Dante Carrillo
Diet is an important factor in preventing cancer. While there is no 'anti-cancer diet' to prevent cancer, eating a healthy, balanced diet can help reduce your risk. Observational studies have indicated that high consumption of certain foods may increase the likelihood of developing cancer. For example, diets high in fat, sugar, salt, and processed foods can lead to weight gain, which increases the risk of at least 13 different types of cancer. In contrast, diets rich in fibre, whole grains, vitamins, minerals, and antioxidants have been linked to a reduced risk of cancer. Additionally, limiting alcohol intake and avoiding red and processed meats can also lower cancer risk.
| Characteristics | Values |
|---|---|
| Role of diet | Diet influences the risk of developing some cancers and can help prevent cancer. |
| Foods to eat | Fruits, vegetables, plant-based proteins, lean animal proteins, whole grains, foods high in fibre, folic acid, vitamin B-6, vitamin B-12, vitamin D, chlorophyll, antioxidants, probiotics, selenium |
| Foods to avoid | Sugary and high-calorie foods, ultra-processed foods, red meat, alcohol, artificial sweeteners |
| Other factors | Smoking, obesity, sun exposure, physical activity levels |
| Cancer treatment | Diet plays a role in how a person feels during chemotherapy or radiation therapy, helping with nausea and maintaining energy. |
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What You'll Learn
- A healthy, balanced diet can help maintain a healthy weight, reducing the risk of cancer
- Selenium, folic acid, vitamin B-12, vitamin D, chlorophyll, and antioxidants may help prevent cancer
- High-fibre foods, including wholegrains, can help reduce the risk of bowel cancer
- Processed and red meat can increase the risk of bowel cancer
- Alcohol is a known cause of at least seven types of cancer
A healthy, balanced diet can help maintain a healthy weight, reducing the risk of cancer
Eating a healthy, balanced diet can help maintain a healthy weight, reducing the risk of cancer. While there is no specific anti-cancer diet, a healthy diet can help to reduce the risk of at least 13 types of cancer. Eating lots of sugary, high-calorie, high-fat, and salty foods can lead to weight gain and obesity, which increases the risk of cancer. Therefore, it is important to eat a balanced diet with a variety of nutritious foods from all food groups. This includes consuming plenty of fruits and vegetables, which are rich in vitamins, minerals, and antioxidants, and have been linked to a lower risk of lung cancer.
Whole grains, beans, legumes, nuts, and seeds are also recommended as part of a healthy diet. When choosing carbohydrates, opt for minimally processed options like whole wheat, bran, and oats, which are high in soluble fiber. This helps maintain good gut health and promotes the production of short-chain fatty acids, which are beneficial for metabolism and cellular repair. In addition, include lean animal proteins such as chicken or fish, and plant-based proteins like vegetables, beans, and legumes, which offer high levels of vitamins and minerals.
Some specific nutrients that may have cancer-preventative effects include selenium, folic acid, vitamin B-12, vitamin D, chlorophyll, and antioxidants such as carotenoids. Folic acid, found in dark green leafy vegetables, plays an integral role in DNA methylation and synthesis, and higher intakes have been linked to a reduced risk of colon, rectal, and breast cancer. Vitamin D, while primarily associated with bone and teeth health, has also been studied for its potential associations with cancer risk.
It is important to note that while diet plays a significant role in cancer prevention, other lifestyle factors, such as smoking, alcohol consumption, sun exposure, and physical activity levels, also influence cancer risk. Additionally, the therapeutic value of food in treating existing cancer is less clear, and claims that specific foods or supplements can cure cancer should be viewed with skepticism. Overall, maintaining a healthy, balanced diet that supports a healthy weight is a crucial step in reducing the risk of cancer.
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Selenium, folic acid, vitamin B-12, vitamin D, chlorophyll, and antioxidants may help prevent cancer
A healthy and balanced diet can help reduce the risk of cancer. Eating a lot of sugary, high-calorie, high-fat, and salty foods can lead to weight gain, and obesity increases the risk of at least 13 types of cancer. However, certain nutrients found in specific foods may help prevent cancer.
Selenium
Selenium is a mineral element that is often considered a dietary antioxidant. Observational studies and randomized controlled trials have shown that selenium can have a beneficial effect on cancer prevention. For example, Clark LC et al.'s randomized controlled trial showed that selenium supplements decreased the risk of colorectal cancer in people with skin carcinoma. However, other studies have found null associations between selenium and cancer.
Folic Acid
Folic acid is a synthetic supplemental form of folate, which is important for cell growth and division. Folic acid supplementation has been shown to reduce the risk of neural tube birth defects in offspring. Folic acid therapy has also been shown to reduce serum uric acid in hypertensive patients. However, no sources explicitly mention folic acid's impact on cancer prevention.
Vitamin B-12
Vitamin B-12 is needed to maintain bodily functions, and a deficiency can lead to anemia and irreversible neurological symptoms. Several studies have shown that low plasma vitamin B-12 concentrations are associated with cancer. However, there is also evidence of high plasma vitamin B-12 concentrations being associated with cancer and cancer-related mortality, as well as studies showing no association. The relationship between vitamin B-12 and cancer is still under evaluation.
Vitamin D
Vitamin D has been found to have several biological activities that might slow or prevent the development of cancer, including decreasing cancer cell growth and stimulating cell death. However, most randomized controlled trials have found that vitamin D supplements do not reduce the risk of developing cancer overall or developing specific cancers.
Chlorophyll
Chlorophyll is a natural compound found in green plants, and it is present in high concentrations in green vegetables. Studies have found that chlorophyll can form close bonds with carcinogenic chemicals called aflatoxins, blocking their absorption in the intestines and preventing damage to genes. Research in early human studies has shown that taking 100-milligram doses of chlorophyllin three times a day for four months decreased aflatoxin damage to DNA by up to 55%.
