of calories especially if you are working out for an hour a day (how you are doing it on 800-900 calories a day without fainting or feeling lightheaded is mind-boggling.) Admittedly when you start eating the right amount of calories, the scale will be up a little bit but it WILL EVEN OUT (it is just water weight) within a week or two, so don't panic and keep going.
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