Long term effects of eating dairy when lactose intolerant

Research has linked the high fat content and hormones in milk, cheese, and other dairy products to breast cancer.

One study of nearly 10,000 women found that those who consume low-fat diets have a 23% lower risk for breast cancer recurrence. They also have a 17% lower risk of dying from the disease.

A 2017 study funded by the National Cancer Institute that compared the diets of women diagnosed with breast cancer to those without breast cancer found that those who consumed the most American, cheddar, and cream cheeses had a 53% higher risk for breast cancer.

The Life After Cancer Epidemiology study found that, among women previously diagnosed with breast cancer, those consuming one or more servings of high-fat dairy products (e.g., cheese, ice cream, whole milk) daily had a 49% higher breast cancer mortality, compared with those consuming less than one-half serving daily.

Research funded by the National Cancer Institute, the National Institutes of Health, and the World Cancer Research Fund, found that women who consumed 1/4 to 1/3 cup of cow’s milk per day had a 30% increased chance for breast cancer. One cup per day increased the risk by 50%, and 2-3 cups were associated with an 80% increased chance of breast cancer. But the study cites research showing that vegans, but not lacto-ovo-vegetarians, experience less breast cancer than nonvegetarians. 

Regular consumption of dairy products has also been linked to prostate cancer.

High intakes of dairy products including whole and low-fat milk increase the risk for prostate cancer, according to a meta-analysis that looked at 32 studies. In another study, men who consumed three or more servings of dairy products a day had a 141% higher risk for death due to prostate cancer compared to those who consumed less than one serving. 

But avoiding dairy products and eating a more plant-based diet may help protect the prostate. A study published in the American Journal of Clinical Nutritionfound that men who followed a vegan diet had a 35% lower prostate cancer risk than those following a nonvegetarian, lacto-ovo-vegetarian, pesco-vegetarian, or semi-vegetarian diet. 

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What happens if you are lactose intolerant and you keep eating dairy?

What happens if you ignore lactose intolerance long term?

How long does lactose intolerance last after eating dairy?

Can lactose intolerance worsen over time?