Why do cannibals get the shakes?

Unlike the movies there is no set sign of cannibalism. There are various neurological disorders and infections that can be acquired through the consumption of human or primate flesh. A more common known disease is Kuru. A terrifying neurological disease Which is similar to Mad Cow disease. Some of the first signs of dementia or malnourishment is loss of nerve control or shaking. But otherwise a cannibal has no tale tell sign of dietary activities.