Sugary drinks and soda

• According to a study, girls who drank more sugary drinks on a daily basis started their period several months earlier than those who did not. Sugar overload from sodas and sweetened juices can cause changes to your metabolism, which can potentially change a girl’s menarche age, not to mention weight gain.

  Obesity

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  Obesity plagues America’s children, causing many young girls to go through puberty earlier. According to the Centers of Disease Control and Prevention, child obesity has more than tripled since the 70s in the United States. Obesity in young girls could cause them to start their period earlier.

• Starting Your Period Early

  

  Women who receive their period at 11 or younger are 80 percent more likely to experience early menopause. An early period could hint at poor reproductive health, though the exact causes have not been discovered. However, the studies done have proven a link between early menstruation and early menopause.

  Not Having Children (by choice or infertility)

Women with early menstruation are more likely to have premature menopause, but they are in double trouble if they have not had children yet.

• Women are twice as likely to experience premature menopause if they have not had children when compared to women who have had one or more children. The study didn’t clearly outline the correlation, but ovarian problems could be the reason why these premenopausal women have remained childless.
  

   Smoking

  

  According to a study, 14 percent of smoking women were at a greater risk of infertility and 26 percent of going through early menopause.

• Toxins in tobacco smoke can interfere with hormone production causing damage to egg cell production, fertility cycles and preventing an embryo’s ability to implant on the uterine wall
  

  Cancer

• Cancer treatments traditionally damage the ovaries. After receiving chemotherapy and radiation therapy, it is possible – over time – to have some ovarian functions return. But the radiation is so harsh on the body, it usually causes ovary functions to begin to shut down.