Puberty When puberty starts and ends
 Obesity is the state of being very overweight. A scientific study seems to say that girls who are obese start puberty early. Some obese girls have started growing breasts before the age of nine years and have had their first period before 12 years. Therefore, if a girl is obese, her body fat sends signals to her brain that she is ready to become pregnant. Girls who have early puberty can have health problems later on in life.