Zefah said:Not underweight whatsoever. Underweight would be something closer to 120lbs or less.
In the low 160s at pretty much the same height, I still have substantial flab. I don't imagine it will completely go away when I reach 154 in the next couple of months.
This is because you need to gain muscle. You will always have flab if you don't have muscle. By the time your muscles do begin to show, you will be under-weight and not healthy.