SUMMARY
The objective of this study was to verify if the low zinc intakes reported for the urban Amazon are associated with low serum zinc levels. A survey was carried out amongst the low salaried workers of four Manaus factories. Two of these factories provided meals and medical assistance. The mean and median dietary zinc intakes were 54.7% and 49.3% respectively of the American RDA. Zinc intakes were higher in those workers born in Manaus, that were better educated and that came from higher income families but these differences were only apparent in factories that didn't provide meals. Zinc intake decreased with age in both men and women, being higher in men than women in all age groups. These trends were observed in all factories. No significant difference was found between serum zinc levels for men and women. Whilst serum zinc values tended to decline with age in both sexes, there was no significant correlation with age in either sex. Mean serum zinc levels of low and medium family income workers were significantly lower than high family income workers. (P<.001 P<.05). 34% of all low family income, 26% of medium family income and 17% of high family income workers had deficient serum zinc levels (<11.5 μmol/l).
Serum zinc concentrations were related to zinc intake in male (r = 0.26 p<.02) but not female workers (r=0.11 p<.1). Zinc intakes of male and female workers with deficient serum zinc levels were significantly lower than those with normal serum zinc levels. Zinc intakes of male workers were higher than those of female workers at all serum zinc levels.