 And it's a controversial book because it points to the hazards of oxalates. Now, in conventional medicine, the way I was taught is that the main hazard of oxalates is that they can join with calcium in the gut to form an insoluble complex that then clogs up your kidneys and can cause crystals and ultimately kidney stones. And so people have kidney stones. It's well acknowledged. They should be on a low oxalate diet so they can go through oxalate.