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Study: Drinking coffee or tea may improve survival after breast cancer

In a study of 8,900 women with stage 1, 2 or 3 breast cancer, those who drank coffee survived longer after a breast cancer diagnosis than those who did not drink coffee. Both coffee and tea were linked to improved survival from any cause. Several factors were linked to greater coffee or tea consumption, so this finding must be taken with some caution. However, breast cancer survivors who are regular coffee or tea drinkers may find this research reassuring.  (posted 8/31/21)

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Contents

At a glance Clinical trials
Study findings Guidelines
Strengths and limitations Questions for your doctor
What does this mean for me? Resources
In-depth  

 

STUDY AT A GLANCE

What is this study about?

This study looks at how drinking coffee or tea affects the survival of people who are diagnosed with 1, 2 or 3 breast cancer.

 

Why is this study important?

Many people regularly drink coffee and tea. This study finds that these beverages are not harmful and may be linked to a lower risk of death after a breast cancer diagnosis. For breast cancer survivors who are concerned with how diet affects their chance of cancer returning, this study adds some clarity to one part of daily life.

 

Study findings

This study looked at coffee and tea intake among 8,900 participants with stage 1, 2 or 3 breast cancer. Participants self-reported their breast cancer diagnosis, which was then confirmed by medical records and pathology reports. Every four years for up to 30 years, participants were asked to complete a food frequency questionnaire (FFQ) describing what they ate and drank. The average follow-up time was 11.5 years. Death reports were confirmed by death certificates and medical record reviews by physicians for the cause of death.

During the study, 1,054 participants died of breast cancer and 2,501 died of any cause (including breast cancer). Participants drank 1.7 cups of coffee and 0.7 cups of tea daily on average after their breast cancer diagnosis.

 

Drinking coffee lowers the risk of dying from breast cancer

Participants who drank coffee after their breast cancer diagnosis survived longer than participants who did not drink coffee. The more coffee they drank, the more their chance of breast cancer survival improved. Participants who drank coffee also had fewer deaths from any cause.
 

Drinking tea and the risk of dying from breast cancer

Participants who drank more tea had a lower risk of dying from any cause than those who did not drink tea. (Their breast cancer survival was not improved or worsened.)

Coffee drinking before breast cancer diagnosis was not linked to breast cancer survival

Coffee and tea consumption before a breast cancer diagnosis was not linked to breast cancer-specific death. In other words, how much coffee a person drank before diagnosis did not affect their breast cancer survival.  One exception was an increased risk among participants who drank more coffee before being diagnosed but drank less coffee after they were diagnosed.

Decreasing coffee consumption after breast cancer diagnosis increased risk

Participants who lowered their coffee intake from more than two cups per day before breast cancer diagnosis to no coffee after diagnosis had a 91 percent higher risk of breast cancer-related death than participants who did not drink coffee before or after a breast cancer diagnosis.

Participants who lowered their coffee intake from more than two cups per day before breast cancer diagnosis and then drank less (up to 2 cups of coffee each day) after diagnosis had a 34 percent higher risk of breast cancer-related death than participants who did not drink coffee before or after a breast cancer diagnosis.

Other factors may influence the risk of breast cancer death among coffee drinkers

Researchers mentioned several factors with impacts on survival that could not be separated from coffee or tea intake. Participants with higher coffee consumption after diagnosis were also:

  • more likely to drink more alcohol, smoke, consume more animal fat and use aspirin more frequently after diagnosis.
  • less likely to have radiotherapy or chemotherapy.

Researchers tried to account for the potential effect of other factors in their analysis. However, the findings regarding coffee or tea consumption may be due in part to these confounding factors.

Researchers noted that several factors did not contribute to the effects observed, including:

  • age
  • body mass index (BMI) after breast cancer diagnosis
  • stage of cancer
  • amount of coffee or tea consumed on average before breast cancer diagnosis

 

Strengths and limitations

Overall, this is a well-designed and appropriately analyzed study. The researchers were careful to point out weaknesses as well as highlight major findings.

Strengths

  • A major strength of this study is that 8,900 participants were enrolled. Larger studies are typically more accurate because there is a greater chance of detecting differences when they occur.
  • Another strength is the regular follow-up on participants’ health rather than relying on memory recall of health and diet history.
  • The follow-up period was long (11.5 years on average), allowing a comprehensive understanding of participants’ coffee and tea consumption.
  • Self-reports of health and breast cancer diagnosis were validated with a review of medical records and where needed, testing tumor tissue to verify cancer type.

