If you are currently pregnant, underweight, have Type 1 diabetes, or have a history of disordered eating, this masterclass is not for you. Do not purchase this class and do not practise any form of fasting. These are firm clinical contraindications, not cautions to navigate around. For women who fall outside these categories, this chapter outlines the foundational principles for fasting safely, strategically, and in a way that supports rather than disrupts hormonal health.

The female metabolism moves to its own rhythm, different from the male blueprint. Typical fasting advice may miss the mark or even cause setbacks for women. In this chapter, you will dive into the two main energy systems that power your body during fasting, learn how women naturally shift between burning glucose and fat throughout their cycle, and discover why timing and duration matter more than just reducing calories. You will walk away with the tools to partner with your biology, fueling consistent energy, mental clarity, and lasting health.

To master fasting as a woman, you first need to understand the Infradian Rhythm. This monthly cycle works alongside the circadian clock, guiding hormonal shifts through four distinct phases. In this chapter, you will unravel the roles of estrogen, progesterone, LH, FSH, and cortisol as they ebb and flow. You will see how each phase shapes a unique hormonal landscape, influencing appetite, stress, metabolism, and your capacity to fast.

In this chapter, you will see how female hormones act as conductors, directing how your body uses energy. Estrogen boosts insulin sensitivity and fat burning during the follicular phase, while rising progesterone in the luteal phase shifts fuel use and raises calorie needs. You will learn to align your fasting windows with the phases that support your body, helping you thrive instead of triggering a hormonal stress response.