Does the acute consumption of water or a protein shake affect body composition measures via the InBody270?
Lia Jiannine, Journal of the International Society of Sports Nutrition 30 November 2020 A20
Background
The purpose of this study was to examine the effects of consuming either 0.6 liters of water or an isovolumic protein shake (160 kcal, 3 g fat, 4 g carbohydrate, 30 g protein) on indices of body composition.
Methods
Forty-two recreationally active men (n=13) and women (n=29) (mean±SD: 168±10 cm, 22±5 yr, 69.8±11.2 kg) consumed 0.6 liters of water or a protein shake (160 kcal, 3 g fat, 4 g carbohydrate, 30 g protein) in a randomized, counterbalanced fashion. Body composition was assessed via multi-frequency bioelectrical impedance (InBody 270) at baseline, immediately post-consumption (0 minutes), 30 minutes post-consumption, and 60 minutes post-consumption.
Results
There were no significant differences between baseline and any time point for the water and protein condition for body mass, lean body mass, and fat mass. Under the protein treatment, there were no significant differences between baseline or any time point for total body water; however, significant differences were found under the water condition (time point 0 and 60 minutes were significantly lower versus baseline). Under both the water and protein conditions, percent body fat was significantly greater (p<0.0001) at time points 0, 30 and 60 minutes compared to baseline (Table 1 and 2).
Conclusions
The acute consumption of either water or an isovolumic protein shake resulted in a measurable increase in percent body fat immediately post-consumption as well as 30 and 60 minutes thereafter.