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Leptin

Written by the Fiveable Content Team โ€ข Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examโ€ขWritten by the Fiveable Content Team โ€ข Last updated September 2025

Definition

Leptin is a hormone produced by fat cells that signals the hypothalamus in the brain about our body fat level. When working properly, leptin helps maintain our body weight within a healthy range.