Menstrual Cycle Disruption
Women can experience rapid hormonal changes within just five to seven days of significant alterations in energy availability, particularly when engaging in extreme dieting and excessive exercise. While body fat plays a role, it's the energy intake that primarily influences menstrual health. A woman with a low body fat percentage can maintain her cycle if her energy intake is adequate, highlighting the importance of balanced nutrition in achieving desired aesthetic outcomes.In this clip
From this podcast

Dynamic Dialogue with Danny Matranga
How your Cycle and Birth Control effect Gains/Fat-Loss with Lyle Mcdonald
Related Questions
Can a woman lose her period from training too much or eating too little, and what are the negative implications of losing it?
Can a woman lose her period from training too much or eating too little? What are the negative implications of losing it?
How does the loss of the menstrual cycle affect women's health?