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A moderate-fat diet containing soy protein does not differentially impact energy balance in male and female mice compared to dairy protein.
Nutrition Research 2023 March 18
Dairy and nondairy plant-based alternative proteins are reported to differentially influence body weight; however, most research has compared plant-based alternatives with isolated dairy proteins rather than a complete milk protein (containing casein and whey). This is notable given that people do not generally consume isolated dairy proteins. Therefore, the present study aimed to investigate the impact of a soy protein isolate (SPI) on factors influencing body weight gain in male and female mice in comparison to skim milk powder (SMP). Based on current knowledge in rodents, we hypothesized that SPI would promote body weight gain compared with SMP. Mice (n = 8 per sex per diet) consumed a moderate-fat diet (35% kcal from fat) containing either SPI or SMP for 8 weeks. Body weight and food intake were measured weekly. Energy expenditure, physical activity, and substrate use were measured using metabolic cages. Fecal energy content was measured with bomb calorimetry. Body weight gain and food intake during the 8-week feeding study was not different in mice consuming either SPI or SMP; however, males had a higher body weight, adiposity, and feed efficiency compared with females (all P < .05). Fecal energy content was approximately 7% higher in both male and female mice fed the SPI diet compared with the SMP diet. Neither protein source affected substrate utilization, physical activity, or energy expenditure. Physical activity in the dark phase trended higher in females compared with males (P = .0732). The present study suggests that the consumption of SPI in the context of a moderate-fat diet has little impact on numerous factors influencing body weight regulation in male and female mice compared with a complete milk protein.
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