What we eat determines what kind of bacteria we foster the growth of in our gut, which can increase or decrease our risk of some of our leading killer diseases. Subscribe to Dr. Greger’s free nutrition newsletter at http://www.nutritionfacts.org/subscribe and get a free excerpt from his latest NYT Bestseller HOW NOT TO DIE. (All proceeds Dr. Greger receives from the sales of his books, DVDs, and speaking engagements go to support the 501c3 nonprofit that runs NutritionFacts.org.)