Brenda Khan
Diet is one of the most important modifiable risk factors for breast cancer. Studies have shown that 29-50% of breast cancer cases could be prevented by adopting a healthy lifestyle, including eating a balanced diet. Nutritional risk factors such as the consumption of dietary fat, meat, fibre, and alcohol have a variety of associations with breast cancer risk. For example, a pro-inflammatory diet and a diet high in refined carbohydrates may increase the risk of breast cancer, while a diet rich in foods like leafy greens, citrus fruits, and fatty fish may help reduce the risk.
| Characteristics | Values |
|---|---|
| Dietary fat | Consumption of meat is associated with heterocyclic amine (HCA) exposure. The type of fat consumed has different effects on the risk of breast cancer. |
| Meat | Consumption of meat is associated with an increased risk of breast cancer. |
| Plant fiber | The protective effect of dietary fiber on breast cancer risk is currently inconclusive. However, a high-fiber diet is associated with a reduced risk of breast cancer. |
| Alcohol | Alcohol consumption may increase the risk of breast cancer by producing acetaldehyde and reactive oxygen species (ROS). |
| Phytoestrogen | Intake of phytoestrogen may reduce the risk of breast cancer. |
| Vitamin D | Vitamin D can reduce the risk of breast cancer by inhibiting the process of cancer invasion and metastasis. |
| Iron | Intake of dietary iron may lead to oxidative stress, DNA damage, and lipid peroxidation. |
| Folate | A lower intake of folate may be linked to a higher risk of breast cancer. |
| Inflammation | A pro-inflammatory diet has been shown to increase the risk of breast cancer, especially in postmenopausal women. |
| Obesity | Obesity is a well-established risk factor for breast cancer, and dietary habits can contribute to this. |
| Carbohydrates | Eating more high-quality carbohydrates, such as whole grains, is associated with a decreased risk of developing breast cancer. |
| Refined carbs | Diets high in refined carbs may increase the risk of breast cancer. |
| Soy | Research on the link between soy intake and breast cancer risk is mixed, but some studies suggest that soy foods may lower the risk. |
| Mediterranean diet | The Mediterranean diet has been associated with a reduced risk of breast cancer. |
| Plant-based diet | Following a mostly plant-based diet may have a protective effect, especially among post-menopausal women. |
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What You'll Learn
Obesity and inflammation
Obesity is associated with an increased risk of breast cancer, particularly estrogen receptor-positive breast cancer in postmenopausal women. This link is mediated through inflammatory pathways and dysregulated metabolism. Obesity causes both in-breast and systemic inflammation, which contribute to the development and progression of breast cancer. Inflammation is a common factor in the pathophysiology of several obesity-related health risks, and obesity-associated inflammation may be a key factor in the development of breast cancer.
Obesity leads to low-grade chronic inflammation that affects multiple organs in the body, including white adipose tissue, liver, intestines, pancreas, muscle, and nervous system. Inflamed white adipose tissue within the breast is associated with elevated levels of pro-inflammatory mediators, enhanced expression of aromatase (the rate-limiting enzyme for estrogen biosynthesis), and increased estrogen receptor-α (ER-α)-dependent gene expression. This provides a potential mechanistic link between obesity and breast cancer, as these pro-inflammatory mediators are known to promote tumorigenesis and growth.
The link between obesity and breast cancer is further supported by the observation that obesity is associated with an increased risk of ER-negative breast cancers, indicating the involvement of estrogen-independent pathways. Additionally, obesity-related effects promote cell proliferation and survival, such as hyperinsulinemia and increased insulin-like growth factor-1 (IGF-1) signaling, as well as altered levels of adipokines, adiponectin, and leptin. Resistin and visfatin, two adipokines elevated in obese adipose tissue, have been positively correlated with breast cancer risk, poor prognosis, and tumor size.
The dietary inflammatory index (DII) provides a tool to evaluate diets on a continuum from maximally anti-inflammatory to maximally pro-inflammatory. Studies have shown that women who consumed diets characterized by a high inflammatory potential, as indicated by higher DII scores, had an increased risk of breast cancer compared to those who consumed more anti-inflammatory diets. This effect was particularly strong among postmenopausal women. Additionally, an adolescent dietary pattern associated with inflammation, characterized by a high intake of sugar-sweetened and diet soft drinks, refined grains, red and processed meats, and margarine, and a low intake of green leafy vegetables, cruciferous vegetables, and coffee, might increase the incidence of pre-menopausal breast cancer.
