Official Title

Effects of Omega-3 Fatty Acids on Risk Factors for Breast Cancer in Pre-menopausal Women
  • Phase

    Phase 3
  • Study Type

  • Status

    Completed No Results Posted
  • Study Participants

Healthy premenopausal women were enrolled in a diet intervention study that examined the effect of a combination EPA/DHA supplement on risk factors associated with breast cancer. In a randomized cross-over design, women consumed their habitual diet with a supplement for three menstrual cycles, had three cycles of wash-out and then consumed a low-fat diet with the same supplement. Blood, urine and nipple aspirate fluid were collected periodically over the 10 month protocol and analyzed for biomarkers associated with supplementation and future risk of breast cancer.
Non-pregnant, non-lactating women aged 18+ were recruited by way of posters, to take part in a dietary intervention study that was examining the effects of dietary fat level and fat type on risk factors associated with breast cancer. Women who were normally menstruating, consumed either their habitual diet or a low-fat diet for three menstrual cycles, along with a supplement containing 1.2 g DHA+EPA /day. This was followed by a 3-menstrual cycle washout, where the habitual diet was consumed without a supplement. Subsequently the participants consumed the other diet (either low-fat or habitual) for a further 3 menstrual cycles with the 1.2 g DHA/EPA supplement. Blood, urine and nipple aspirate fluid were collected at the beginning and end of each intervention period and analyzed for a variety of biomarkers. Diet records were collected continuously over the entire study period and periodic 7-day records examined for collection of detailed nutrition information. Anthropometry was completed at each study visit, and nutritional counselling provided throughout.
Study Started
Mar 31
Primary Completion
Dec 31
Study Completion
Dec 31
Last Update
Oct 26

Dietary Supplement omega-3 fatty acid

SEE YOURSELF WELLTM OMEGA-3 Dietary Supplement: See Yourself Well Inc., Leamington, Ontario) containinged 200 mg of EPA and 100 mg of DHA for a total of 1.2 g n-3/day.

Habitual supplemented Active Comparator

habitual diet with 1.2 g EPA+DHA in capsule form/day.

Low-fat supplemented Experimental

Reduce dietary fat to less than 20% energy, add 1.2 g EPA+DHA in capsule form/day.


Inclusion Criteria: menstruating, pre-menopausal -

Exclusion Criteria: pregnant, lactating, post-menopausal, smoking, on birth control pills

No Results Posted