Limitations

  • Confounding factors are the biggest limitations of this study. Several factors (smoking, alcohol consumption and less use of chemotherapy and radiation therapy) vary in the same way that coffee and tea consumption do. For example, people who drank more coffee usually smoked more and drank more alcohol. While the researchers used statistical tools to ask whether these factors rather than coffee were responsible for the findings, a concern remains that the decrease in risk of breast cancer deaths may be from a combination of these factors in addition to coffee or tea consumption.
  • The study population was not diverse. Most participants were well-educated, non-Hispanic white women. These findings may not be generalizable to the more diverse U.S. population.
     

What does this mean for me?

If you are a breast cancer survivor, this study suggests that drinking coffee will not increase your chance of dying of breast cancer and may improve your chance of breast cancer-related survival. Individuals who drank more than three cups of coffee daily had the best survival. However, decreasing your coffee consumption after diagnosis to less than what it was before diagnosis may decrease your chance of breast cancer-related survival. Drinking tea may increase your overall survival, but this study found that it has little effect on breast cancer-specific survival.

Ask your healthcare provider whether drinking coffee or tea is okay for your situation and health history. Some people need to avoid caffeine from coffee, tea or other sources for other medical reasons.

Share your thoughts on this XRAY review by taking our brief survey.  

posted 8/31/21


Reference

Farvid MS, Spence ND, Rosner BA, et al. Post-diagnostic coffee and tea consumption and breast cancer survival. British Journal of Cancer. 2021. 124:1873-1881.

Disclosure

FORCE receives funding from industry sponsors, including companies that manufacture cancer drugs, tests and devices. All XRAYS articles are written independently of any sponsor and are reviewed by members of our Scientific Advisory Board before publication to assure scientific integrity.

 

Expert Guidelines

Nutrition for people diagnosed with cancer

The National Comprehensive Cancer Network (NCCN) recommends the following for cancer survivors: 

  • Think about your food choices and the amount of fruits, vegetables and unrefined grains you eat compared with red and processed meats, alcohol, and foods or beverages with added fat or sugar. 
  • Think about your eating habits, including portion size, snacking, how often you eat out and the use of added fats or sugars.
  • All survivors should be encouraged to:
    • Make informed choices about food to ensure variety and adequate nutrient intake.
    • Limit refined sugars.
    • Eat a diet that is at least 50% plant-based, consisting mostly of vegetables, fruit and whole grains.
    • Track calorie intake; monitoring calories is an effective way to manage weight.
    • Minimize alcohol to no more than one drink per day for a woman and two drinks per day for a man.
  • For patients desiring further dietary guidelines, the USDA approximate food plate volumes are:
    • Vegetables and fruits should comprise half the volume of food on the plate
    • Vegetables: 30% of plate; fruits: 20% of plate
    • Whole grains: 30% of plate
    • Protein: 20% of plate
  • Recommended sources of nutrients:
    • Fast: Plant sources such as olive or canola oil, avocados, seeds and nuts, and fatty fish.
    • Carbohydrates: Fruits, vegetables, whole grains and legumes.
    • Protein: Poultry, fish, legumes, low-fat dairy foods, and nuts.

The Academy of Nutrition and Dietetics, the United States Office of Disease Prevention and Health Promotion and the American Institute for Cancer Research also publish expert guidelines on nutrition and health. 

Updated: 12/12/2021

Questions To Ask Your Doctor

  • What lifestyle factors most affect my chance of cancer recurrence?
  • Do you recommend that I change my diet?
  • Do you recommend that I change my coffee or tea consumption?
  • Would I benefit from talking to a nutritionist?

Open Clinical Trials

The following studies focus on nutrition for people diagnosed with breast cancer:

Visit our Featured Research Page and Research Search and Enroll Tool to find additional studies enrolling people with or at high risk for cancer.

Updated: 05/31/2024

Find Experts

The following resources can help you locate a nutritionist near you or via telehealth

Finding nutritionists

  • You can find a registered dietician in your area through Eatright.org, the website for the Academy of Nutrition and Dietetics. Search for nutritionists by specialty, including "cancer," "weight management" and "heart health."

Related experts

  • The Livestrong at the YMCA program includes a free 12-week membership and fitness training with certified exercise experts. You can search by zip code for a program near you.  

Other ways to find experts

  • Register for the FORCE Message Boards and post on the Find a Specialist board to connect with other people who share your situation. 
  • The National Cancer Institute (NCI)-Designated Comprehensive Cancer Centers have specialists to manage the symptoms and side effects of cancer prevention or treatment. 
  • FORCE partners with Savor Health® to provide free, personalized, evidence-based nutrition support 24/7 and “on-demand" through their text-based Intelligent Nutrition Assistant (Ina®). You can subscribe here.

Updated: 11/20/2023

Who covered this study?

Real Health

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