Foods To Avoid When Taking Anastrozole: Stay Away From These Foods!

By Hayden Vanderwaal

Updated On

Anastrozole is a crucial medication used in the treatment of breast cancer in postmenopausal women. As a type of hormone therapy, anastrozole works by reducing the production of estrogen in the body, which can help slow down or stop the growth of breast cancer cells. While taking anastrozole, it’s essential to pay attention to your diet, as certain foods can impact the effectiveness of the medication. In this blog post, we’ll explore the foods to avoid and eat while taking anastrozole to maximize the benefits of your treatment.

Key Takeaways

  1. Anastrozole is a medication that treats breast cancer by reducing estrogen production in the body.
  2. Certain foods high in estrogen or that interfere with anastrozole should be avoided during treatment.
  3. Eating a balanced diet rich in fruits, vegetables, whole grains, and lean proteins can support treatment effectiveness.

What is anastrozole?

Anastrozole is a prescription medication used to treat breast cancer in postmenopausal women. It belongs to a class of drugs called aromatase inhibitors, which work by reducing the amount of estrogen produced in the body. By lowering estrogen levels, anastrozole can help prevent the growth and spread of breast cancer cells that rely on estrogen to thrive.

Also Read: Foods To Avoid If Alkaline Phosphatase Is High?

How does anastrozole work?

Anastrozole works by inhibiting the enzyme aromatase, which is responsible for converting androgens (male hormones) into estrogen. By blocking this enzyme, anastrozole effectively reduces the amount of estrogen available in the body. This is particularly important for postmenopausal women with hormone receptor-positive breast cancer, as the growth of these cancer cells is fueled by estrogen.

How to take anastrozole safely and effectively?

To ensure the best possible treatment outcome, it’s crucial to take anastrozole exactly as prescribed by your healthcare provider. Typically, the recommended dose is one tablet taken once a day, with or without food. It’s important to take the medication at the same time each day and not miss any doses. If you accidentally forget a dose, take it as soon as you remember, unless it’s almost time for your next scheduled dose. In that case, skip the missed dose and continue with your regular dosing schedule.

Foods to avoid when taking anastrozole

While undergoing treatment with anastrozole, it’s essential to be mindful of your diet and avoid certain foods that can interfere with the medication’s effectiveness or increase estrogen levels in the body. Some foods to avoid include:

  • Soy products: Soy contains phytoestrogens, which are plant-based compounds that mimic the effects of estrogen in the body. Consuming large amounts of soy products, such as tofu, soy milk, and edamame, may counteract the effects of anastrozole.
  • Flaxseeds: Like soy, flaxseeds are rich in phytoestrogens and should be avoided or consumed in moderation while taking anastrozole.
  • Alcohol: Drinking alcohol can increase estrogen levels in the body, which may reduce the effectiveness of anastrozole. It’s best to limit or avoid alcohol consumption during treatment.
  • High-fat foods: A diet high in saturated and trans fats can lead to weight gain and inflammation, which may negatively impact treatment outcomes. Limit your intake of fried foods, processed snacks, and fatty meats.

Foods to eat while taking anastrozole

To support the effectiveness of anastrozole and promote overall health during treatment, focus on eating a balanced diet rich in the following foods:

  • Fruits and vegetables: Incorporate a variety of colorful fruits and vegetables into your diet, as they are packed with essential vitamins, minerals, and antioxidants that can support immune function and overall health.
  • Whole grains: Choose whole grain options like brown rice, quinoa, and whole wheat bread to provide your body with fiber, B vitamins, and other important nutrients.
  • Lean proteins: Include lean protein sources such as chicken, fish, turkey, and legumes in your diet to support muscle mass and immune function.
  • Healthy fats: Incorporate healthy fats from sources like avocados, nuts, seeds, and olive oil to support heart health and reduce inflammation.

Remember to stay hydrated by drinking plenty of water throughout the day, as this can help manage side effects and support overall well-being during treatment.


Anastrozole is an important medication in the treatment of breast cancer, and paying attention to your diet can help maximize its effectiveness. By avoiding foods high in estrogen or those that may interfere with the medication, and focusing on a balanced diet rich in fruits, vegetables, whole grains, and lean proteins, you can support your treatment and overall health. Always consult with your healthcare provider or a registered dietitian for personalized dietary advice tailored to your specific needs during treatment.

Read More: Foods To Avoid While Taking Glimepiride: The Complete Guide


Q: Can I consume small amounts of soy while taking anastrozole?

A: While it’s best to avoid or limit soy products, consuming small amounts occasionally may be acceptable. Consult your healthcare provider for specific guidance.

Q: Are there any supplements I should avoid while taking anastrozole?

A: Some supplements, such as red clover and black cohosh, contain phytoestrogens and may interfere with anastrozole. Always discuss any supplements with your healthcare provider before taking them.

Q: Can I drink green tea while taking anastrozole?

A: Green tea contains small amounts of phytoestrogens, but moderate consumption (1-2 cups per day) is generally considered safe. However, it’s always best to consult your healthcare provider.

Q: Should I avoid all fats while taking anastrozole?

A: No, it’s important to include healthy fats in your diet, such as those found in avocados, nuts, seeds, and olive oil. Focus on limiting saturated and trans fats.
A: No, it’s important to include healthy fats in your diet, such as those found in avocados, nuts, seeds, and olive oil. Focus on limiting saturated and trans fats.


  1. National Cancer Institute. (2020). Anastrozole. Retrieved from

Hayden Vanderwaal

Over the course of his more than two decades of practice, lifestyle medicine pioneer Hayden Vanderwaal has enabled patients to take control of their own health. At the School of Medicine Greenville, he completed his master's degree in lifestyle medicine. He has established a reputation for treating and preventing chronic illnesses with whole-person, evidence-based methods. To assist people in achieving their utmost well-being, Vanderwaal use integrative methods that include lifestyle modifications, physical activity, stress management, and nutrition. His goal is to revolutionize healthcare by promoting long-lasting behavioral adjustments that promote human flourishing.

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