Parkinson's disease has been linked to viruses, toxins and drugs - but new research suggests men who eat large amounts of dairy products are at greater risk of developing the condition. Interestingly, it doesn't affect women in the same way, even if they eat similar levels of dairy.
Researchers from Harvard School of Public Health found that men who ate 2.9 or more servings of dairy products a day had a far higher risk of developing Parkinson's than those who ate less than one serving a day. The link gets stronger over time, and seems to peak after six years of eating dairy. (Source: Annals of Nuerology, 2002; 52: 793-801).