SMALL CHANGES No need to reinvent the wheel. Little tweaks to your food and exercise routine can pay off. ONE MONTH TO A HEALTHIER DIET If we are what we eat, most Americans are in trouble. Big time. And it can feel like an insurmountable feat to go from drive-thru cheeseburgers and processed snacks to salads and nutrient-dense foods. But it might be easier than you think. "You don't start off by running a marathon," says Jessica Crandall, a registered dietitian nutritionist and spokeswoman for the Academy of Nutrition and Dietetics. "You start by running that first mile." Or maybe even walking that first mile. 16 W IN TER 2016 PHOTO BY HERO IMAGES/GLOW IMAGES You can feel better in just 30 days, without a major life overhaul