Dante Carrillo
Diet is a significant factor in cancer treatment and prevention. Research suggests that a healthy and balanced diet can reduce the risk of cancer, while an unhealthy diet can increase the risk. Certain foods and drinks, such as processed and red meat, alcohol, and sugary beverages, are linked to a higher risk of specific cancers. On the other hand, a diet rich in plant-based proteins, whole grains, vitamins, and minerals can help maintain a healthy weight and may offer protection against cancer. While specific dietary components have been studied for their potential links to cancer risk, the overall diet appears to have a more significant impact than any individual food or ingredient. Physical activity also plays a crucial role in cancer prevention, as it may help prevent weight gain and lower the risk of certain cancers.
| Characteristics | Values |
|---|---|
| Alcohol | Increases the risk of developing cancers of the oral cavity, pharynx, larynx, esophagus, liver, breast, colon, and rectum |
| Sugary food and drinks | Obesity caused by these is a cause of 13 different types of cancer |
| Processed and red meat | Can increase the risk of bowel cancer |
| Charred meat | Contains chemicals called HCAs and PAHs that cause cancer in animals; unclear if it causes cancer in humans |
| Cruciferous vegetables | Contain chemicals called glucosinolates, which are being studied for possible anti-cancer effects |
| Physical activity | Linked to a lower risk of several types of cancer |
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What You'll Learn
Obesity and weight gain
Obesity and being overweight are linked to an increased risk of cancer. Research shows that obesity and being overweight are causes of at least 13 types of cancer. The risk of cancer increases with the amount of excess weight a person has and the length of time they are overweight. Obesity can cause long-lasting inflammation and higher-than-normal levels of insulin, insulin-like growth factor, and sex hormones. These changes may lead to cancer.
People with obesity often have high blood levels of insulin and insulin-like growth factor-1 (IGF-1), which is linked to the development of type 2 diabetes, another known risk factor for cancer. High levels of insulin and IGF-1 may promote the development of colon, kidney, prostate, and endometrial cancers. Obesity is also associated with chronic inflammatory conditions such as gallstones or non-alcoholic fatty liver disease, which can cause oxidative stress, leading to DNA damage and an increased risk of biliary tract and other cancers.
Weight gain and obesity can affect cancer risk through impaired tumor immunity and changes in the mechanical properties of the scaffolding tissue surrounding developing tumors. Obesity can also lead to difficulties in cancer screening and management. For example, obese women have an increased risk of cervical cancer due to less effective cervical cancer screening.
It is important to note that the relationship between weight and cancer risk is complex. While obesity is a risk factor, weight loss in people with obesity may not always be associated with a reduced risk of cancer. For example, in a study of weight and breast cancer, weight change (either gain or loss) was not associated with breast cancer risk among women who were already overweight or obese. However, sustained weight loss was associated with a lower risk of breast cancer in women over 50.
To reduce the risk of obesity-associated cancer, maintaining a healthy weight through a balanced diet and regular physical activity is recommended. Healthcare providers can help patients achieve a healthy weight by measuring weight, height, and body mass index (BMI) and providing resources for healthy eating and physical activity.
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Processed and red meat
Consuming processed and red meat has been linked to an increased risk of cancer. Processed meat, which includes meat that has been smoked, cured, or salted for preservation, contains chemical additives such as nitrates and nitrites. These additives, as well as naturally occurring chemicals in the meat, can form N-nitroso chemicals (NOCs) during digestion. NOCs have been found to damage the cells lining the bowel, leading to an increased risk of bowel cancer. The World Health Organization (WHO) has classified processed meat as a Group 1 carcinogen, indicating sufficient evidence of its carcinogenicity in humans.
Red meat, including beef, pork, and lamb, is considered a probable cause of cancer. While the evidence is not as strong as for processed meat, studies suggest a positive association between red meat consumption and the development of colorectal cancer. Additionally, there is limited evidence of links to pancreatic and prostate cancer. The specific chemical compound responsible for the potential carcinogenicity of red meat is haem, which, when broken down in the gut, forms NOCs similar to those found in processed meat.
The link between processed and red meat consumption and cancer has led to dietary recommendations to reduce the risk of cancer. The WHO advised moderating the consumption of processed meat to lower the risk of colorectal cancer as early as 2002. Similarly, the Cancer Council recommends limiting red meat intake to one serving per day or two servings 3-4 times per week. They also suggest cutting out processed meat altogether or keeping it to a minimum.
It is important to note that the evidence for the link between red meat and cancer is not as strong as it is for processed meat. However, the small increases in cancer risk associated with high consumption of red meat could have significant public health implications due to the widespread consumption of meat worldwide, especially in low- and middle-income countries. As a result, organizations like IARC aim to provide scientific evidence to inform nutritional guidelines related to cancer prevention.
In summary, the consumption of processed and red meat has been associated with an increased risk of cancer, particularly bowel cancer. The presence of NOCs formed during the digestion of these meats is a key factor in this link. To reduce their cancer risk, individuals are advised to limit their intake of processed and red meat, with processed meat being a higher priority for reduction due to its stronger classification as a carcinogen.
