Originally Posted by
k_tech
Btw, I'm 24 yrs old, female, 110 lbs on average and about 4% body fat.
If you didn't forget a digit, and you had a reliable test, that BF is way too low. Women should worry when they go under 12%. All bodies need fat to operate correctly; women need a bit more than men. 4% might be OK for a man briefly during the height of the season. 8% is a better male minimum. So eat! Forget that conventional "you can't be too thin" BS.