Canadian TV host steps down after 13 years due to Parkinson's: What is the disease?

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A longtime Canadian TV host is taking a small step away from his duties as Parkinson's disease impacts his health.

Harry Forestell, who hosts "CBC New Brunswick News at 6," took to X (formerly known as Twitter) on Wednesday to update his followers about his predicament.

"A new role but still here!" he began in his post, adding he's been hosting the supper-hour show for 13 years.

"Parkinson's is tightening its grip on my voice, but as long as I can talk, I'll continue to tell stories and be part of CBC News in N.B."

A video CBC News posted to YouTube on Wednesday indicated Forestell — who said his health is doing "remarkably well" nowadays — will now focus on mentorship and other special projects.

"It is a daily challenge," Forestell shared in that video, adding he's fortunate for the "endless parade" of people, including neurologists, physiotherapists and voice therapists, offering their help.

"Of course, I'm really humbled by the number of people who've reached out with Parkinson's to express their sympathy and their understanding. And also hearing from people who just want to reach out and express their support. It really has been a tremendous moral boost."

But what exactly is Parkinson's disease and how does the disorder impact a person's health? Read on to learn more.

What is Parkinson's disease?

According to the Alzheimer Society of Canada, Parkinson's disease is a progressive neurodegenerative disease primarily affecting the parts of the brain that control movement. Sometimes, it can lead to someone developing dementia in the later stages of the disease.

Movement is typically controlled by dopamine, a chemical that carries signals between nerves inside the brain. When cells that usually produce dopamine die, symptoms of Parkinson's disease arise.

What are the signs and symptoms of Parkinson's disease?

While symptoms of Parkinson's disease can vary, the most common include tremors, slowness, stiffness and balance problems. Other symptoms of the disorder include:

• Fatigue

• Soft speech

• Problems with handwriting

• Stooped posture

• Constipation

• Sleep disturbances

• Mood and personality changes

• Appetite changes

However, a diagnosis can take time and there are no x-rays or tests that can confirm the disease, according to Parkinson Canada. Instead, a neurologist will typically look at a patient's medical history and conduct tests to rule out other conditions.

Who's at risk of developing Parkinson's disease?

Ten million people worldwide are affected by Parkinson's disease, the Parkinson's Foundation said.

While the cause of the disease remains largely unknown, many scientists believe it's caused by a combination of genetic and environmental factors. The risk of developing the disease also increases if you have a close relative with Parkinson's disease.

The risk of developing it also increases with age, and men are more likely to get the disorder compared to women.

How is Parkinson's disease treated?

There is currently no known cure for Parkinson's disease. However, people with the disorder can live for many years.

Medications are often used in treating the symptoms of Parkinson's, including Levodopa to help lessen challenges with movement. Medications used for Alzheimer's disease can also be used to help improve any dementia symptoms associated with Parkinson's disease.

In some cases, surgery may be recommended for severe motor fluctuations. Therapeutic approaches may also be suggested to help people with physical function or speech.

How can I prevent Parkinson's disease?

While the key to preventing Parkinson's disease remains a mystery, scientists do know aging, stress and inflammation can cause cell damage and abnormal dopamine levels in the brain.

Keeping stress levels low is important in reducing inflammation in the body, while regular exercise and consuming a diet rich in fruits, vegetables and Omega-3 fatty acids may be beneficial.

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