The purpose of this study was to elucidate the dietary factors that influence the whole blood rheology. Data were obtained from 33 vegetarian and 63 omnivorous middle-aged voluntary women. The blood rheology was evaluated by measuring the passage time of the whole blood with a microchannel array flow analyzer (MC-FAN). A factor analysis using principal components extraction with promax rotation was performed on the variables of physique, body composition, hematological parameters, nutrient intake, and food intake. Ten components were extracted and subjected to path analysis. The hypothesized model fitted well (GFI, AGFI, RMR, RMSEA, and AIC). The results showed that “serum lipids,” “serum proteins” and “less consumption of beans and green vegetables” directly increased the passage time of the whole blood. “Obesity” was strongly affected by “consumption of animal foods,” and “serum lipids” were affected by “obesity.” So “obesity” and “consumption of animal foods” indirectly increased the passage time. These findings are consistent with the hypothesis that the vegetarian diet directly and indirectly stimulates the blood rheology and subsequently decreases the risk of impairing the microcirculation.
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