Habitual Protein Intake

In general, increases in habitual protein intake lead to increases in amino acid catabolism and deamination as well as an increase in the cycling protein gains and losses.17 Interestingly, the amount of nitrogen loss, as urea or lack of absorption, with higher protein intakes may also depend on the form of protein ingested. It has been shown that soy protein leads to a greater loss of nitrogen than milk proteins.17 In a study conducted by Morens et al.,17 the net postprandial protein utilization was higher in the milk group (74%) than in the soy group (71%) at habitually normal protein intakes (1 g/kg/day), and this difference became even greater (71% vs. 61%) with habitually high protein intakes (2 g/kg/day).17 Ingestion of habitual high protein diets resulted in a trend toward decreased circulating amino acids when fed the highprotein soy test meal. In fact, soy protein deamination was increased 54% between the normal protein and high protein intake.17 This is critical as the availability of circulating amino acids is, in part, responsible for the rate of muscle protein synthesis, and soy protein may lead to reduced levels of circulating amino acids.17

Your Heart and Nutrition

Your Heart and Nutrition

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