Luis Figueroa interviews Buford L. Nichols regarding his lifelong relationship with Guatemala. Nichols speaks about the origin of his collaboration, especially to the advancement of medical pediatric protocols and investigations focused on digestive issues. He talks about some of the most challenging cases he had to deal with, and gives some inspiring words of advice to students that are actually going through medical school. Finally, he speaks about some of the most important discoveries related to the effects of breast milk in the digestive process of infants.