Leptin is a hormone that balances energy in our body modern diets and lifestyles create a resistance to this hormone. The brain should, with normal Leptin responses, tell us when we need to take on fuel and when we don't. Leptin acts as our "fuel gauge". When that gauge becomes "stuck" our body and our brain no longer react normally, leading to an unstoppable cycle of weight gain. This response has nothing to do with willpower or determination; it's chemical warfare and our body is the enemy
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