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April 26, 2017 | 3 minute read

Do high-fat diets lead to cancer?

Do high-fat diets lead to cancer? Not necessarily. That’s a common concern though: The most recent AICR awareness survey shows that more than 4 in 10 people think that high-fat diets can be a cause of cancer. However, whether your diet is higher or lower in fat, it’s your overall eating choices that matter to reduce your risk of cancer.

Early research on diet and cancer risk did suggest a link to fat consumption, since countries with low fat intake (for example, Japan) had lower rates of cancer than countries (like the U.S.) with higher-fat diets. After further study, when scientists followed people over time and adjusted for other eating and lifestyle choices, differences in cancer risk no longer seemed related to fat consumption.

So what does today’s best science tell us about dietary fat in the big picture of healthy eating choices to help prevent cancer?

  • Limit fat from red meats, especially processed meats. High-fat diets can mean diets high in fatty, processed meats. Eating too much red meat (beef, pork and lamb) and processed meat increases risk of colorectal cancer – the third most common U.S. cancer. This risk seems related to other compounds in those meats, not the fat.

In addition to reducing colorectal and stomach cancer risk, limiting red and processed meats is recommended for heart health.

  • Make plant foods the focus. Center your meals and snacks around vegetables, fruits, whole grains and beans, which offer a wide range of nutrients, protective phytochemicals and dietary fiber.

Fat is the most concentrated source of calories, so if most of the foods you eat are high in fat it’s easy for relatively small portions to add up to excess calories. If those extra calories lead to weight gain, that is a very real concern for cancer risk, given that overweight and obesity are a cause of 11 cancers.

high fat diet

Dietary fats come in many forms.

  • Don’t be fat-phobic. You don’t need to steer clear of plant foods like nuts and avocados that are naturally high in fat. Although they are concentrated in calories, portions appropriate to your overall calorie needs will not derail weight management, and provide valuable nutrients while making healthy eating delicious.

Studies have found that low-fat diets are no better than other calorie-cutting diets for weight loss or avoiding weight gain. It’s consuming calories beyond what your body needs that leads to weight gain, whether those extra calories come from high-fat foods, high-sugar sweets and drinks, or excess portions.

  • Enjoy healthful oils to flavor foods while keeping total calories in check. With hunger-satisfying eating patterns that include abundant vegetables, modest amounts of oil don’t send total daily calories over the top. On the other hand, chips, cookies and ice cream (whether low-fat or high-fat) are “special occasion” foods in true Mediterranean-style eating.

From a health perspective, all fat is not the same. Even within categories of saturated and unsaturated fats, specific fatty acids (the building blocks of fat) may differ in how they promote health or bring potentially negative effects on insulin function, inflammation, heart health and cancer risk. Research is still in progress to provide clearer answers to these questions.

Removing fear of fat does not mean giving a green light to all high-fat foods. Focus on overall quality of foods you eat to promote health and reduce cancer risk.

AICR HealthTalk is by Karen Collins, MS, RDN.

2 comments on “Do high-fat diets lead to cancer?

  1. Evelyn on

    This article is misleading and confusing. Saturated fat is saturated fat. It is high in calories, leads to heart disease and cancer, and is found in animal-based foods. If you are looking for ways to reduce your weight and get healthy, eliminate saturated fat and trans fats from your diet. Eat foods that are whole, plant-based. You don’t have to restrict your calories if you eat vegetables and fruits. However, if you eat using butter, oil, saturated fat and trans fat, you will have to reduce your calories, and you will be HUNGRY. Discover herbs and spices to flavor your meals, and you can easily eliminate butter, oil, and other animal-based fats.

    Reply
    • Dennis on

      Your response is probably more misleading than the article is. Saturated fat does not necessarily behave in the body all the same. In fact, there is a growing body of evidence that it does not. You are incorrect to imply that saturated fat is an animal product exclusive. Saturated fat is found in plant sources as well. Eating a whole foods, plant-based diet does not necessarily eliminate saturated fat from the diet, but it can still be quite a healthful way to eat regardless. The jury is out, but eliminating every source of saturated fat from the diet may well turn out not to be important.

      Reply

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