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  • How long is an effective fast
  • How long does it take for 16/8 intermittent fasting to work

  • How long does it take for 16/8 intermittent fasting to work
  • Intermittent fasting schedule
  • How long should you fast for weight loss
  • What is the best intermittent fasting window to lose belly fat
  • Best intermittent fasting for weight loss
  • How long should you fast for weight loss...

    Registered dietitian

    By Rachael Ajmera, MS, RD

    Registered dietitian

    Rachael Ajmera, MS, RD is a registered dietitian and writer based in San Francisco.

    She holds a master's degree in Clinical Nutrition from New York University and an undergraduate degree in Dietetics.

    Fasting is a practice that dates back thousands of years and is still a staple across many religions and cultures.

    More recently, variations of fasting like intermittent fasting, circadian rhythm fasting, and time-restricted feeding have been studied for their potential health effects, with some research indicating that fasting could even help you live longer1, ward off chronic disease, and rev up weight loss and fat burning.

    In this article, we'll take an in-depth look at the science behind each stage of fasting, along with some expert-backed tips on what to do to maximize each one.

    The four stages of fasting.

    The physical changes that your body goes through during a fast can be divided into four stages:

    • Stage 1: Fed state (0-3 hours)
    • Stage 2: Early fasting state (3-18 hours)
    • Stage

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