Clinical Nutritionist Practice Test 2025 - Free Practice Questions and Study Guide

Ketogenesis is the metabolic process in which the body produces ketones from fatty acids. This process typically occurs when carbohydrate intake is low, such as during fasting, prolonged exercise, or a ketogenic diet. In these conditions, the body needs an alternative energy source, as glucose levels may be insufficient.

During ketogenesis, fatty acids are released from adipose tissue and transported to the liver, where they are converted into ketone bodies. These ketones, including acetoacetate, beta-hydroxybutyrate, and acetone, can then be used by various tissues, including the brain, as a fuel source. This adaptation allows the body to efficiently utilize fat for energy, especially during periods of low carbohydrate availability.

The other options refer to different metabolic pathways: converting carbohydrates into glucose pertains to gluconeogenesis; glycogen formation from sugars relates to glycogenesis; and the breakdown of proteins into amino acids involves proteolysis. Understanding these distinct metabolic processes helps clarify the specific role of ketogenesis in energy metabolism.