If you look at the classics, the most frequently cited articles in the scientific nutrition literature, the original glycemic index paper comes out at #10, cited over a thousand times. Learning about fruit, vegetables, and cancer prevention was a hallmark. But hitting the top five, cited more than 2,000 times, “Dietary modulation of the human colonic microbiota: introducing the concept of prebiotics.” Prebiotics are the food components that feed and nourish the good bacteria in our gut, like fiber and resistant starch. In general, eating high-fiber plant foods is a good foundation for a prebiotic-rich diet. Once upon a time, fiber was just thought of as just the undigested component of foods, known only for bulking up our stools and keeping our bowels regular. Then, we discovered an array of receptors in the body in which fiber breakdown products fit in like a lock-and-key. We feed our good bacteria with …