Parkinson Disease
One Day in Parkinsons Life

Causes and risk factors of Parkinson’s disease

A discussion of the genetic, environmental and lifestyle factors that influence the risk of Parkinson’s disease.

Inhaltsverzeichnis

Genetics, environment and more

Parkinson’s disease affects millions of people worldwide, but its causes are still not fully understood. What we do know is that there is no single cause of Parkinson’s, but that a combination of genetic, environmental and lifestyle factors play a role. In this article, I will look at the main risk factors that contribute to the development of Parkinson’s disease and explain how they influence risk. I will look at genetic aspects as well as the role of environmental factors and lifestyle habits.

Genetic factors

Inheritable mutations

It is assumed that around 10-15% of Parkinson’s cases are due to genetic causes. Researchers have identified several genes that increase the risk of developing Parkinson’s disease. Among the most important are:

  • SNCA: Mutations in the SNCA gene lead to defective production of the protein alpha-synuclein, which accumulates in nerve cells and has a toxic effect on the brain. This mutation is rare, but when it occurs, it significantly increases the risk of developing Parkinson’s disease.
  • LRRK2: This gene is responsible for one of the most common genetic variants of Parkinson’s disease. Mutations in the LRRK2 gene are mainly found in people with a family history of Parkinson’s disease, but can also occur in people without a family history.
  • PARK2, PARK7 and PINK1: These genes are also associated with Parkinson’s disease and are often found in patients who develop the disease at a young age.

Risk for family members

If a genetic mutation is present, there is an increased risk of close relatives also developing Parkinson’s disease. However, this does not mean that everyone who carries a mutation in these genes will necessarily develop the disease. Genetic predispositions increase the risk, but the disease often only develops in combination with other factors such as environmental and lifestyle factors.

Personal observation

In my work, I have met people whose family history indicates genetic Parkinson’s disease. The realisation that there is a genetic predisposition often led to anxiety among the affected family members. It is important to realise that even if there is a genetic risk, there are ways to influence this risk through early prevention and healthy lifestyle habits.

Environmental factors

In addition to genetic influences, environmental factors play a decisive role in the development of Parkinson’s disease. Numerous studies have shown that certain toxic substances can increase the risk of developing Parkinson’s disease.

Pesticides and herbicides

A large number of studies have shown a link between exposure to pesticides and an increased risk of Parkinson’s disease. People who work in agriculture or live in rural areas where pesticides are commonly used are at higher risk. The most commonly studied chemicals include

  • Paraquat: A powerful herbicide used in many countries that has been linked to a significantly higher risk of Parkinson’s disease.
  • Rotenone: Another chemical that has been shown to damage the mitochondria of cells and has been linked to the development of Parkinson’s disease.

Industrial chemicals

In addition to pesticides, other industrial chemicals such as trichloroethylene (TCE) have also been linked to a higher risk of Parkinson’s disease. TCE is a solvent used in various industrial processes and can damage the central nervous system.

Head injuries

Studies have shown that people who have suffered severe head injuries have a higher risk of developing Parkinson’s disease. This could be because injuries to the brain lead to inflammation, which can damage the dopamine-producing cells in the brain. Repeated head injuries, such as those suffered by athletes, could increase the risk even further.

Personal observation

I have heard many stories of people who grew up in rural areas or worked in agriculture and later developed Parkinson’s disease. These cases underline the importance of preventative measures in agriculture and minimising the use of hazardous chemicals. It is encouraging to know that measures are being taken in many countries to limit the use of such substances.

Lifestyle factors

Exercise

A healthy lifestyle can reduce the risk of many diseases, and Parkinson’s is no exception. Studies have shown that regular physical activity has a protective effect on the brain. Exercise can help to maintain motor function and reduce the risk of neurodegenerative diseases such as Parkinson’s.

People who exercise regularly or are physically active have a lower risk of developing Parkinson’s disease. Exercise not only promotes general health, but also supports the nervous system by improving blood circulation and supplying the brain with oxygen.

Nutrition

There is evidence that certain diets can influence the risk of Parkinson’s disease. For example, a Mediterranean diet rich in antioxidants, omega-3 fatty acids and fibre is thought to have a protective effect. Antioxidants help to reduce oxidative stress, which plays a role in the breakdown of nerve cells.

Another interesting aspect is the consumption of coffee and tea. Studies have shown that people who regularly consume caffeinated drinks have a lower risk of Parkinson’s disease. It is thought that caffeine has neuroprotective properties and may slow down the loss of dopamine in the brain.

Smoking and alcohol consumption

Interestingly, studies have shown that smoking appears to reduce the risk of Parkinson’s, although of course it is not recommended as a preventative measure due to other health risks. The reason for this link is not fully understood, but it is thought that nicotine may have a protective effect on dopamine-producing cells.

Alcohol consumption, on the other hand, shows no clear link to Parkinson’s risk. Some studies suggest a lower risk with moderate alcohol consumption, while others have found no link.

Personal observation

In conversations with Parkinson’s patients, I have often found that those who led an active lifestyle prior to diagnosis are able to maintain their motor skills for longer. It has been shown time and time again that exercise and a balanced diet not only have a preventative effect, but can also slow down the progression of the disease.

Age and gender

Age as the most important risk factor

Age is the biggest risk factor for Parkinson’s disease. Most people are diagnosed at the age of 60 or older. The risk of developing Parkinson’s increases significantly with age, as the dopamine-producing cells naturally decline with age.

Gender

Men are around 1.5 times more likely to develop Parkinson’s disease than women. Why this is the case is not fully understood, but it is assumed that hormonal differences and genetic factors could play a role. Oestrogen, the female sex hormone, could have a protective effect on nerve cells, which would explain why women are less likely to be affected.

Conclusion

The causes of Parkinson’s disease are diverse and include a combination of genetic, environmental and lifestyle factors. While genetic mutations can increase the risk of the disease, environmental factors such as exposure to pesticides and head injuries also play a significant role. At the same time, studies show that a healthy lifestyle that includes regular exercise and a balanced diet can reduce the risk of developing Parkinson’s disease.

It is important that we are aware of the risk factors so that we can take preventative measures and manage the progression of the disease in those affected in the best possible way. With an increased understanding of the causes and risk factors, it will hopefully be possible to develop even more effective prevention and treatment strategies in the future.

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