Intermittent Fasting for Women: Benefits, Challenges, and Best Practices

Nadia Ali · September 5, 2026

Challenges of Intermittent Fasting for Women

  1. Hormonal Fluctuations While intermittent fasting can have hormonal benefits, it can also disrupt hormones if practiced incorrectly. Extended fasting or too restrictive eating windows may impact menstrual cycles and estrogen levels, particularly in women with lower body fat or those who are under stress. It’s essential to listen to your body and consult with a healthcare professional before starting IF.
  2. Stress and Cortisol Levels Fasting increases the production of cortisol, the body’s stress hormone. While some cortisol release is normal and even beneficial for fat burning and energy, prolonged high cortisol levels can lead to fatigue, anxiety, and a disruption of sleep. Women who have chronic stress or adrenal issues may find IF exacerbates these symptoms.
  3. Nutrient Deficiency If intermittent fasting is not planned properly, there is a risk of nutrient deficiencies. With a smaller eating window, it may be challenging to consume all the essential nutrients needed to support an active lifestyle. This is especially important for women who require specific nutrients like calcium, iron, and folic acid for overall health and optimal athletic performance.
  4. Energy and Performance Fluctuations While many women report feeling energized and focused during fasting periods, others experience energy dips or fatigue. For athletes, this can affect performance during training, particularly if the fasting window coincides with high-intensity workouts. Finding the right timing and balance of fasting and eating is key to maintaining energy levels and avoiding performance dips.