A B Hydroxybutyrate Shunt Pathway Generates Antiobesity Ketone Metabolites(1)

Scientists at Stanford University have identified a previously unknown metabolic pathway that may help explain why ketogenic diets and intermittent fasting are effective for weight management. When your body produces ketones - which happens during fasting, exercise, or when following a very low-carb diet - it doesn't just use them for energy. The researchers found that ketones can combine with amino acids (protein building blocks) to create entirely new compounds called BHB-amino acids.

These newly discovered compounds appear to act as natural appetite suppressants. When the research team studied these BHB-amino acid compounds in both mice and humans, they found them circulating naturally in the bloodstream. Most importantly, when they gave one specific compound (BHB-Phe) to obese mice, the animals ate less food and lost weight. The compound seemed to work by activating specific regions in the brain that control feeding behavior.

This discovery helps explain why people often experience reduced hunger when following ketogenic diets or during periods of fasting. Rather than ketones simply serving as an alternative fuel source, they're actively creating metabolites that signal the body to eat less. The research suggests that this "ketone shunt pathway" represents an evolutionary mechanism that helps regulate energy balance during times when carbohydrate availability is low.

For clinical practice, this research provides new insights into the biological mechanisms behind popular metabolic interventions. Understanding how ketones naturally suppress appetite could lead to more targeted approaches for weight management and may help clinicians better counsel patients on the timing and implementation of ketogenic diets or intermittent fasting protocols.