Based on my personal experience with intermittent fasting, I noticed my ability to fast varies significantly throughout my menstrual cycle. During the follicular phase, which starts from menstruation and lasts until ovulation, I feel more energetic and find it easier to fast. This is likely because estrogen levels are higher during this phase, improving insulin sensitivity and making fasting feel more manageable. However, after ovulation, when the luteal phase begins, I experience increased hunger and fatigue. This aligns with the rise in progesterone, which signals the body to intake additional energy—around 150 to 175 extra calories daily. Attempting long fasting periods during this time can feel particularly tough and may affect overall wellbeing. What helped me was adopting a flexible fasting approach that respects these hormonal fluctuations. Shorter fasts or adjusting eating windows to consume nutrient-dense meals during the luteal phase made fasting sustainable and less stressful. Embracing this hormone-aware fasting strategy transformed my experience, allowing me to work with my body's natural rhythms rather than against them. Understanding that these challenges are rooted in biology—not a lack of discipline—provides reassurance. For women over 40 or those approaching perimenopause, hormonal shifts can further influence fasting tolerance, making it even more important to tailor fasting practices accordingly. In summary, syncing fasting schedules with menstrual cycle phases and honoring the body's nutritional needs during the luteal phase supports better hormone health and fasting outcomes. This perspective can empower women to maintain a balanced lifestyle while benefiting from fasting.