Jeffrey Salazar
There is evidence to suggest that eating meat can cause cancer. The World Health Organization (WHO) has classified processed meats such as ham, bacon, salami, and frankfurters as Group 1 carcinogens, meaning they are known to cause cancer. Red meat, such as beef, lamb, and pork, has been classified as a Group 2A carcinogen, meaning it probably causes cancer. The WHO recommends that people who eat meat should moderate their consumption of processed meat to reduce the risk of colorectal cancer. Eating red meat has also been linked to an increased risk of colorectal cancer, especially if the meat has been smoked, cured, or salted. While poultry and fish are not classified as red meat and are not linked to an increased risk of cancer, it is important to note that the overall dietary pattern is more significant than any single meal when it comes to cancer risk.
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What You'll Learn
Processed meat is a Group 1 carcinogen
The World Health Organization (WHO) has classified processed meats, including ham, bacon, salami, and frankfurters, as Group 1 carcinogens. This classification means that there is strong evidence that these meats cause cancer.
The IARC Working Group, a research organization that evaluates the evidence on the causes of cancer, concluded that eating processed meat causes colorectal cancer. This conclusion was based on sufficient evidence from epidemiological studies. The Group also observed an association with stomach cancer, but the evidence is not yet conclusive.
The WHO's evaluation reinforces a 2002 recommendation that people who eat meat should moderate their consumption of processed meat to reduce the risk of colorectal cancer. The Global Burden of Disease Project estimates that about 34,000 cancer deaths per year worldwide are attributable to diets high in processed meat.
Processed meat is classified as a Group 1 carcinogen, the same category as tobacco smoking and asbestos. This classification does not mean that they are equally dangerous, but rather that there is convincing evidence that these agents cause cancer. The evaluation is based on epidemiological studies showing the development of cancer in exposed humans.
To reduce the risk of cancer, it is recommended to cut out processed meats or keep them to an absolute minimum.
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Red meat is a Group 2A carcinogen
Red meat has been classified as a Group 2A carcinogen, meaning that it is probably carcinogenic to humans. This classification is based on limited evidence from epidemiological studies that show a positive association between eating red meat and developing colorectal cancer, as well as strong mechanistic evidence.
The World Health Organization (WHO) has stated that individuals who eat meat should moderate their consumption of processed meat to reduce the risk of colorectal cancer. While the cancer risks associated with red meat consumption are not yet fully established, the WHO recommends limiting intake until updated guidelines related specifically to cancer are developed.
Several studies have investigated the cancer risks associated with different types of red meat, such as beef and pork, and various kinds of processed meats, like ham and hot dogs. While there is not enough information to determine whether higher or lower cancer risks are related to eating any particular type of red meat or processed meat, different preservation methods may result in the formation of carcinogens.
The curing of meats with nitrites, for example, can produce carcinogenic N-nitroso compounds (NOCs), and the smoking of meat produces polycyclic aromatic hydrocarbons (PAHs). The high-temperature cooking of meat also produces carcinogenic heterocyclic aromatic amines (HAAs). These chemicals can form DNA adducts, and if not repaired by enzyme systems, some of these DNA adducts can induce mutations during cell division and lead to the development of cancer.
It is important to note that the overall dietary pattern matters more than any single individual meal. While reducing intake of red and processed meat is recommended, it is not necessary to eliminate these foods entirely. Instead, individuals can aim to limit their consumption and increase their reliance on nutrient-rich whole foods.
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Cooking meat at high temperatures increases cancer risk
Consuming red meat and processed meat has been linked to an increased risk of cancer. While the link between red meat and cancer is not yet conclusive, processed meat has been classified as a Group 1 carcinogen, indicating sufficient evidence that it causes cancer.
Cooking meat at high temperatures is a contributing factor to this increased cancer risk. High-temperature cooking methods, such as grilling, pan-frying, barbecuing, and smoking, can lead to the formation of harmful compounds. Specifically, cooking meat at temperatures above 300 °F increases the formation of heterocyclic amines (HCAs) and polycyclic aromatic hydrocarbons (PAHs), which are carcinogens. These compounds are formed when the fatty juices of the meat drip and create a sear or crust on the outside, and they are also present in the smoke that encases smoked meats.
The consumption of HCAs and PAHs has been associated with DNA damage and an increased risk of cancer. Studies have shown that exposure to these compounds can cause cancer in animal models and lab-grown cells. The activity of certain enzymes in the body, which can vary between individuals, may also play a role in the cancer risks associated with HCAs and PAHs.
