The trouble is that we have “the wrong kind of cows”. It seems the black and white cows — Holsteins and Friesians — generally give milk that contains a small but significant amount of beta-casein type A1, which behaves like an opiate and which epidemiological studies have implicated in heart disease, Type 1 diabetes, autism and schizophrenia. This is big news, folks. Heart disease is the leading cause of death. This is like cigarettes and cancer.