People, not to mention device makers, are quickly turning to technology to make health and fitness more accessible, more understandable, and more portable. But it's one thing to know how many steps your took or how fast your hear is beating. It's a whole different case when trying to measure how much fat your body is burning. LEVL thinks it finally has a solution to that ever elusive problem. And all it will take is a single breath. It's like taking an breathalyzer test but, instead of measuring alcohol levels, you'll be on the lookout for acetone.