What is the typical energy intake when indirect calorimetry is not available?

• A. 40-45 kcal/kg/day
• B. 65-70 kcal/kg/day
• C. 55-60 kcal/kg/day
• D. 75-80 kcal/kg/day

Answer: (C)

When indirect calorimetry isn’t available, clinicians rely on a weight-based energy target to guide nutrition support, aiming to cover the elevated energy needs that come with illness and stress. The 55-60 kcal/kg/day range is a commonly used starting goal because it accounts for these metabolic demands without assuming too little energy, which can lead to loss of lean mass and poor recovery. For a typical 70 kg adult, that translates to roughly 3,850-4,200 kcal per day, delivered as a balanced mix of carbohydrates, protein, and fats with ongoing monitoring. Starting around this level helps ensure adequate energy delivery while avoiding the risks of underfeeding; if the patient is metabolically less active, you may reduce later, and if they’re more hypermetabolic, you can adjust upward as clinical data support it. Lower estimates around 40-45 kcal/kg/day risk underfeeding and prolonged catabolism, while higher ranges like 65-70 or 75-80 kcal/kg/day increase the chance of overfeeding and associated complications.