Association between egg consumption and cognitive function among Chinese adults: long-term effect and interaction effect of iron intake

Abstract

The association between egg consumption and cognitive function is inclusive. We aimed to assess the association between egg consumption and cognitive function in Chinese adults and tested the interaction between egg consumption and Fe intake. The data used were from a nationwide sample (n 4852, age ≥ 55 years) from the China Health and Nutrition Survey between 1991 and 2006. Assessment of cognitive function was conducted in 1997, 2000, 2004 and 2006. Dietary egg intake was obtained by 24-h dietary recalls of 3 consecutive days during home visits between 1991 and 2006. Multivariable mixed linear regression and logistic regression were used. Egg intake was positively associated with global cognitive function. In fully adjusted models, across the quartiles of egg intake the regression coefficients were 0, 0·11 (95 % CI –0·28, 0·51), 0·79 (95 % CI 0·36, 1·22) and 0·92 (95 % CI 0·43, 1·41), respectively. There was a significant interaction between egg intake and Fe intake. The association between high egg intake and cognitive function was stronger among those with low Fe intake than those with high Fe intake. In addition, there was a significant interaction between egg consumption and sex, with the association mainly observed in women but not men. Furthermore, compared with non-consumers, those with higher egg consumption (Q4) had the OR of 0·93 (95 % CI 0·74, 1·19), 0·84 (95 % CI 0·69, 1·02) for self-reported poor memory and self-reported memory decline, respectively. Higher egg intake is associated with better cognition in Chinese adults among those with low Fe intake.

Nutritional Status and Physical Exercise Are Associated with Cognitive Function in Chinese Community-Dwelling Older Adults: The Role of Happiness

“…Modifiable lifestyle factors such as nutritional status and physical activity, especially exercise, have been recognized as protective factors against cognitive decline [ 1 ]. An extensive amount of literature has underscored the link between nutritional status and cognitive decline [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. Both cross-sectional [ 2 , 3 , 4 ] and longitudinal [ 5 ] studies from various populations consistently reported correlations between malnutrition or nutritional risks and higher levels of cognitive decline, whereas the dietary intake of nutrient-rich foods including tea [ 6 ], egg [ 7 ], fruits, milk, and yogurt [ 8 , 9 ] is associated with reduced risks of cognitive decline.…”

“…An extensive amount of literature has underscored the link between nutritional status and cognitive decline [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. Both cross-sectional [ 2 , 3 , 4 ] and longitudinal [ 5 ] studies from various populations consistently reported correlations between malnutrition or nutritional risks and higher levels of cognitive decline, whereas the dietary intake of nutrient-rich foods including tea [ 6 ], egg [ 7 ], fruits, milk, and yogurt [ 8 , 9 ] is associated with reduced risks of cognitive decline. Furthermore, intervention studies, implementing diverse dietary patterns, have demonstrated efficacy in attenuating the progression of cognitive deterioration [ 1 , 10 , 11 ].…”

Nutritional Status and Physical Activity are Associated with Cognitive Function in Chinese Community-Dwelling Older Adults: the Role of Happiness

“…Extensive literature has underscored the link between nutritional status and cognitive decline. Cross-sectional studies from various populations including Canadian, Greek, Singaporean, and Chinese [1][2][3][4] consistently reported correlation between malnutrition or nutritional risks and higher level of cognitive decline, whereas dietary intake of nutrient-rich foods including tea [5], egg [6], fruits, milk, and yogurt [7,8], is associated with reduced risks of cognitive decline. Furthermore, intervention studies, implementing diverse dietary pa erns, have demonstrated efficacy in a enuating the progression of cognitive deterioration [9][10][11].…”