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2024
Maturitas
A prospective study of 24,892 Spanish women (639 breast cancer cases) from the EPIC cohort examined associations between three dietary patterns (Western, Prudent, Mediterranean) and breast cancer risk over time. Women with moderate-to-high adherence to the Western dietary pattern showed a non-linear 37% increased breast cancer risk compared to those with lowest adherence (HR = 1.37; 95% CI: 1.07-1.77 for third quartile and HR = 1.37; 95% CI: 1.03-1.83 for fourth quartile), with particularly strong associations in postmenopausal women (HR = 1.42; 95% CI: 1.04-1.94 in highest quartile) and for ER+/PR+/HER2- tumors (HR = 1.71; 95% CI: 1.11-2.63 in highest quartile), while Prudent and Mediterranean patterns showed no clear associations. The findings suggest that Western dietary patterns characterized by high-fat dairy, red and processed meats, refined grains, sweets, caloric drinks, and convenience foods may increase breast cancer risk, especially for hormone receptor-positive tumors in postmenopausal women.
2018
Eur J Obstet Gynecol Repod Biol
A hospital-based case-control study of 134 breast cancer cases and 267 controls in Tehran, Iran used a 168-item food frequency questionnaire and factor analysis to identify two major dietary patterns and assess their association with breast cancer risk. The “healthy” pattern (high in fruits, vegetables, seeds, legumes, fish, whole grains, and liquid/olive oils, with low salt) showed no significant association with breast cancer (OR: 0.83), while the “unhealthy” pattern (high in sweets, soft drinks, mayonnaise, solid oils, processed meat, fried/boiled potatoes, and salt) was associated with significantly increased breast cancer risk in the highest versus lowest quartile (OR: 2.21; 95% CI: 1.04-4.69). When stratified by menopausal status, the unhealthy dietary pattern showed a particularly strong association with breast cancer risk among postmenopausal women (OR: 3.56; 95% CI: 1.16-10.95), but not premenopausal women. These findings suggest that overall dietary patterns—rather than individual nutrients or foods—may be important determinants of breast cancer risk, with an unhealthy Western-style diet pattern characterized by processed foods, added sugars, unhealthy fats, and high salt intake potentially more than doubling breast cancer risk, especially in postmenopausal Iranian women.
2022
PLOS Med
A large French study following nearly 103,000 adults for nearly 8 years found that people who consumed higher amounts of artificial sweeteners—particularly aspartame and acesulfame-K found in diet sodas and many processed foods—had a 13-15% increased risk of cancer overall, with specific increases in breast cancer and obesity-related cancers. The research, which carefully tracked detailed dietary records and controlled for multiple lifestyle factors, showed aspartame was associated with a 22% higher breast cancer risk among higher consumers compared to non-consumers. While the study has some limitations including potential confounding factors, these findings add to growing concerns about artificial sweetener safety and support the need for regulatory agencies to re-evaluate the safety of these widely used food additives found in thousands of products worldwide.