After I lost ~50 lbs and got down to a BMI of 20-21 but before I started really lifting, my friend who's one of those wannabe fit, but fat, chicks, and has a big gut because even tho she works out, she can't seem to figure out the diet part - anyway, she told me I was getting "too lean" and need to bulk a bit. Hahaha. Jokes on her because 2 years later I'm more muscular than she'll ever hope to be lol, and guess what, I did it without getting fat.