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Meat consumption
Several studies have examined the association between meat consumption and breast cancer risk, with varying results. Some studies suggest that eating a lot of meat may increase the risk of breast cancer, while others have found no link between the two. The impact of meat consumption on breast cancer risk may be influenced by various factors, including cooking practices, estimated carcinogen levels, and the type of meat consumed.
One study, the Sister Study, found an association between increasing consumption of red meat and an increased risk of invasive breast cancer. In contrast, increasing consumption of poultry was associated with a decreased risk. The study also suggested that substituting poultry for red meat could reduce the risk of invasive breast cancer. However, no association was found between cooking practices, estimated heterocyclic amines, or heme iron from red meat consumption and breast cancer risk.
Another study, the UK Biobank cohort study and meta-analysis, examined the consumption of red and processed meat and breast cancer risk. The European Prospective Investigation into Cancer and Nutrition (EPIC) cohort study also looked at the consumption of meat, eggs, and dairy products in relation to breast cancer risk.
The mechanism proposed to explain the potential association between meat consumption and breast cancer risk involves the metabolic activation of heterocyclic amines (HCAs) and their impact on DNA. HCAs are formed during the cooking of meat at high temperatures, and they can induce genetic mutations that lead to mammary gland carcinogenesis.
While the exact cause-and-effect relationship between meat consumption and breast cancer risk remains unclear, individuals with an increased risk of breast cancer or a family history of the disease may consider reducing their red meat intake or replacing it with poultry.
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Alcohol consumption
The link between alcohol consumption and breast cancer was first described in two landmark reports published in 1987 in the New England Journal of Medicine. These preliminary studies found that even modest drinking was associated with an increased risk of breast cancer. More recent studies have since confirmed this association, with a meta-analysis of 53 studies reporting a 32% increase in the relative risk of breast cancer for women consuming 35-44 g/day of alcohol (approximately 3-4 drinks per day), and a 46% increase in risk for those consuming ≥45 g/day (approximately more than 4 drinks per day). Overall, the relative risk of breast cancer increases by 7% for each additional 10 grams of alcohol consumed per day.
The risk of breast cancer from alcohol consumption is not dependent on the type, quality, or price of the alcohol. Studies have shown that the more alcohol women drink, the higher their risk. Women who consume one drink per day have a 7-10% increase in risk compared to non-drinkers, while those who have 2-3 drinks per day have about a 20% higher risk. Even light drinking (one or fewer drinks per day) has been associated with a 5% increase in risk compared to non-drinkers.
The exact mechanism by which alcohol increases the risk of breast cancer is not fully understood, but it is thought that alcohol may increase the risk by producing acetaldehyde and reactive oxygen species (ROS). Additionally, as alcohol is associated with a higher caloric intake, it may also increase the risk of breast cancer indirectly by contributing to obesity, which is another risk factor for breast cancer.
Given the link between alcohol consumption and breast cancer, it is recommended that adults drink in moderation (one or fewer drinks per day for women, two or fewer drinks per day for men) or abstain from drinking altogether. Reducing alcohol consumption can greatly reduce the risks associated with breast cancer.
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Plant-based diets
Some studies have found that a higher intake of plant-based products and a lower intake of animal foods is associated with a lower risk of cancer, but not specifically breast cancer. For example, the NutriNet-Santé study found that higher intakes of plant-based products and lower intakes of animal foods were associated with a lower overall cancer risk, but no association was found for breast cancer. Similarly, the SUN project found that a moderate adherence to a provegetarian dietary pattern was associated with a decreased risk of breast cancer, but no further associations were found when distinguishing between healthful and unhealthful provegetarian food patterns.
