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How do leptin and insulin help regulate appetite and body weight?
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obesity
The excessive accumulation of body fat can cause serious medical conditions.
Leptin and insulin are critical hormones that help regulate body weight and appetite by acting on the hypothalamus, the region of the brain responsible for controlling hunger.12
- Leptin: Secreted by adipose (fat) cells, leptin acts as an appetite suppressant. When it binds to leptin receptors in the hypothalamus, it triggers chemical signals that promote satiety and reduce hunger. It also plays a role in burning fat stored in adipose tissue. Deficiencies in leptin signaling can lead to persistent hunger, overeating, and obesity.231
- Insulin: Primarily known for regulating blood glucose levels, insulin also functions as an appetite suppressant. It is secreted by the pancreas in response to rising blood sugar, such as after a meal. By facilitating the uptake and storage of nutrients in adipose tissue, muscle, and the liver, insulin helps manage energy balance.24
Together, these hormones provide the brain with feedback regarding the body's energy status, helping to maintain weight stability.124