Vertical Association Between Dietary Total Choline and L-alpha-glycerylphosphorylcholine and the Cognitive Function in Chinese Adults Aged over 55, Result from China Health and Nutrition Survey 1997-2018.

Background: With the aging process in China showing an accelerated trend, cognitive decline and impairment have become a major issue in older people. Dietary choline supplement may be a changeable lifestyle to improve this situation.

Method: We analyzed 7659 adults aged over 55 in the China Health and Nutrition Survey (CHNS), evaluated cognitive function by the global cognition score, and found the association between cognitive function and dietary intake of total choline or L-alpha-glycerylphosphorylcholine (GPC). Linear and logistic mixed models with three levels were applied to analyze the association between dietary total choline/GPC intake and global cognition score, and the risk of poor cognition.

Results: The average dietary intake at baseline was 178.8 mg/d for total choline, and 16.3 mg/d for GPC. After an average follow up of 6.8 years, we found that higher intake of total choline (β = 0.083, 95%CI: 0.046,0.119, < 0.001) and GPC (β = 0.073, 95%CI: 0.034-0.111, < 0.001) had positively associated with global cognitive scores. Additionally, higher intake of total choline had a better effect on improving the cognitive function of women (β = 0.092, 95%CI: 0.042-0.142, < 0.01) and individuals between 55-65 years old (β = 0.089, 95%CI: 0.046-0.132, < 0.01). However, higher GPC intake had a better effect on the cognitive function of men (β = 0.080, 95%CI: 0.020-0.141, < 0.05). Higher total choline intake had a protective factor against poor cognition (OR = 0.762, 95%CI: 0.676,0.860, < 0.001); the protective effect was more pronounced for women (OR = 0.750, 95%CI: 0.639,0.879, < 0.001) and individuals aged 55-65 (OR = 0.734, 95%CI: 0.636-0.848, < 0.001).

Conclusions: higher dietary choline and GPC intake were beneficial for cognitive function, although we found that higher dietary choline was more effective in improving global cognitive scores at older ages; dietary choline should be supplemented as early as possible in old age to prevent poor cognition.