Low intakes of vegetables and fruits, especially citrus fruits, lead to inadequate vitamin C intakes among adults.
OBJECTIVE
To determine vitamin C intakes among adults and to identify differences in dietary intake associated with vitamin C consumption.


METHODS
This cross-sectional study compared vitamin C intake, nutrient intake, and food group choices of adults with low (<30 mg/d), marginal (30-60 mg/d), and desirable (>60 mg/d) vitamin C intakes.


METHODS
Data from 2472 men and 2334 women aged 25-75 y were obtained from the 1994-1996 Continuing Survey of Food Intakes by Individuals (CSFII).


RESULTS
Overall, 18% of the sample had low vitamin C intakes, 24% had marginal intakes, and 58% had desirable intakes. In addition to consuming less vitamin C, adults with low vitamin C intakes consumed significantly less (P</=0.001) energy-adjusted (ie nutrient/1000 kcal) folate, fiber, beta-carotene, and vitamin B6, and significantly more (P<0.001) fat. Compared to adults with low intakes, adults with desirable vitamin C intakes consumed significantly more (P</=0.001) high-vitamin C fruit juice and low-vitamin C vegetables, while consuming significantly less (P</=0.009) soft drinks, coffee/tea and alcoholic beverages. On average, adults with desirable vitamin C intakes consumed more than five daily servings of vegetables and fruits, of which more than one was citrus. Adults with low and marginal vitamin C intakes consumed less than one-fifth of a serving of citrus.


CONCLUSIONS
A considerable number of adults under-consume vitamin C and total vegetables and fruits. Nutritionists should continue to promote five to nine daily servings of vegetables and fruits, at least one of which should be rich in vitamin C.
Department of Nutrition, Arizona State University, Box 872502, Tempe, AZ 85287-2502, USA.
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Taylor
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Hampl
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Johnston
D000328:Adult; D000368:Aged; D001205:Ascorbic Acid / Q000008:administration & dosage*; D001206:Ascorbic Acid Deficiency / Q000517:prevention & control*; D002957:Citrus; D003430:Cross-Sectional Studies; D004032:Diet / Q000592:standards* / Q000706:statistics & numerical data / Q000639:trends; D004034:Diet Surveys; D005247:Feeding Behavior; D005260:Female; D005638:Fruit; D006801:Humans; D008297:Male; D008875:Middle Aged; D014675:Vegetables
D001205:Ascorbic Acid