It's 'overrated,' Tamar Haspel writes
                                
                                
                                    (Newser) -
                                    Next time you think about ordering a salad at a restaurant, consider this: It's probably not the healthiest choice for either you or the planet, writes Tamar Haspel in the  Washington Post . According to one nutritional value index, lettuce, cucumbers, radishes, and celery are some of the lowest-ranking foods...