At least, not it any functional, useful, measurable way.

http://gizmodo.com/why-the-calorie-is-broken-1755389049?utm_source=recirculation&utm_medium=recirculation&utm_campaign=wednesdayAM

Remember the big argument on here about eating 3,000 calories of lettuce a day and not exercising and how it would make you fat? Good times.