Well: Diet High in Saturated Fats May Be Linked to Dense Breasts

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Teenage girls who eat a diet high in saturated fat are at increased risk of developing dense breasts, a study concludes. Dense breasts contain more fibrous and connective tissue than normal and are a risk factor for breast cancer.

Researchers studied 177 girls, ages 10 to 18 at the start of the study, who periodically filled out dietary recall questionnaires. The scientists measured breast density by M.R.I. when the members of the group were 25 to 29 years old. The study is in Cancer Epidemiology, Biomarkers & Prevention.

Average dense breast volume in those in the lowest quarter for saturated fat intake was 16.4 percent, compared with 21.5 percent for those in the highest quarter.

Consumption of unsaturated fats had the opposite associations — the higher the consumption of unsaturated fats, the lower the average dense breast volume.

“We looked only at the associations of breast density with fat intake,” said the senior author, Joanne F. Dorgan, an epidemiologist at the University of Maryland School of Medicine. “Whether this will then be related to an increase in breast cancer later in life, we don’t know. But breast density itself is associated with increased risk.”

The authors controlled for many health factors, but they acknowledge that unknown variables could have affected their results.

“This is all observational data,” Dr. Dorgan said, “and needs to be confirmed before we can make health recommendations.”

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