Lactose Intolerase or Lactase Deficiency and why might hydrogen be detected on the breath?
Lactase is the only enzyme which breaks down Lactose ----> Glucose + Galactose. This enzyme activity can decrease overtime so many adults lose the ability to digest lactose (found in diary products). Genetic component, people of thai origin are prone to LI. Furthermore, when lactose is broken down by bacteria in the large intestine, hydrogen is a byproduct. Since most of the lactose in a LI patient ends up in the colon, they tend to produce detectible amounts of hydrogen in the breath.