The lunch break is a very valuable part of the workday. Unfortunately, most of us don't take it seriously. Research shows an astonishing 65 percent of working Americans tend to eat lunch at their desks, in front of screens. Or worse, many sometimes skip the meal altogether. It's time to stop wasting that precious time and make it work for you instead. We turned to six health and fitness experts to ask what they eat and how they spend their midday meals.