NDLE Board Nutritional Biochemistry And Clinical Dietetics Exam 1 Practice

In parenteral nutrition, energy is provided mainly by carbohydrates because they’re readily metabolized to meet daily energy needs. A glucose (dextrose) solution is the most common base energy source in PN formulations, delivering quick, controllable calories and allowing other components—like amino acids for protein synthesis and lipids for additional energy and essential fatty acids—to be added as needed. Lipids do contribute substantial energy and essential fatty acids, but they are usually given as a separate emulsion to round out energy intake, not as the primary energy source. Amino acids supply nitrogen and building blocks for tissues, with energy contribution being secondary. Therefore, glucose solution is the typical energy-providing component in parenteral nutrition.