A decrease in body mass index is associated with faster progression of motor symptoms and shorter survival in ALS

Area of Science:

• Neurology
• Clinical Medicine
• Epidemiology

Background:

• Amyotrophic Lateral Sclerosis (ALS) is a progressive neurodegenerative disease.
• The relationship between body mass index (BMI) and ALS clinical course requires further investigation.

Purpose of the Study:

• To test the hypothesis that changes in body mass index (BMI) are associated with the clinical course of ALS.
• To examine the relationship between baseline BMI, BMI changes, and ALS clinical variables including age of onset, progression rate, and survival.

Main Methods:

• Retrospective analysis of BMI at first clinical visit and up to two-year follow-up.
• Classification of baseline BMI using World Health Organization (WHO) criteria.
• Categorization of BMI changes into loss (>1 unit), no change, or gain (>1 unit).

Main Results:

• Baseline BMI was not associated with age of onset, ALS progression rate, or survival.
• A loss of BMI greater than 1 unit over two years was significantly associated with shorter survival and a faster rate of progression.
• These findings remained significant in a multiple regression model, independent of gender, site of onset, diabetes, and ApoE genotype.

Conclusions:

• Changes in BMI after ALS diagnosis are significantly associated with disease progression rate and survival.
• Early detection of BMI changes may identify ALS patients with a more malignant disease course.
• Further research is needed to elucidate the complex relationship between BMI and ALS progression.