Short nutrition course may improve life for Parkinson’s patients

A four-week nutrition education program focused on how food interacts with Parkinson’s disease medications was tied to improved physical and mental quality of life for patients, a small study in Turkey found.

The program helped participants adjust their eating habits, providing guidance on timing protein-rich meals around doses of levodopa, the main treatment for Parkinson’s disease. After the intervention, participants reported improved physical and mental well-being, along with changes in their nutrient intake.

The findings suggest that helping people with Parkinson’s understand food/medication interactions could improve their quality of life and dietary habits. However, the researchers cautioned that the study involved only 30 participants and lacked a comparison group, making it difficult to determine whether the improvements were attributable to the education program.

“To further validate and expand upon these promising findings, the long‐term efficacy of such targeted nutritional interventions should be demonstrated in future large‐scale, randomized controlled trials,” the researchers wrote.

The study, “Effects of food–drug interaction-oriented nutritional education on quality of life in Parkinson’s disease: A pilot quasi-experimental study,” was published in Nutrition in Clinical Practice.

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Levodopa and nutrition

Levodopa is the gold standard treatment for Parkinson’s. But what people eat, particularly protein-rich foods, can affect how well the medication works.

When protein is digested, it releases amino acids — the building blocks of proteins — that compete with levodopa for absorption in the intestine and transport into the brain, where the medication helps ease Parkinson’s symptoms. Certain minerals, such as iron, can also interfere with levodopa absorption, potentially making the medication less effective and symptoms harder to control.

Beyond these interactions, a healthy diet rich in fruits, vegetables, fiber, and unsaturated fats can support overall health and help manage certain symptoms such as constipation. Some dietary patterns have also been linked to slower disease progression.

“Consequently, it is essential to improve patients’ nutritional status and provide nutritional counseling/education, including potential food–drug interactions,” the researchers wrote. “Despite extensive literature on food interactions with levodopa, few intervention studies have examined the effect of patient education on this issue.”

The researchers recruited 30 people with Parkinson’s from community pharmacies in Konya, Turkey, from January to April 2024. Participants had a mean age of 66.8 and had received a Parkinson’s diagnosis a mean of three years earlier.

Each received a 30- to 45-minute, one-on-one nutritional education session focused on managing interactions between food and levodopa. Participants were advised to take levodopa at least 30 minutes before or one hour after meals and shift more of their daily protein intake to the evening, potentially reducing interference with daytime medication effects.

Participants also received advice on managing constipation and swallowing difficulties, maintaining a balanced diet, and taking iron supplements at least two hours before or after levodopa. Printed instructions and weekly follow-up calls reinforced the guidance.

Before the program and four weeks later, researchers collected three-day food records and assessed quality of life using the Short Form-12 questionnaire, which measures perceived physical and mental health. Higher scores indicate better health.

After four weeks, participants reported significant improvements in both aspects of quality of life.

Mean physical health scores rose from 37.6 points to 42.9 points, while mental health scores increased from 36.1 to 40.8. Both changes were considered moderate, according to the researchers.

Dietary intake also changed. Mean daily protein consumption fell from 63.4 grams to 53.2 grams, equivalent to a decrease from 0.87 to 0.78 grams per kilogram of body weight. Intake of certain amino acids that compete with levodopa for transport into the brain also declined.

The proportion of calories coming from carbohydrates increased, as did the ratio of carbohydrates to protein. This shift may be helpful because carbohydrates stimulate insulin release, which can lower levels of amino acids in the bloodstream that compete with levodopa for transport into the brain. Intake of saturated fats, generally considered less healthy than unsaturated fats, also declined.

However, their mean daily calorie intake fell from about 1,525 to 1,281 calories, despite calorie reduction not being the program’s goal. The researchers cautioned that sustained low intake could pose nutritional risks, particularly for older adults.

The findings suggest “that targeted nutritional counseling/education focusing on food–drug interactions can significantly enhance the quality of life and dietary behaviors of patients with [Parkinson’s],” the researchers wrote.

The study had limitations in addition to its small size and lack of a comparison group: Researchers did not directly measure levodopa absorption or changes in Parkinson’s symptoms, and food records could not confirm whether participants actually shifted protein intake to evening meals.

“Future large‐scale randomized controlled trials” are warranted to “validate these preliminary findings and ensure long‐term clinical sustainability,” the researchers wrote.