Among 242 Colombian girls followed for 30 months, 57 percent of those deficient in vitamin D had reached menarche, against 23 percent of girls with sufficient levels. Deficient girls started about 0.8 years earlier and were twice as likely to have menarche early after adjustment.
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Early menarche linked to higher risk of breast cancer
A case-control study of 115 breast cancer patients and 230 matched controls in northern Tanzania found later menarche linked to 26 percent lower risk in premenopausal women, while a high BMI at age 20 was linked to 31 percent higher risk. Longer lactation also tracked lower risk.
Lifestyle
Early menstruation linked to higher heart disease risk
British researchers report that women who began menstruating before age 12 faced a 23 percent higher risk of heart disease, a 28 percent higher risk of dying from heart attack or stroke, and a 25 percent higher risk of dying from cancer.
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