During the past 10 years, I have been delighted to receive thousands of letters of gratitude from Readers, who have taken the time to share with me how eating the World’s Healthiest Foods has changed their lives. They have written to tell me that they have experienced greater energy, better sleep, more lustrous hair, clearer skin, enhanced concentration and memory, and many other signs of overall vitality. Others have also shared that eating the World’s Healthiest Foods has helped their cholesterol to drop, their blood pressure to normalize, their blood sugar levels to stabilize, and their headaches to dissipate. Over the years, Readers have shared with me how much they have learned from the WHFoods website and The World’s Healthiest Foods book. Yet, this learning is definitely a two-way street: as Readers have learned from us, we have also learned so much from them. One of the discoveries that I find most exciting has been the recognition of yet another incredibly positive benefit of the World’s Healthiest Foods: