A new manuscript recently published in The Journal of Nutrition investigated the physiological response to various ounce equivalents of protein food sources and found that the consumption of ounce equivalents of animal-based protein food sources resulted in greater gain in whole-body net protein...
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Overall, investigators found that animal-based protein food sources elicited greater anabolic responses than plant-based protein food sources. Whole body protein balance increased more in the beef, pork, and eggs groups than all of the groups consuming plant-based protein food sources. Protein synthesis increased more in the beef group than in the groups consuming plant protein foods, kidney beans, peanut butter, or mixed nuts, while the egg and pork groups suppressed protein breakdown more compared with mixed nuts. The magnitude of the whole-body net balance response was correlated with the essential amino acid content of the protein food source. The researchers concluded that "ounce equivalents" of protein food sources as expressed in the DGAs are not metabolically equivalent in terms of either the anabolic response or caloric value and this should be considered as the DGAs develop approaches to establish healthy eating patterns.
"Our research illustrates that animal-based protein foods, such as beef, eggs and pork, and plant-based protein foods, such as kidney beans, peanut butter, tofu and mixed nuts, cannot be considered to be equivalent, or a substitute for each other, when developing healthy dietary patterns, given their unique physiological effects," said lead researcher Robert Wolfe, PhD, Director, Center for Translational Research in Aging and Longevity, and Professor of Geriatrics, University of Arkansas for Medical Sciences. "While it's well-established that animal proteins can more readily provide essential amino acids than plant protein foods, our study also indicates that eating animal protein foods such as beef, pork and eggs may lead to increased protein synthesis, which has been shown to have benefits such as improved satiety and lean muscle mass maintenance."