How to Reduce the Risk of Breast Cancer by Consuming Oily Fish

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How to Reduce the Risk of Breast Cancer by Consuming Oily Fish

Breast cancer is one of the most common cancers among women. There are many factors contributing to the development of this much feared disease and diet is a very important one. A change in diet can do a great deal to prevent, and sometimes even treat, breast cancer. Omega-3 fatty acids – found in some freshwater fish and marine life – can play an important role. Scientific studies indicate that their regular intake can lower your risk of breast cancer by up to 14% by consuming two portions of oily fish every week. Find out what you can do to protect yourself.


Research on diet and breast cancer

A group of Chinese scientists compared data from different previously published studies that looked at the association between intake of fish and omega-3 polyunsaturated fatty acids (also known as n-3 PUFA) and the risk of breast cancer. 26 publications, examining 20,905 cases of breast cancer among 883,585 participants, were included in their meta-analysis. The results were published in 2013 in The British Medical Journal (BMJ).

The researchers concluded that higher consumptions of omega-3 from fish lowered the risk of breast cancer in the studied population. The participants were taking a combination of EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid), both an important types of omega-3 fats. For every 100 milligrams of omega-3 per day, the risk went down by 5%. The risk could be reduced by up to 14%, which presents a significant reduction that is attributed to one specific dietary habit.

The study provided support for the use of high-quality fish oil by women wishing to reduce their risk of breast cancer.

What should you eat?

We hear a lot about omega-3 and omega-6 fats. But the world of fatty acids is a complicated one. And when you try to establish what the best way to meet your daily requirements is, things can become even trickier. So here’s a short summary of the topic that might help clear up things a little bit.

Omega-3 and omega-6 polyunsaturated (long-chain) fats are considered essential for the functioning of your body. They build cells and support your brain and nervous system. Since the body can’t make them, they need to be supplied with food or alternatively, in the form of supplements. However, certain things need to be considered when you’re working out your best cancer-prevention diet:

  1. The ratio of omega-6 to omega-3

To be healthy, you need a ratio of 1:1 omega-6 to omega-3. Nowadays, the ratio is 15:1 in favor of omega-6 fatty acids. The problem is that too much omega-6 and not enough omega-3 can make you sick. Omega-6 acids act pro-inflammatory, and omega-3 are anti-inflammatory, so when the balance is disturbed, different chronic conditions can develop, including cancer, heart disease and autoimmune disease.

People in the developed world are often deficient in omega-3 acids. We consume too many sources of omega-6 (different processed vegetable oils, for example, soybean oil, safflower oil, sunflower oil and corn oil), while we ignore fish rich in omega-3. So, the first thing you should do is reduce your omega-6 consumption.

  1. Sources of omega-3

Omega-3 can be obtained from plants and different cold-water fish and marine life. Unfortunately for vegetarians and vegans, fish are a far superior source of omega-3.

Fatty fish contain both EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). DHA is extremely important for you and has been credited for bringing you the benefits of consuming omega-3 (and you can read more about the health benefits of omega 3 here).


When it comes to plant sources, such as flax seed oil, chia seeds and walnuts, they contain only ALA (alpha-linoleic acid), which are shorter chain omega-3. Under the right circumstances, ALA can convert into other omega-3 acids, but the conversion is poor and it becomes even more challenging in people who are already deficient in certain nutrients.

Also, the study mentioned above, found no association between ALA and cancer risk reduction.

Best sources of omega-3 for breast cancer prevention

The following fish are a good source of omega-3:

  • Wild salmon
  • Mackerel
  • Sardines
  • Anchovies

How much fish you should eat

If you are healthy and you are trying to maintain your health, Chris Kresser, an authority in the fields of nutrition and integrative medicine, recommends eating 6 oz. (180 grams) portions of fatty fish 2 to 3 times a week. Eating fish will provide you with sufficient amounts of EPA and DHA, and also supply you with protein, selenium and vitamin D.

If you are already suffering from a chronic condition, you might need to use supplements alongside whole fish. Kresser suggests taking 1 gram of high-quality fish oil daily and combining this with eating fish 2 to 3 times a week. This will ensure you receive a therapeutic dose of DHA, which is 1.5 grams per day.


A normal-size serving of salmon fillet contains up to 3 grams of EPA/DHA (depending on the time of year, how it’s prepared and where it’s coming from)

Fish or fish oil?

This is a dilemma for many, and different authors have a different opinions on the subject. I’ve already mentioned the view of Chris Kresser, who advocates the use of fish oil capsules only for certain groups of people.

The results of the analysis published in BMJ, however, favored fish oil when it came to breast cancer prevention.

If you buy supplements, make sure they contain both EPA and DHA. To improve the absorption of fish oil, you need to take the capsules with a high-fat meal. For example, if you take the supplement together with olive oil, the body will be able to use it much better compared to when taken alone.

Taking omega 3 is also one of the 70 habits featured in my e-book 70 Powerful Habits For A Great Health which will guide you how to take positive steps to improve your wellness and overall health.

In brief

According to current literature, if you want to reduce your risk of breast cancer (and some other cancers, too), you should:

  • Include fatty fish on your menu 2 to 3 times a week.
  • Limit your omega-6 intake.
  • Consider a high quality fish oil supplement.

You can read my other breast cancer related articles:
5 Unconventional Signs of Breast Cancer
The Best 7 Foods for Breast Cancer Prevention
5 Surprising Facts You Didn’t Know About Mammograms
Breast Cancer and Bras – Is It Time to Ditch Your Bra?

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8 Responses to How to Reduce the Risk of Breast Cancer by Consuming Oily Fish

  1. amber says:

    Another way to get the omega 3 you need is to take Advocare omegaplex.
    I take it daily with my dinner.

  2. Paulette Masley says:

    i have tried fish oil, omega 3. While it is astounding the mental clarity, my face becomes so oily I can’t stand it!! Any suggestions? And this comes from only one omega 3 a day!!

    • Jenny says:

      I have seen several references that claim that some individuals complain of suffering from oily skin when taking fish oil (see here and here). It usually happens if they start taking a high dose too quickly (although this is not your case). Maybe try to reduce the amount to one tablet every subsequent day and see if there is any improvement, or as an alternative to supplement, eat cold water fatty fish 2-3 times a week and see if it makes any difference.
      Read more :

  3. J. R. says:

    Did you ever wonder where from fish get omega 3??
    Fish and shellfish ingest and accumulate omega-3 fatty acids through the food chain from algae and phytoplankton, the primary producers of marine omega-3 fatty acids.

  4. Digna says:

    I m vegetarian .So, what will I do for protection?

  5. Ben says:

    It says stay away from omega-6 but doesn’t list what is high in omega-6.

    • Jenny Hills says:

      Hi Ben, it is said in the article ” We consume too many sources of omega-6 (different processed vegetable oils, for example, soybean oil, safflower oil, sunflower oil and corn oil). See under the subtitle “The ratio of omega-6 to omega-3”.

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