Speaker: David Winston. Digestion and absorption are the foundation of health. What you eat is vitally important but the best food in the world will do you little good if you do not have the ability to digest and absorb it. Common gastrointestinal problems are discussed including achlorhydria, esophageal reflux, acid reflux, gastroesophageal reflux disease (GERD), IBS, biliary dyskinesia, and herbal protocols for their treatment.