Insulin is released in response to glucose in the blood and is the primary hormone involved in fat storage and weight gain. Insulin is the main anabolic hormone in our body, which means it promotes "building" in the body (e.g. fat storage), rather than breaking things down. Insulin tells our cells to take up glucose from the blood before use or, if there is too much, for storage. Since weight loss generally requires us to burn fat stores, we need to control our insulin so that we signal the body to burn fat, rather than store more of it.
We often associate insulin with diabetes, but it is a major contributor to weight gain for everyone - whether diabetic or not - and must be properly regulated to successfully maintain a healthy weight.
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