Sick of work? Maybe it's your office that needs a check-up. Diane McFerrin Peters, a management consultant and co-author of Care to Compete? (a book about how companies can manage employees while keeping both people and profits in mind) says that many companies aren't operating at maximum brainpower because they don't focus enough on the health of employees. "There are a number of ways your boss could make your office a healthier place," says McFerrin Peters, who lectures to such companies as AT&T, McDonald's, Merrill Lynch, and FedEx. "The key is to convince your boss that…