Researchers at Harvard Medical School studied the health status of nurses at Brigham and Women’s Hospital to determine the relationship between caffeine intake, smoking, weight, fertility drugs, birth control pills, hormone replacement therapy and the risk of ovarian cancer in women. The researchers conducted the survey by distributing questionnaires over a 28-year period. Questions on each questionnaire included the amount and type of caffeine-containing foods and beverages consumed and whether they smoked, body mass index, fertility history, use of birth control pills, postmenopausal use of hormone replacement therapy and whether there was a family history of the disease. The researchers evaluated the relationship between smoking status and risk of ovarian cancer in 110,454 women, carefully analyzing smoking status, including duration of smoking, number of packs smoked per day, and then analyzing whether these conditions were associated with developing ovarian cancer, and they found that smoking was associated with developing mucinous ovarian cancer. The researchers explored the relationship between caffeine intake and ovarian cancer in 80,253 women. They recorded the amount of caffeine consumed or the amount of tea or cola consumed in a week and found that caffeine intake reduced the likelihood of ovarian cancer in women who had never previously used oral contraceptives or received hormone replacement therapy during menopause. In addition, half of the patients with ovarian cancer were over the age of 63, and the heavier they were, the higher their risk. In addition, some fertility drugs may also trigger the risk. Long-term use of birth control pills may reduce the risk of ovarian cancer, but its effect in combination with hormone replacement therapy, which increases the risk of ovarian cancer, is uncertain. Those studying ovarian cancer have identified additional risk factors, such as a woman’s age and family history. While this cannot be changed, women can reduce the likelihood of developing the disease by making lifestyle changes. Maintaining a healthy weight can reduce the risk of ovarian cancer. Obese people have unreasonable eating habits of high fat and high calorie, but everyone should develop good eating habits whether they are obese or not. Eat more vegetables, fruits and grains, and exercise moderately to reduce the risk of cancer. Drinking caffeinated coffee and tea can reduce the incidence of ovarian cancer. According to new research, women who eat more tomatoes, carrots and other foods rich in lutein and lycopene can reduce their risk of ovarian cancer, and experts recommend that women should eat at least five carrots and two and a half cups of tomato juice a day and not smoke. The results of the study were published in the electronic version of the Journal of Cancer, a journal on the same level as the American Cancer Society.