• Lisa Van Dyck and Michaël P Casaer.
• Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium.
• Curr Opin Crit Care. 2019 Aug 1; 25 (4): 356-362.

Purpose Of ReviewTo balance theoretical pros and cons of intermittent feeding, in light of the current nutritional management early during critical illness.Recent FindingsLess aggressive nutrient administration is clinically superior in acute critical illness. This counterintuitive clinical finding may be explained by nutrient restriction activating autophagy, a process that clears intracellular damage. Intermittent feeding holds numerous theoretical benefits, such as activation of autophagy, preservation of the circadian rhythm, increased protein synthesis, and enhanced endogenous fatty acids release. RCTs investigating intermittent feeding in the ICU, however, are the most often limited to evaluation of gastrointestinal complications. Current guidelines advocate against the use of intermittent feeding, based on lack of benefit and increased risk of diarrhea, as revealed by a meta-analysis.SummaryBenefits of intermittent feeding in the ICU are today speculative, yet its potential impact may reach far beyond the gastrointestinal tract. Only adequately powered RCTs, evaluating both gastrointestinal tolerance, metabolic impact and patient-centered effects of intermittent feeding will allow to adopt or abort this nutritional strategy.

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