Whole grains

Suggested

2 studies · 1 recommendation

Last updated: February 25, 2026

Suggested2 studies

Whole grain consumption linked to meaningful reductions in breast cancer risk

Two cohort studies encompassing over 70,000 women associate whole grain intake with lower breast cancer risk. In a Swedish cohort of ~60,000 women, those with high whole grain and vegetable consumption had substantially lower breast cancer rates, while women with low whole grain intake faced a 60% increased risk from dietary cadmium exposure. A Spanish prospective cohort of 10,930 women found that high adherence to cancer prevention dietary patterns—including whole grain consumption—yielded a 73% reduction in post-menopausal breast cancer risk (HR 0.27, 95% CI: 0.08–0.93). While the Spanish study measured a composite dietary score rather than whole grains in isolation, both studies consistently position whole grain intake as a component of dietary patterns protective against breast cancer, particularly post-menopausal disease.

Evidence

Adherence to the 2018 World Cancer Research Fund/American Institute for Cancer Research Recommendations and Breast Cancer in the SUN Project

Authors: Barrios Rodríguez, Rocío, Jiménez Moleón, José Juan

Published: July 13, 2020

In the SUN prospective cohort of 10,930 Spanish female university graduates initially free of breast cancer, an 8-item compliance score was constructed based on 2018 WCRF/AICR cancer prevention recommendations, including consumption of wholegrains, vegetables, fruit, and beans. Women scoring >5 points (higher adherence) versus ≤3 points had a hazard ratio of 0.27 (95% CI: 0.08-0.93) for post-menopausal breast cancer after multivariable adjustment, representing a 73% risk reduction. The overall breast cancer association was inverse but non-significant. The protective effect was attributable to the combined effects of all nutritional and lifestyle components rather than any single factor.

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Dietary cadmium exposure and the risk of hormone-related cancers

Authors: Julin, Bettina

Published: April 27, 2012

In the Swedish women's cohort (~60,000 participants), diets high in cadmium but also high in whole grain and vegetables showed substantially lower breast cancer risk than diets high in cadmium alone. The greatest risk (60% increase) was observed in women with high cadmium and low whole grain and vegetable consumption, compared to women with low cadmium and high whole grain and vegetable intake. This contrast suggests that whole grains and vegetables may provide a protective counterbalance to dietary cadmium exposure in the context of hormone-related cancer development.

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