Fish consumption and cognitive decline with age in a large community study

Area of Science:

• Gerontology
• Nutritional Neuroscience

Background:

• Dietary fish and omega-3 fatty acids are linked to reduced risk of Alzheimer disease and stroke.
• Investigating the protective effects of fish and omega-3 fatty acids on cognitive health is crucial for aging populations.

Purpose of the Study:

• To determine if fish and omega-3 fatty acid intake protects against age-related cognitive decline.
• To analyze the association between fish consumption and cognitive decline rates in older adults.

Main Methods:

• Prospective cohort study involving community-dwelling residents aged 65 years and older.
• Cognitive function was assessed 3 times over 6 years using a global cognitive score derived from 4 standardized tests.
• Statistical analysis utilized mixed models to estimate cognitive decline rates and adjust for various lifestyle and health factors.

Main Results:

• Cognitive scores declined at an average rate of 0.04 standardized units per year.
• Higher fish intake was associated with a slower rate of cognitive decline, with 2 or more fish meals per week showing a 13% slower decline.
• The association between fish intake and slower cognitive decline persisted after adjusting for cardiovascular factors and fruit/vegetable intake, but was modified by fat intake. Omega-3 fatty acids showed little association with cognitive change.

Conclusions:

• Fish consumption may be associated with a slower rate of age-related cognitive decline.
• Further research is needed to elucidate the specific dietary components, such as fat composition, responsible for this association.