Dr. Glenn Geelhoed is a marathoner, photographer, and big game hunter, who has been on over 200 international medical missions to developing countries, and helped broker peace between warring Sudanese tribes. He talks with Second Opinion Live hosts Dr. Michael Greenberg and Dr. Matthew Birnholz about what he has learned from his patients in the poorest parts of the world about doing more with fewer resources. Plus: medical oddities, and conflicting research on sodium.