Nesfatin-1

Where it comes from

Made in

The paraventricular and arcuate nuclei, the brainstem, and outside the brain the stomach’s ghrelin cells, islets and fat

Sent out by

Fasting lowers its production in brain and stomach and refeeding raises it again; blood levels are less consistent

Acts on

• Hypothalamic feeding circuits
• Brainstem
• Islets (insulin)
• Heart and vessels

What it does

• Reduces food intake and weight when given into the brain, even in leptin-resistant animals ¹
• Raises blood pressure and slows gastric emptying
• Takes part in anxiety and stress responses

In medicine

• No medicine copies it or blocks it. Blood nesfatin-1 is a research marker, and the findings in obesity and diabetes do not agree ²
• Pooled studies show the disagreement plainly: across type 2 diabetes cohorts the direction of the difference varies with the assay and the population, and the same is true in polycystic ovary syndrome ²³

Beyond the body’s own use

• Nothing containing nesfatin-1 is in trials, approved or obtainable outside the laboratory
• What makes it worth following is that it works without leptin: given into the brain of a leptin-resistant animal it still reduces food intake and weight, which no leptin-based approach does ¹
• What is unknown is what it binds. No receptor has been identified in twenty years, its effects are traced through melanocortin and oxytocin circuits instead, and without a receptor there is nothing for a medicine to aim at ¹