Shared breastfeeding & other early multiple sclerosis risk factors: A case-control study

Area of Science:

• Neurology
• Immunology
• Epidemiology

Background:

• Multiple sclerosis (MS) is a chronic inflammatory autoimmune disease with complex etiology.
• Genetic and environmental factors are believed to interact, influencing MS development.
• Early life exposures are potential modifiable risk factors for MS.

Purpose of the Study:

• To investigate the association between various early life factors and the risk of developing MS.
• To evaluate culture-specific and common environmental exposures in childhood.
• To identify potential early life risk or protective factors for MS.

Main Methods:

• An age- and sex-matched case-control study was conducted in Riyadh, Kingdom of Saudi Arabia.
• 300 MS cases and 601 controls were enrolled.
• Data on demographics, breastfeeding, consanguinity, and other environmental factors were collected via questionnaire and analyzed using logistic regression.

Main Results:

• Shared breastfeeding (OR=0.58) and older age at school entry (OR=0.83) were associated with decreased MS risk.
• Longer breastfeeding duration by the mother (OR=1.03), higher sibling rank (OR=1.69), and more household members at birth (OR=2.32) were linked to increased MS risk.
• MS patients were less likely to have received formula with breastfeeding (OR=0.72).

Conclusions:

• Early life factors significantly contribute to the risk of developing MS.
• Novel associations with shared breastfeeding and number of household members at birth warrant further investigation.
• These findings underscore the importance of early life environmental exposures in MS pathogenesis.