Antioxidants
Antioxidants are chemicals that interact with and neutralize free radicals, thus preventing them from causing damage. The body relies on dietary sources of antioxidants, which are found in fruits, vegetables, and grains. Laboratory and animal studies have shown that increased levels of exogenous antioxidants can prevent the types of free radical damage associated with cancer development. However, randomized controlled trials of dietary antioxidant supplements for cancer prevention have not provided evidence of their effectiveness.
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High-fibre foods, including wholegrains, can help reduce the risk of bowel cancer
A healthy and balanced diet can reduce the risk of cancer. Eating a lot of sugary, high-calorie, high-fat, and high-salt foods can lead to weight gain, which increases the risk of at least 13 types of cancer. Obesity is a significant risk factor for cancer, and maintaining a healthy weight is crucial for reducing cancer risk.
Fibre-rich foods are often low in calories and packed with nutrients. They help lower cholesterol and stabilize blood sugar levels, which is beneficial for diabetics or those at risk of becoming diabetic. Fibre also protects the intestinal lining and improves bowel movements, aiding digestive problems.
The recommended fibre intake for adults is 30–35 grams per day for men and 25–32 grams per day for women, offering benefits to the gut microbiome and metabolic health. It is important to increase fibre intake gradually, as adding large amounts too quickly can cause discomfort.
In addition to helping prevent cancer, a diet rich in high-fibre foods can make you feel fuller for longer, reducing overall calorie intake and aiding weight management.
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Processed and red meat can increase the risk of bowel cancer
A healthy and balanced diet can reduce the risk of cancer. Eating lots of sugary and high-calorie foods that are high in fat, sugar, and salt can lead to weight gain, and obesity increases the risk of at least 13 types of cancer.
Processed meat and red meat are among the foods that can increase the risk of cancer. Processed meat has been classified in the same category as other causes of cancer such as tobacco smoking and asbestos. It is believed that processed meat damages the cells of the bowel, making bowel cancer more likely. The World Health Organization (WHO) has classified processed meat as Group 1, or "carcinogenic to humans," based on sufficient evidence of carcinogenicity in humans. The IARC Working Group concluded that eating processed meat causes colorectal cancer, and an association with stomach cancer was also observed, although the evidence is not conclusive. An analysis of data from 10 studies estimated that every 50-gram portion of processed meat consumed daily increases the risk of colorectal cancer by about 18%.
Red meat has been classified as Group 2A, "probably carcinogenic to humans," by the WHO. This classification is based on limited evidence from epidemiological studies showing positive associations between eating red meat and developing colorectal cancer, as well as strong mechanistic evidence. While the evidence is not as strong as that for processed meat, studies suggest that if the association between red meat and colorectal cancer were proven causal, the risk of colorectal cancer could increase by 17% for every 100-gram portion of red meat consumed daily.
Processed meats are meats that have been preserved by smoking, salting, curing, or adding chemical preservatives. They include deli meats, bacon, and hot dogs. When these meats are preserved, cancer-causing substances form.
It is important to note that the risk of cancer associated with consuming processed and red meat is related to the amount of meat consumed. Reducing the intake of these meats or choosing leaner options, such as chicken or fish, can help lower the risk.
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Alcohol is a known cause of at least seven types of cancer
A healthy and balanced diet can help reduce the risk of cancer. Eating a lot of sugary, high-calorie, high-fat, and salty foods can lead to weight gain, and obesity increases the risk of at least 13 types of cancer. A balanced diet can help maintain a healthy weight and reduce this risk. A high-fibre diet with plenty of whole grains, for example, can help reduce the risk of bowel cancer.
During cancer treatment, a healthy diet is important to help patients feel their best. A cancer treatment diet can help patients maintain their energy levels and manage side effects like nausea. Plant-based proteins are recommended as they offer high levels of vitamins and minerals. Patients should also eat lean animal proteins, healthy fats, and minimally processed carbohydrates.
Alcohol contains ethanol, which the body breaks down into acetaldehyde, a known carcinogen. Acetaldehyde damages DNA and prevents cells from repairing this damage, allowing cancerous cells to grow. Alcohol also affects hormone levels, increasing oestrogen and insulin, which can make cells divide more often and increase the chances of cancer developing.
Alcohol also reduces the body's ability to absorb nutrients that protect against cancer, such as vitamins A, B1, B6, C, D, E, K, and folate, as well as iron and selenium. In addition, alcohol changes cells in the mouth and throat, making it easier for them to absorb harmful chemicals that cause damage. When combined with tobacco, alcohol further increases the risk of cancer by causing greater damage to cells and altering how toxic chemicals in tobacco smoke are broken down in the body.
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Frequently asked questions
Eating a healthy and balanced diet can reduce the risk of cancer. A healthy diet can help you maintain a healthy weight, which is important as overweight and obesity increase the risk of at least 13 types of cancer.
Ultra-processed foods that are high in fat, sugar, and salt can lead to weight gain and should be avoided. Alcohol is also a cause of at least 7 types of cancer and should be limited or avoided. Red and processed meat can increase the risk of bowel cancer.
A cancer-preventing diet should include protective elements such as selenium, folic acid, vitamin B-12, vitamin D, chlorophyll, and antioxidants. Plant-based proteins are recommended as they offer high levels of vitamins and minerals. Fill your plate with colourful vegetables, fruits, beans, and whole grains.
A healthy diet can enhance quality of life and treatment in people with cancer, helping to prevent malnutrition. It can also improve cardiovascular health and reduce inflammation in the body.
