Fasting has many proven health benefits that include weight loss, increased insulin sensitivity, and it saves time. It also was shown to increase human growth hormone production in the body. That’s because insulin is an antagonist to human growth hormone, so when you go to bed fasted, your body releases human growth hormone to help repair and grow. If you go to bed after eating, the insulin production will suppress the human growth hormone. So you just have to time those according to your daily rythum.

If you are curious to learn more, research Intermediate Fasting.

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Fasting while in Ketosis enhances your body’s ability to use fat as energy while preserving muscle tissue and it’s the kind of fasting I practice.

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Make sure you are drinking water with salt and other essential minerals while you fast.

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I also do not recommend restricting your calories or eating less than you need. So when you break your fast, eat as much as your body desires and insure you provide it with its nutritional needs.

Good question, I hope it helps.