Parasitic infestation
The effect of parasitic infestation was not assessed in this study because deworming was only done after the intervention,
but the data were analyzed for the relation between intensity of Ascaris infection and changes in biochemical indexes. In the fruit group we found that when the infection intensity was high, the increase in serum retinol concentrations tended to be smaller. However, we did not find such a trend for serum retinol in the other 3 groups, nor for serum b-carotene in any of the groups. It was shown previously that absorption of retinol is relatively insensitive to parasitic infestation (29). The absence of a relation between parasitic infestation and changes in serum b-carotene in the vegetable group may indicate that, in this group, parasitic infestation had a relatively small effect on the already complicated process of freeing b-carotene from leafy vegetables. In the fruit group, it appeared that freeing and absorption of b-carotene were relatively undisturbed, but that its bioconversion was affected. Jalal (30) reported that deworming markedly increased
serum retinol concentrations after consumption of red sweet potato when Ascaris infection was high but not when it was low. The interaction between parasitic infestation and bioavailability and bioconversion of carotenoids needs further study because parasitic infestations are highly prevalent in areas where vegetables and fruit are the main source of dietary vitamin A.
Parasitic infestationThe effect of parasitic infestation was not assessed in this study because deworming was only done after the intervention,but the data were analyzed for the relation between intensity of Ascaris infection and changes in biochemical indexes. In the fruit group we found that when the infection intensity was high, the increase in serum retinol concentrations tended to be smaller. However, we did not find such a trend for serum retinol in the other 3 groups, nor for serum b-carotene in any of the groups. It was shown previously that absorption of retinol is relatively insensitive to parasitic infestation (29). The absence of a relation between parasitic infestation and changes in serum b-carotene in the vegetable group may indicate that, in this group, parasitic infestation had a relatively small effect on the already complicated process of freeing b-carotene from leafy vegetables. In the fruit group, it appeared that freeing and absorption of b-carotene were relatively undisturbed, but that its bioconversion was affected. Jalal (30) reported that deworming markedly increasedserum retinol concentrations after consumption of red sweet potato when Ascaris infection was high but not when it was low. The interaction between parasitic infestation and bioavailability and bioconversion of carotenoids needs further study because parasitic infestations are highly prevalent in areas where vegetables and fruit are the main source of dietary vitamin A.
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