Parkinson: Nieuw onderzoek wijst op rol leefomgeving en luchtverontreiniging

Each year, approximately 3,700 people in the Netherlands receive a Parkinson’s disease diagnosis. This translates to roughly ten families each day facing the news, a situation described as “a drama” given the debilitating nature of the illness by researcher Prof. Bas Bloem, a neurologist at Radboudumc.

Rising Prevalence, Stable Incidence

While the number of new Parkinson’s cases annually isn’t increasing in the Netherlands – a contrast to trends observed in countries like China and the United States – the overall number of people living with the condition is growing. Currently, around 63,000 individuals in the Netherlands are affected, experiencing symptoms ranging from tremors and muscle stiffness to mood changes and sleep disturbances.

Prof. Bloem uses a metaphor to illustrate the situation: “The water level in the bathtub is rising because the tap is constantly open.” He explains that while an aging population contributes to new cases, improved care is leading to decreased mortality among those already diagnosed, a finding demonstrated by his team last year.

The Role of Environment

Researchers analyzed data from healthcare claims, medication usage, hospital admissions, and mortality rates to map the prevalence of Parkinson’s disease at the neighborhood level. Prof. Roel Vermeulen, a environmental epidemiologist at the Institute for Risk Assessment Sciences (IRAS), part of Utrecht University, stated, “This is the first time we have registered this in the Netherlands.” The study was published in The Lancet Regional Health – Europe.

The data covers the period from 2017 to 2022. Vermeulen added that they plan to continue monitoring Parkinson’s disease using their developed methodology, hoping to identify the causes of the disease and potentially reduce the number of new cases.

Geographic Variations

The research reveals a non-uniform distribution of Parkinson’s disease across the Netherlands. The northern provinces of Groningen and Friesland, along with the regions of Leiden and Wageningen, show relatively higher rates of the disease. Conversely, areas like Zeeland exhibit lower prevalence.

Vermeulen concludes, “We can at least conclude that the distribution of Parkinson’s is not evenly distributed across the country.” This suggests that environmental factors play a significant role in the development of Parkinson’s disease, prompting further investigation into the causes of these regional differences.

Beyond Pesticides: A Multifaceted Issue

Agricultural pesticides, such as glyphosate, have long been suspected as potential contributors to the disease. However, the research indicates that areas with extensive agriculture, like Zeeland and the northern part of North Holland, do not consistently show high Parkinson’s rates. Vermeulen cautions that this doesn’t exonerate pesticides, but rather highlights the presence of multiple contributing factors, including air pollution and heavy metals.

Prof. Bloem echoes this sentiment, stating, “This research does not absolve agriculture. The current place of residence on the map offers only a snapshot, while the risk of Parkinson’s is determined over decades. In the international literature, the evidence for a link between pesticides and Parkinson’s is overwhelming.”

Researchers at Radboudumc and IRAS plan to conduct further research, examining 1500 newly diagnosed patients, looking at their residential history, work environments, dietary habits, and measuring chemical concentrations in their homes. They also intend to assess genetic predispositions.

Bloem believes it’s possible to reduce the incidence of the disease, noting that Parkinson’s was once rare. The condition was first described by British physician James Parkinson in 1817. He points out that the disease is now appearing in individuals in their thirties, with one in three patients being under the age of 65, emphasizing the need to return the disease to its former rarity.

Frequently Asked Questions

How many people are diagnosed with Parkinson’s disease each year in the Netherlands?

Approximately 3,700 people in the Netherlands are diagnosed with Parkinson’s disease annually, equating to about ten families receiving this diagnosis each day.

Is the number of Parkinson’s cases increasing in the Netherlands?

The number of *new* Parkinson’s cases each year is not increasing in the Netherlands, unlike the trends seen in countries like China and the United States. However, the *total* number of people living with the disease is rising.

What factors are being investigated as potential causes of Parkinson’s disease?

Researchers are investigating environmental factors such as air pollution, heavy metals, and pesticides, as well as genetic predispositions, to understand the causes of Parkinson’s disease.

What role does your environment play in your overall health and well-being?