Among overweight postmenopausal women, the one-forth eating the lowest glycemic index diet were 26 percent less likely to get breast cancer than the one-forth of women eating the highest glycemic index diet according to a study from France. To say this in reverse, the risk of breast cancer was 35 percent higher in the one-forth of women eating the highest glycemic index diet.

A difference of about 60 pounds increases the risk of breast cancer 1.4-fold in postmenopausal women according to a study from the University of Oxford in Oxford, England. Previous research has found that obesity does not increase the risk of breast cancer prior to menopause, in fact, it protects against it.

Studies of White women have found that being overweight lowers the risk of premenopausal breast cancer, but increases the risk of postmenopausal breast cancer. However, this does not seem to be the case with Black women according to a study from Boston University in Boston, Massachusetts, USA.

Women with type 2 diabetes are at a 20 percent greater risk of breast cancer than women without type 2 diabetes according to an analysis by researchers from Sweden.

Among countries in the European Union, 3.4 percent of all cancers in men and 6.4 percent of all cancer in women are attributable to overweight and obesity according to a paper published in the British Medical Journal.

People who consume the most onions reduce the risk of various cancers by 25-88 percent according to a study from Italy.

Even slightly elevated body mass index (BMI) increases the risk of breast cancer in postmenopausal women according to a new study from the University of Hong Kong.

Elevated fasting blood sugar levels—above 140 mg/dL—increase the risk of cancer death by 29 percent in men and 23 percent in women compared to people with the lowest blood sugar levels—less than 90 mg/dL—according to a study from Korea.

An adult weight gain of 20 pounds doubles a woman’s risk of breast cancer according to the U.S. NIH’s Obesity Guidelines (p. 18).

Gaining more than 33 pounds during pregnancy increases the risk of breast cancer 61 percent compared to women who gain the recommended amount of weight of 24 to 33 pounds according to a new study from Finland.

Previous research found that adult weight gain appears to double the risk of postmenopausal breast cancer. New research finds that adult weight loss reduces the risk of breast cancer after the age of 55 by 50-60 percent.

Fat intake is not associated with breast cancer according to a recent study.

Type II diabetes and chronically elevated levels of insulin are associated with an increased risk of cancers of the colon, breast, pancreas, kidney, and endometrium.

Being overweight or obese may account for 23 percent of female cases of breast cancer in the U.S..

One-third to one-half of postmenopausal breast cancer deaths may be due to excess bodyweight according to a study from the American Cancer Society.

Adult weight gain is more important than body mass index (BMI) at determining the risk of postmenopausal breast cancer according to a study from the American Cancer Society.

Being overweight increases the risk of postmenopausal breast cancer by 30 percent in women, while being obese increases the risk 50 percent.

Avoiding weight gain reduces the risk of developing colon cancer, postmenopausal breast cancer, endometrial cancer, kidney cancer (renal cell carcinoma) and oesophagus cancer (adenocarcinoma).

Being 20-29 percent over ideal weight increases a woman’s risk of dying from breast cancer by 16 percent according to a study done by the American Cancer Society involving 750,000 people determined the risk of dying from individual diseases. 

Being overweight or obese decreases the risk of breast cancer in women prior to menopause according to a new study. Many other studies have reached the same conclusion, however, obesity increases the risk of breast cancer following menopause.

Overweight increases the risk of breast cancer in postmenopausal women, but decreases the risk in premenopausal women according to a number of studies. 

Severe calorie restriction early in life appears to reduce the risk of breast cancer, especially in women who later have children, according to a study from researchers at Harvard University.