NEW ORLEANS—A diet high in fruits, vegetables, legumes, and whole grains and low in sugar and red meat is associated with less disability and fewer depressive symptoms in patients with multiple sclerosis (MS), according to research presented at the 31st Annual Meeting of the Consortium of MS Centers.
Ruth Ann Marrie, MD, PhD
“Our findings suggest that people with MS who have a healthier diet have less disability, and that a generally healthy lifestyle is associated with a lower burden of severe depression, pain, fatigue, and cognitive problems. Therefore, modifying diet may offer a way of improving symptoms,” said Ruth Ann Marrie, MD, PhD, Associate Professor of Neurology and Director of the MS Clinic at the University of Manitoba in Winnipeg, Canada.
Many patients with MS ask whether their diet could influence their disease status. To address this question, Dr. Marrie and colleagues assessed the association between overall diet quality and disability and physical and mental functioning in a large cohort of people with MS. They conducted a cross-sectional study of North American Research Committee on MS (NARCOMS) registry participants who had completed a dietary screener questionnaire. The questionnaire, created by the National Health and Nutrition Examination Survey, provides an assessment of diet composition when full information on diet is unavailable. The survey estimates intake of fruits, vegetables and legumes, whole grains, added sugars, and red and processed meats.
The researchers constructed an overall diet-quality score based on responses to the questionnaire and assigned participants to sex-specific quintiles of each of the questionnaire’s five food groups. They then assigned scores for fruits, vegetables, legumes, and whole grains based on the patient’s quintile ranking. The investigators inverted scores for red and processed meats and added sugar. The researchers summed individual food-group scores to obtain an overall diet score, ranging from 4 (poor quality) to 20 (high quality).
Dr. Marrie and colleagues assessed the association between diet quality and disability status (using the Patient-Determined Disease Steps) and mental and physical functioning (ie, depression, fatigue, cognition, mobility, vision, pain, spasticity, tremor, and sensory function) using proportional odds models adjusting for age, gender, income, BMI, smoking status, and disease duration.
In all, 7,418 responders had an average quality-diet score of 11.9. Patients with higher scores tended to be older, leaner, and nonsmokers. People with diet-quality scores in the top quintile had lower levels of disability and lower depression scores. Diet-quality scores were not associated with other physical or mental functioning scores, however.
A lack of details about potentially important dietary factors, such as types of fat, is one limitation of the study, said Dr. Marrie.
“While our study does not prove that diet change will improve symptoms, a high-quality diet that emphasizes intake of fruits, vegetables, and whole grains, and lower intake of red meat, can be encouraged, given the known benefits for general health,” said Dr. Marrie. “Future studies should look at the relationship between diet and disability, as well as symptoms over time, so that we can establish whether changing diet will improve outcomes in MS. These studies should also look at diet in more detail.”
The National MS Society supported this study.
—Erica Tricarico