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The association between food variety and nutrient intake/health status among rural women was tested in two agro-ecological settings in Vietnam. Special emphasis was placed on the significance of wild vegetables 'Rau Dai' in micronutrient supply and on the usefulness of food variety analysis in determining their current role. Data from 7-day food frequency interviews and a nutrition/health survey with 93 and 103 rural women in the Mekong Delta and the Central Highlands, respectively, were used in the analysis. Energy and nutrient intakes in the groups with the highest food variety score (FVS) (high = > or = 21) in the two regions were compared to those with the lowest food variety score (low = < or = 15). The high FVS groups in both regions also had a more diversified diet in terms of food categories. With the exception of low iron and riboflavin intakes in all groups, the high FVS groups had relatively adequate diets. A large variety of vegetables was used and only approximately half of the vegetable species were cultivated. In both regions the high FVS groups used a significantly greater variety of vegetables than the low FVS groups. Wild vegetables contributed significantly to the overall micronutrient intakes, mostly carotene, vitamin C and calcium intakes, but only the contribution to carotene intake was significantly higher in the high FVS group. Overall, we conclude that a food variety analysis is a useful tool in capturing the dietary role of wild vegetables.

Data on the overall dietary folate intakes among high-risk groups in poor countries is very limited. Vegetables are considered good sources but the evaluation of their contribution is hampered by the lack of data on folate concentrations in many traditional foods. Data on the analysis of folate concentrations in 16 wild vegetables used in the Mekong Delta and the Central Highlands in Vietnam and an evaluation of the relative importance of different foods in folate intakes of women is presented. Vegetable samples were collected in four study villages, blanched and frozen samples were transported to Sweden for analysis. Freeze-dried samples were analysed for total folate quantification using a commercial radio protein binding assay. Daily folate intakes among women were estimated from 7-day food frequency interviews with 213 women. The folate concentration in the vegetable samples ranged from 10 to 96 microg/100 g. The mean estimated daily folate intake among the 213 women in the study areas was 251 microg. Vegetables contributed approximately one-third of the daily folate intake, of which 72% and 42%, respectively, in the two regions was from wild vegetables. A majority of the women (87%) got some dietary folate from wild vegetables and nearly one-third had mean daily folate intakes of > 50 microg from such hidden food sources. The evaluation of dietary folate is complicated by data gaps in food composition tables, the unreliability of existing food data, variations between methods used for folate analysis and limited understanding of the bioavailability of food folate.