> Being sub 12% body fat (…) is arguably unhealthy in and of its own How so? A couple years ago I was at 10% and running a ½ marathon three times a week. I fel

> Being sub 12% body fat (…) is arguably unhealthy in and of its own How so? A couple years ago I was at 10% and running a ½ marathon three times a week. I felt pretty healthy.