top of page

The Journey Through a 100-Hour Fast: A Guide for Pilates Teachers

Marking Moments: A Fasting Timeline Visualised
Time's Journey: The 100-Hour Fast Unveiled

Fasting has become a topic of much interest in the health and wellness community, promising benefits from weight loss to improved metabolic health. As Pilates teachers, understanding the nuances of such practices can aid in providing holistic guidance to our clients. This blog explores the physiological journey through a 100-hour fast and outlines safety tips for those considering this profound health reset.

The Fasting Timeline: Understanding Your Body's Response

First 16 Hours: The initial phase of a fast is marked by the body utilising its glycogen reserves—glucose stored in the liver and muscles. As glycogen is consumed for energy, it releases water, leading to rapid weight loss primarily from water weight.

Hours 16 to 24: After crossing the 16-hour mark, the body begins to enter ketosis, a metabolic state where fat is converted into ketones. These molecules serve as the primary energy source for both brain and body, improving insulin sensitivity and reducing the risk of type 2 diabetes.

Hours 24 to 48: The first two days see a ramp-up in autophagy, the body's process of purging damaged cells and generating new ones. Despite potential hunger pangs, driven largely by habit, resisting them can diminish the sensation of hunger over time.

Hours 48 to 72: Autophagy intensifies, offering significant cellular cleanup. The body's reliance on ketones for energy increases, enhancing mental clarity and energy levels. Human growth hormone levels also surge, protecting muscle mass and initiating tissue repair.

Hours 72 to 100: Beyond 72 hours, fasting benefits are at their peak. Autophagy continues robustly, systemic inflammation decreases, and the immune system may experience a reset, lowering the risk of chronic diseases. By hour 100, the body has adapted to fat as its primary fuel source, potentially resulting in significant weight loss and a profound sense of achievement.

Ensuring a Safe Fast: Recommendations and Considerations

To ensure a fasting experience is beneficial and not detrimental, it's crucial to approach it with caution and preparation:

  • Stay Hydrated: Water is essential throughout the fasting period. It's recommended to drink plenty of water to support the body's processes and aid in the removal of toxins.

  • Consider Light Beverages: Green tea is allowed and can be beneficial due to its antioxidant properties. Coffee in the morning is also permissible but should be consumed black and in moderation to avoid disrupting the fast's benefits.

  • Monitor Your Health: Those with pre-existing health conditions, pregnant women, or individuals taking medication should consult a healthcare professional before embarking on a fast.

  • Listen to Your Body: Recognising and respecting your body's signals is paramount. If you experience adverse effects, such as dizziness, excessive weakness, or cognitive impairment, it's essential to reconsider continuing the fast.


A 100-hour fast offers a journey of discovery for your body, tapping into ancient mechanisms of healing and rejuvenation. For Pilates teachers and practitioners alike, it's a testament to the power of resilience and the potential for profound health transformation. However, embarking on such a journey requires careful consideration and respect for one's health and limits. By staying informed and mindful, a fast can be a safe and rewarding experience, aligning perfectly with the holistic wellness principles central to Pilates.


bottom of page