On nutrition: Old and new diet trends

This is how old I am: A few decades ago, I sat in on a nutrition debate between Dr. Dean Ornish and Dr. Robert Atkins, well-known cardiologists with polar opposite views on the best diet to lose weight and prevent heart disease. Each of the heart doctors was passionate about his diet plan, though the diets were/are in hard contrast to each other.
This is how old I am: A few decades ago, I sat in on a nutrition debate between Dr. Dean Ornish and Dr. Robert Atkins, well-known cardiologists with polar opposite views on the best diet to lose weight and prevent heart disease. Each of the heart doctors was passionate about his diet plan, though the diets were/are in hard contrast to each other.