Parkinson’s strikes more men than women. Researchers have worked for decades to learn why.

It is well established that exposure to environmental toxins — pesticides and industrial solvents, for example — raises the likelihood of Parkinson’s, as well as aging, head trauma, and to a lesser extent, genetics. The latter, which often can significantly influence many diseases, seems to play only a minor role in Parkinson’s, except perhaps in early onset. “There are about 26 or 27 known genetic mutations in Parkinson’s, but they account for only a minority of cases, from 3 to 10 percent,” Savica says.

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