Can a Healthy Diet Prolong the Onset of Parkinson’s Disease?

Highlights:

Parkinson’s disease is a progressive, neurological condition that mainly affects movement
Some of its first signs like impaired color vision, constipation and anxiety can appear ten years prior the movement problems
A healthy diet could delay or even prevent the development of Parkinson's disease among people who have these preceding symptoms already

Parkinson's is a progressive, degenerative neurological disease that affects movement. One of the disease's first symptoms is a tremor in one hand and feeling of stiffness in the body, which can progress to dementia in the later stages. Most of these symptoms are a result of a drop in the level of dopamine.

Though movement problems mainly characterize Parkinson's disease, people with the disease often have non-motor symptoms such as constipation, daytime sleepiness, and depression. These preceding symptoms can appear ten or more years before the movement problems start.

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‘Eating more vegetables, nuts, legumes, and not consuming red meat are associated with a lower risk of having three or more of the preceding symptoms of Parkinson’s disease. These preceding symptoms are those that generally appear ten years before the onset of movement symptoms.’
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According to the new study, eating a healthy diet during middle age lowers the risk of having these preceding symptoms. The study is published in the online issue of Neurology®, the medical journal of the American Academy of Neurology.

"While this study does not show cause and effect, it certainly provides yet another reason for getting more vegetables, nuts and legumes in your diet," said study author Samantha Molsberry, Ph.D., of Harvard University in Boston, Mass. "More research is needed to determine whether eating a healthy diet could delay or even prevent the development of Parkinson's disease among people who have these preceding symptoms already."

Study

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The study involved 47,679 people whose dietary intake was monitored every four years, starting in the 1980s when they were middle-aged.

People followed either alternate Mediterranean diet, which is similar to the Mediterranean diet but includes only whole grains and does not consider dairy, or the Alternative Healthy Eating Index. Both diets encourage eating fruit, vegetables, whole grains, nuts, and legumes and discourage eating red meat.

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Participants were divided into five groups based on how closely they followed their diet. They were tracked closely by researchers.

In 2012, people were checked for two common conditions of Parkinson's disease, constipation and a sleep disorder called rapid-eye movement sleep behavior disorder, characterized by acting out dreams during sleep by movement, such as flailing arms or shouting or screaming.

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In 2014-2015, 17,400 of the participants were asked about five more symptoms that can precede Parkinson's disease, loss of sense of smell, impaired color vision, excessive daytime sleepiness, body pain and depression.

Findings

People who had the highest adherence to the diets were less likely to have three or more symptoms that precede Parkinson's disease than the people with the lowest adherence.

People in the high group for adherence to the Mediterranean diet were 33% less likely to have three or more symptoms than those in the low adherence group. These results were adjusted for other factors that could affect the risk of developing these preceding symptoms, such as physical activity, smoking and body mass index (BMI).

A similar strong relationship among those following the Alternative Healthy Eating Index diet pattern and having three or more of these non-motor symptoms.

There were 29,899 women in the study. In the low adherence group, 37% had constipation, compared to 32% of the high adherence group. Among the 11,493 women with all of the non-motor symptoms measured, 15% of the low group had body pain, compared to 13% of the high group. In the same 11,493 women, 17% of the low group had symptoms of depression, compared to 14% of the high group.

Among the 17,770 men in the study, 22% in the low adherence group had constipation, compared to 12% of the high adherence group.

The study showed that eating more vegetables, nuts, legumes and consuming a moderate amount of alcohol were all associated with a lower risk of having three or more of the preceding symptoms. Moderate alcohol consumption meant one drink per day for women and no more than two drinks per day for men.

"We need to emphasize that, while these symptoms are associated with an increased risk of Parkinson's disease, especially in combination, experiencing any or several of these symptoms does not necessarily mean that a person will eventually develop Parkinson's disease," Molsberry said.

Source-Medindia