Karen Collins, MS, RDN, CDN, FAND
American Institute for Cancer Research
Q: Why do nutrition recommendations talk about limiting red? Can't I keep my saturated fat low by simply choosing lean cuts?
A: When eating red meat (beef, pork or lamb), choosing lean cuts is important in order to limit saturated fat and avoid excess calories. But eating too much of any red meat – more than 18 ounces cooked, weekly – increases risk for colorectal cancer. Red meats that are processed – such as bacon, hot dogs and sausage – are also available in leaner forms, yet even small amounts of these meats, eaten regularly, lead to higher risk for colorectal cancer. Processed meats are also consistently linked to increased risk of heart disease and type 2 diabetes.
There are several potential theories as to why red meat may link to increased risk of these chronic diseases. Red meat (especially beef and lamb) is high in a form of iron called heme iron. Heme iron is also found in smaller amounts in chicken and fish. Higher heme iron content may partly explain links between excess red meat and risk of colon cancer, since it seems to promote formation of compounds that can damage intestinal cells. Some large population studies link higher consumption of heme iron and heme iron from red meat with increased risk of heart disease and type 2 diabetes, respectively.
Emerging research also suggests that bacteria in the gut may play a role. It may convert compounds in red meat to substances that promote atherosclerosis (“hardening of the arteries”) and/or cause less healthful types of bacteria in the intestinal tract to flourish.
Since unprocessed red meat in excess amounts is linked to colon cancer and may pose other health risks, choose lean cuts of fresh meat and also limit amounts to no more than 18 ounces per week. And be sure to save processed meats for special occasions.
The American Institute for Cancer Research (AICR) is the cancer charity that fosters research on the relationship of nutrition, physical activity and weight management to cancer risk, interprets the scientific literature and educates the public about the results. It has contributed over $105 million for innovative research conducted at universities, hospitals and research centers across the country. AICR has published two landmark reports that interpret the accumulated research in the field, and is committed to a process of continuous review. AICR also provides a wide range of educational programs to help millions of Americans learn to make dietary changes for lower cancer risk. AICR is a member of the World Cancer Research Fund International (WCRF).
Published on 04/06/2015