Here’s one simple exercise for quickly improving your investment returns. — It’s New Year: Many of you are on new diets, or at least were for a couple of days three weeks ago. Because yes; most don’t last, and therefore don’t work. But one type of diet does work: The Elimination Diet. It helps you to figure out what foods are hurting you. And once you know, say, shellfish knocks you flat for 24 hours, it becomes harder to eat it again knowing the pain that will follow.