Very few studies on popular diets (think, “Weight Watchers” or “The Zone”) have been focused on, or even provided segregated results for, the elderly. And there’s an argument to be made here, because — really — if you’ve made it past 80, who’s going to tell you to change the way you eat? And even if they did, would you listen? But the fact is, our gastrointestinal tract changes as we age, and there are simple things you can do to make life better. Time magazine gives us the 5 step “nutrition takes guts” check-up.