This review examines how reactive oxygen species (ROS) within the hypothalamus help regulate food intake, energy expenditure, and glucose metabolism. Signals generated by glucose, fat, insulin, leptin, and ghrelin produce transient bursts of ROS that allow specialized neurons to sense the body's energy status and coordinate appropriate metabolic responses. The authors describe ROS as an essential component of the brain's nutrient-sensing system, linking mitochondrial function directly to appetite and whole-body metabolism.

When this signaling system becomes chronically disrupted, however, ROS contribute to oxidative stress, impaired leptin and insulin signaling, inflammation, and metabolic dysfunction. The review argues that obesity and type 2 diabetes involve a breakdown of normal hypothalamic redox signaling, suggesting that restoring healthy mitochondrial function and ROS regulation may be an important strategy for improving metabolic health.

https://www.frontiersin.org/journals/neuroscience/articles/10.3389/fnins.2015.00056/full