To reduce the formation of HCAs, it is recommended to use a microwave oven to partially cook the meat before exposing it to high temperatures. Continuously turning the meat over on a high heat source can also reduce HCA formation. Additionally, removing charred portions of meat and avoiding gravy made from meat drippings can help minimize HCA and PAH exposure.
While it is important to be mindful of the potential risks associated with cooking meat at high temperatures, it is also worth noting that a plant-based diet is generally recommended for cancer prevention. This involves filling two-thirds of your plate with whole grains, vegetables, fruits, beans, nuts, and seeds, while the remaining one-third can be lean protein, including chicken, fish, or plant-based sources.
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Obesity caused by ultra-processed foods increases cancer risk
Ultra-processed foods (UPF) are industrially manufactured foods with added ingredients or additives, such as modified starch and hydrogenated oils. They are convenient and ready-to-eat, but they have been linked to an increased risk of obesity and cancer. Obesity, in turn, is a significant risk factor for many cancers, including those of the digestive tract and some hormone-related cancers in women.
The intake of UPF has been associated with a higher risk of overall cancer, specifically breast cancer and colorectal cancer. A multinational study by the International Agency for Research on Cancer (IARC) found that increased consumption of UPF was linked to a higher risk of multimorbidity involving cancer and cardiometabolic diseases. This study included data from 266,666 men and women across seven European countries, where UPF consumption is estimated to make up more than half of a person's daily food intake.
The link between UPF and cancer is concerning, especially considering that UPFs are becoming a staple in the diets of many countries. These foods are often energy-dense, high in salt, sugar, and fat, and low in fibre, which can lead to overconsumption. Additionally, UPFs are aggressively marketed, promoting consumption and gradually displacing traditional dietary patterns based on fresh and minimally processed whole foods.
To reduce the risk of cancer, it is recommended to limit the consumption of UPFs and adopt a nutritionally balanced diet with more vegetables and fruits. While the occasional intake of red meat or processed meat may be enjoyable, it is important to aim for a balanced diet rich in whole foods.
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Meat alternatives can be nutritionally poor
While meat has been linked to an increased risk of cancer, particularly colorectal cancer, meat alternatives can also be nutritionally poor.
Meat alternatives, also known as "meat analogs", are food products that mimic the taste, texture, and appearance of meat, such as plant-based meat crumbles, bacon, burgers, and hot dogs. These alternatives are gaining popularity, especially among those who identify as "flexitarians", who consume meat at a reduced rate.
However, it is important to note that these meat alternatives may not provide the same nutritional benefits as meat. A study from Chalmers University, Sweden, examined the nutritional composition of many plant-based meat alternatives and found that most of these products fell short in important nutrients found in meat, particularly red meat, such as iron and zinc.
Iron and zinc deficiencies can be a concern, especially for certain vulnerable groups such as children aged 1.5-3.5 years, girls aged 11-18, and women aged 19-49. If these individuals do not consume adequate amounts of meat or take supplements, they may be at risk of anaemia when replacing meat with plant-based alternatives.
Additionally, many meat alternatives contain high levels of phytate, an antinutrient that inhibits the absorption of iron, zinc, and calcium in the gut. The presence of phytate can further compound the issue of iron and zinc deficiencies.
Furthermore, some meat alternatives are highly processed and may contain added sodium and other additives, which can pose possible health concerns.
Therefore, it is crucial to make informed choices when selecting meat alternatives. Opting for whole plant foods, such as beans, tofu, and lentils, as recommended by health professionals, can help ensure a nutritionally balanced diet while reducing meat consumption.
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Frequently asked questions
Yes, eating meat can cause cancer. Processed meat is a Group 1 carcinogen, meaning there is strong evidence that it causes cancer. Red meat is a Group 2A carcinogen, meaning it probably causes cancer.
Processed meats such as ham, bacon, salami, frankfurters, sausages, hot dogs, and corned beef are Group 1 carcinogens. Red meats such as beef, lamb, pork, veal, goat, mutton, venison, and goat are Group 2A carcinogens.
Poultry and fish are not linked to an increased risk of cancer. Chicken, turkey, and fish are not classified as red meat.
It is recommended to eat no more than 12 to 18 ounces (340 to 510 grams) of lean, cooked red meat per week and to avoid processed meats as much as possible.
Alternative sources of protein include poultry, seafood, dairy, eggs, tofu, edamame, beans, lentils, nuts, and seeds.
