A report came out that the former champ was injected with a drug that causes Parkinson disease in the late 70’s as a planned by the US government to bring him down from the most influential, charismatic, and dangerous critic of his voice and physical strength.

Methyl phenyl tetrahydropyrinide (MPTP), an amphetamine, causes a rapid Parkinsonism according to the drug’s toxicity report. A chemistry graduate from Maryland known as Barry Kidston, in 1976, He injected his self with MPTP and within three days symptoms of Parkinson disease began to show.

In 1981, Ali was examined by Mayo clinic and told the world that he has mild dementia pugilista- a common condition among boxers. The world accepted the idea that he got his Parkinson disease on his boxing carrier.

Former boxer and now the boxing coach of Manny Pacquiao acquired Parkinson in 1990. But it effects differently, he never shakes and can talk almost normally. It is said that Roach can control the disease through medication, injections and actively training other fighters. His excellent eye coordination slowed down the disease as what the doctors said