Prevention

No lifestyle factors have proven to protect against ovarian cancer, although the following are some study results that suggest some lower or higher risk;

• One study reported that women who consume fish and vegetables had a lower risk for ovarian cancer. In support, another 2001 study suggested foods high in specific chemicals called alpha carotene (e.g. carrots) and lycopene (e.g. tomatoes) may be specifically protective.
• Exercise, which protects against many diseases and even some cancers, appears to have no effect on ovarian cancer. Nevertheless, a 2001 study found a higher risk for ovarian cancer in women who were obese, particularly when they were sedentary. Moderate exercise is a good idea and may offer some protection against breast cancer, in any case.
• Smokers should quit. Although evidence of an association with ovarian cancer is weak, it is always wise to stop smoking.

These and other studies on lifestyle factors are generally not considered to be evidence, although they can suggest directions for future research.

Limiting Ovulation

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In general, factors or behaviors that limit stimulation of the ovaries or inhibit ovulation appear to be protective.

Pregnancy. The more times a woman has been pregnant the less likely she is to develop ovarian cancer. One study indicated that ovarian cancer was reduced by 40% with one pregnancy and by 14% with each subsequent pregnancy.

Breastfeeding. Breastfeeding, even for only one or two months, may also reduce the risk for ovarian cancer by as much as 40%. A longer duration of breastfeeding does not appear to increase its protective benefits.