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Alcohol consumption
The link between alcohol consumption and cancer development is well-established. Alcohol drinking is listed as a known human carcinogen by the National Toxicology Program of the US Department of Health and Human Services. Studies have consistently shown that alcohol consumption, especially in heavy or regular amounts, increases the risk of developing cancers in various parts of the body. These include the oral cavity (excluding the lips), pharynx (throat), larynx (voice box), oesophagus, liver, breast, colon, and rectum. The risk is not limited to heavy drinkers, as even those who have no more than one drink per day or engage in binge drinking have a modestly increased risk of certain cancers.
The mechanism by which alcohol consumption increases cancer risk involves multiple factors. Firstly, alcohol can affect hormone levels, such as estrogen, which influence cell growth and division. The more cells divide, the higher the chances of mutations and cancer development. Secondly, alcohol impairs the body's ability to absorb essential nutrients that offer protection against cancer, including vitamins A, B1, B6, C, D, E, K, and folate, as well as minerals like iron and selenium. This reduced nutrient absorption can leave the body more vulnerable to cancer development.
Additionally, alcohol consumption can lead to weight gain, as it contributes to excess calorie intake. Excess weight is a risk factor associated with over 12 types of cancer. Furthermore, the body metabolizes alcohol through enzymes like alcohol dehydrogenase (ADH), which converts ethanol into the carcinogenic metabolite acetaldehyde. The accumulation of acetaldehyde can have unpleasant effects, such as facial flushing and heart palpitations. However, some individuals can become tolerant of these effects and consume larger amounts of alcohol, increasing their risk of alcohol-related cancers, especially esophageal and head and neck cancers.
It is worth noting that the link between alcohol consumption and cancer development is not limited to heavy drinkers. As Therese Bevers, M.D., medical director of MD Anderson's Cancer Prevention Center, states, "every time you drink, you increase your cancer risk." Therefore, the general recommendation for cancer prevention is to avoid alcohol consumption altogether. However, for those who choose to drink, it is important to practice moderation and be aware of the serving recommendations for men and women, as their bodies differ in how they respond to and metabolize alcohol.
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Charred meat
While studies of human populations have not yet shown definitively that any dietary component causes or protects against cancer, some studies have indicated that people with and without cancer differ in their intake of certain dietary components. One such component is charred meat.
Extended exposure to HCAs and PAHs can damage DNA, which over time can develop into tumors. Laboratory experiments have found that HCAs and PAHs are mutagenic, meaning they cause changes in DNA that may increase the risk of cancer. Studies in animal models have shown that exposure to high levels of HCAs and PAHs can cause cancer in animals, but it is still unclear whether such exposure causes cancer in humans. However, long-term exposure to these chemicals has been linked to an increased risk of certain types of cancer, including prostate, colon, and pancreatic cancers.
To reduce the risk of exposure to HCAs and PAHs when cooking meat, it is recommended to avoid direct exposure of meat to an open flame or a hot metal surface and to avoid prolonged cooking times, especially at high temperatures. Using a microwave oven to cook meat prior to exposure to high temperatures can also reduce HCA formation. Continuously turning the meat over on a high heat source can help reduce HCA formation compared to leaving the meat on the heat source without flipping it frequently. Removing charred portions of meat and refraining from using gravy made from meat drippings can also lower the risk of exposure to these harmful chemicals.
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Cruciferous vegetables
While there is no definitive evidence that any dietary component causes or protects against cancer, studies have shown that eating certain vegetables can reduce the risk of developing cancer. Cruciferous vegetables, in particular, have been linked to cancer prevention.
Sulforaphane, a phytochemical found in cruciferous vegetables, has been linked to reducing the risks of several types of cancer, including prostate, breast, colon, and oral cancers. Studies have shown that sulforaphane can inhibit cancer enzymes, protect against inflammatory diseases, and prevent cancerous cells from forming. For example, cohort studies in the Netherlands, the United States, and Europe have generally found little or no association between cruciferous vegetable intake and prostate cancer risk. However, some case-control studies have found that individuals who consumed larger amounts of cruciferous vegetables had a lower risk of developing prostate cancer.
In the case of lung cancer, most studies have reported little association between cruciferous vegetable intake and lung cancer risk. However, one US analysis showed that women who consumed more than five servings of cruciferous vegetables per week had a lower risk of developing lung cancer. Similarly, for breast cancer, while some studies have found no association between cruciferous vegetable intake and breast cancer risk, a case-control study found that women who ate larger amounts of these vegetables had a reduced risk of breast cancer.
In addition to their potential cancer-fighting properties, cruciferous vegetables offer a range of other health benefits. They can help prevent cardiovascular disease, cardiometabolic disease, and digestive issues. Committing to eating cruciferous vegetables three times a week can decrease the risk of other illnesses, such as heart disease, irritable bowel syndrome (IBS), gastrointestinal illness, and high blood pressure.
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Frequently asked questions
Some foods that can increase the risk of cancer are red meat, processed meat, sugar, and alcohol.
Yes, eating foods high in fibre, such as whole grains, and dairy products can help reduce the risk of bowel cancer.
A person's diet can affect their health in many ways and can increase or decrease their risk of cancer. Eating a healthy and balanced diet can help maintain a healthy weight, which is important as obesity is linked to an increased risk of several types of cancer.
A cancer treatment diet is important as it can help manage the side effects of treatment, such as constipation and fatigue, and fluctuations in appetite and body weight. It is recommended to eat foods high in protein, healthy fats, whole grains, and vitamins and minerals. Plant-based proteins are ideal as they offer high levels of vitamins and minerals.
