Arnold Schwarzenegger is no longer crushing workout shakes . At 78, his muscle routine is fueled by oatmeal, soup, and moderation. "I used to drink, for instance, protein drinks, but I don't do that that much," Schwarzenegger told Business Insider. "I just think that I eat really well and I stay healthy this way." While eating enough protein is crucial for healthy aging, too much LDL cholesterol from high-fat animal products can lead to heart disease and stroke. Doctors generally recommend