Consuming protein supplements with meals may promotes weight control than consuming supplements between meals in adults following a resistance training regimen. Intake of dietary protein proximate to resistance-type exercise sessions promotes a positive net protein balance during post-exercise recovery. Protein supplements are available in ready-to-drink, powdered, and solid form and are available for weight management.
Protein supplements designed to augment weight gain or support weight stability are promoted for consumption between meals. Protein supplements either with meals or as meal replacements are often recommended for ingestion to promote weight loss. Consuming protein supplements between meals may decrease compensatory eating behaviors, thereby increasing energy intakes and body weight.
The timing of protein supplementation may be of particular importance, depending on the desired body weight and body composition outcome. The impact of timing the consumption of protein supplements relative to meals has not been evaluated. The researchers investigated whether the existing research studies support consuming protein supplements between meals, or with meals.
Researchers assessed 34 randomized controlled trials with 59 intervention groups. Of the intervention groups designated as consuming protein supplements with meals versus meals, 56% versus 72% increased their body mass, 94% versus 90% increased their lean mass, 87% versus 59% reduced their fat mass, and 100% versus 84% increased the ratio of lean to fat mass over time, respectively.
Meal ingestion of protein was defined as consumption of a dietary protein-rich supplement immediately after a meal, with a meal, or as a high-protein meal replacement. Between-meal ingestion of protein was defined as consumption of a dietary protein supplement predominantly either very near a workout or during another non mealtime. The results from this systematic review provide novel information for people who choose to consume protein supplements as part of their dietary pattern to promote body mass gain or improve body composition through fat mass reduction.
Consuming protein supplements with meals, rather than between meals, may be a more effective dietary strategy to improve resistance training-induced changes in body composition by reducing fat mass, which may be relevant for adults looking to improve their health status. Consuming protein supplements between meals may be more effective at increasing overall body mass.
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