Basu T K, Donald E A, Hargreaves J A, Thompson G W, Overton T R, Chao E, Peterson D
J Nutr Elder. 1992;11(4):5-19. doi: 10.1300/j052v11n04_02.
Vitamin B12 and folate status was determined in 50 male and 47 female free-living subjects (65-77 years) in winter and summer. The mean intake calculated from 3-day food records met the Canadian recommended intake (RNI) for both gender and season, however, probability analysis of dietary data revealed a number of subjects at risk of deficiency. Although the mean plasma levels were within the acceptable range for both vitamins, some 9 to 14% of individual subjects had folate plasma levels below normal. Fewer subjects had subnormal plasma vitamin B12 levels. Although mean values for dietary intake and plasma concentration of folate and vitamin B12 may indicate nutritional adequacy, a proportion of an older population may be at nutritional risk.
在冬季和夏季，对50名男性和47名女性（65 - 77岁）的自由生活受试者进行了维生素B12和叶酸状况测定。根据3天食物记录计算出的平均摄入量在性别和季节上均符合加拿大推荐摄入量（RNI），然而，饮食数据的概率分析显示有若干受试者存在缺乏风险。尽管两种维生素的血浆平均水平都在可接受范围内，但约9%至14%的个体受试者叶酸血浆水平低于正常。血浆维生素B12水平低于正常的受试者较少。尽管叶酸和维生素B12的饮食摄入量及血浆浓度的平均值可能表明营养充足，但一部分老年人群可能存在营养风险。
