A study finds out that high levels of homocysteine make a patient with Parkinson’s disease more likely to suffer from depression.
We already know that elevated levels of the amino acid homocysteine are a risk factor for dementia and Alzheimer’s disease. And high levels are also linked to impaired cognition, even if people don’t actually have dementia. Those with Parkinson’s disease are at risk of elevated homocysteine because of the drugs they take.

Researchers at the University of Texas Southwestern Medical Center report on how high homocysteine affects Parkinson’s patients...about one third of a group of 97 patients had elevated levels. These patients were more depressed than those with normal homocysteine and were more likely to have impaired cognition. The higher levels of homocysteine were linked to medication and is something that perhaps should be taken into account when planning treatment.

http://www.tele-management.ca/2013/0...nd-depression/