Other studies have found that a plant-based diet can improve health markers in overweight women with metastatic breast cancer. Research published in 2024 found that after eight weeks on a whole food, plant-based diet, women in the intervention group experienced health benefits such as reduced fasting insulin, reduced insulin resistance, reduced total and LDL cholesterol, an improved hormonal profile, and weight loss. Previous research has also found that diets high in plant-based foods, especially fruit, vegetables, and soy, are associated with a lower risk of dying from cancer. Soy has been found to be protective against developing breast cancer, particularly when consumed during adolescence, as phytoestrogens may affect the developing breast tissue during puberty, resulting in a reduced risk of breast cancer later in life.
In terms of dietary patterns, an adolescent dietary pattern associated with inflammation, characterized by a high intake of sugar-sweetened and diet soft drinks, refined grains, red and processed meats, and margarine, and a low intake of green leafy vegetables, cruciferous vegetables, and coffee, might increase the incidence of pre-menopausal breast cancer. On the other hand, a healthy dietary pattern, characterized by fruit, vegetables, lean meat, fish, and unprocessed grains, has been supported by epidemiologic evidence as beneficial for reducing the risk of breast cancer, particularly estrogen receptor (ER)-and/or progesterone receptor (PR)-positive tumors.
Overall, while plant-based diets have been associated with a lower risk of various diseases, the specific association with breast cancer risk remains inconclusive, with some studies finding no association or mixed results.
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Vitamins and compounds
Diet is considered one of the most important and most modifiable factors affecting breast cancer risk and mortality. Nutritional factors have a variety of associations with breast cancer risk. For instance, the type of fat consumed has different effects on the risk of breast cancer. While the intake of alpha-linolenic acid (ALA) from fruit and vegetable oils is associated with a reduced risk of breast cancer, the intake of ALA from nut mixes and processed foods is positively related to risk. Similarly, PUFA from fish such as eicosapentaenoic (EPA) and docosahexaenoic acids (DHA) are inversely associated with risk.
The association between meat consumption and breast cancer risk is explained by the metabolic activation of heterocyclic amines (HCAs) involving the cytochrome P450-mediated N-hydroxylation in the liver and the transportation of HCA metabolites to the breast, where they can induce genetic mutations resulting in mammary gland carcinogenesis. Alcohol consumption may also increase the risk of breast cancer by producing acetaldehyde and reactive oxygen species (ROS).
On the other hand, the intake of phytoestrogen may reduce the risk of breast cancer through genomic and non-genomic action. Vitamin D can also reduce the risk of breast cancer by inhibiting the process of cancer invasion and metastasis. However, the association between vitamin D levels and breast cancer risk is still controversial, with some studies suggesting the need to avoid both deficient and excessive levels. While several studies have shown that many women at high risk for breast cancer have deficient vitamin D levels, others have found higher levels of VitD2 in benign breast tumors and breast cancer compared to healthy controls.
Regarding other vitamins, higher blood levels of magnesium have been linked to a higher risk of developing breast cancer, although previous research on this link is scarce and inconclusive. Some studies suggest that magnesium may have a protective effect in the early phases of cancer development but may promote tumor growth in later stages. Folate levels have also been implicated, with lower intake linked to a higher risk of breast cancer. However, a recent meta-analysis found no association between folate levels and reduced breast cancer risk.
Overall, while the role of vitamins and compounds in breast cancer prevention is still being elucidated, current research suggests that nutritional factors play a significant role in influencing breast cancer risk.
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Frequently asked questions
Diet is one of the most important modifiable risk factors for breast cancer. A healthy diet can reduce your risk of developing breast cancer and improve your overall health. Eating a balanced diet with whole grains, leafy greens, citrus fruits, fatty fish, and fibre can help reduce your risk of breast cancer.
A diet high in refined carbohydrates, sugar, alcohol, highly processed meats, and red meat is associated with an increased risk of breast cancer. The type of fat consumed also has an impact—for example, the intake of myristoleic, erucic, and palmitic acids is associated with a higher risk of breast cancer.
A mostly plant-based diet, such as the Mediterranean diet, may have a protective effect against breast cancer, especially in post-menopausal women. Eating more fibre and high-quality carbohydrates can also help prevent breast cancer. Additionally, walnuts, peanuts, and almonds may help protect against breast cancer, according to some research.
