Adam Shaw

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Similar to a car alerting you when the fuel is too low, ghrelin plays a signalling role, telling you to eat, so you’re not too low in fuel reserves or energy. Leptin is similar to that click you hear when you fill up the tank, letting you know that you’re full and there’s no need to add more fuel. This is to oversimplify other biological roles of leptin, but we don’t need to go that far down the rabbit hole.
Not a Diet Book: The Must-Have Fitness Book From the World's Favourite Personal Trainer
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