Female Puberty Onset: HPG Axis, Genetics, Body Composition, CNS Maturation, and Environment

Key Drivers of Puberty in Girls

• Hypothalamic-Pituitary-Gonadal (HPG) Axis: Hypothalamus releases GnRH → pituitary releases FSH/LH → ovaries produce estrogen/progesterone.
• Genetic Factors: Hormone-related genes influence timing and rate of pubertal development.
• Body Composition and Nutrition: Critical body fat percentage triggers puberty; adequate nutrition supports hormone production.
• Central Nervous System Maturation: Hypothalamus and pituitary maturation essential for initiation/regulation.
• Environmental Factors: Stress, toxins, medications can affect timing and progression.

These factors lead to secondary sexual characteristics: breast development, pubic/axillary hair, body shape changes, menarche. Onset varies widely due to individual genetics, environment, and health.