Cancer Prevention Through Diet

Cancer prevention can take various forms: applying sunscreen, managing stress, and getting regular screenings. Recently, researchers have begun to focus on dietary choices and their impact.

Many experts agree that a diet rich in plant-based foods—like leafy greens, fruits, whole grains, and non-animal proteins—might help lower cancer risk. They provide essential vitamins, minerals, and compounds that contribute to health.

Tricia Scott-Sahler, an oncology dietitian at Hackensack Meridian John Theurer Cancer Center in New Jersey, emphasized that no single food can prevent or cure cancer. Rather, it’s the overall eating pattern that matters in reducing risk. She pointed out that diets centered around diverse plant foods—similar to traditional Mediterranean or some Asian cuisines—are linked to lower cancer risks.

Experts suggest that red meat—such as beef, pork, and lamb—should occupy a minimal space on one’s plate. Drawing insights from over 800 studies, they’ve tagged this protein as a Class 2b carcinogen, which suggests a probable cancer risk, particularly in relation to colorectal and stomach cancers.

While certain foods offer varied health benefits, nutrition’s real potential lies in how different nutrients cooperate. Scott-Sahler pointed out that specific nutrients can bolster various aspects of the immune system. For instance, omega-3 fatty acids found in fish are known to reduce inflammation, while garlic helps eliminate cancer precursor cells. Additionally, substances like beta-glucans in shiitake mushrooms stimulate immune activity, and just one daily Brazil nut provides selenium, aiding in the detection and eradication of unhealthy cells.

To guide patients through cancer treatment, Scott-Sahler creates personalized nutrition plans. She recently shared some foods she sees as protective against cancer.

Shiitake Mushrooms

Shiitake mushrooms offer a distinct, savory flavor that sets them apart from common white varieties. They’re a key ingredient in many East Asian dishes. Heating them brings out their umami taste, while dried versions lend a more earthy flavor to broths.

Scott-Sahler mentioned that these mushrooms contain polysaccharides called beta-glucans. One important beta-glucan is lentinan, which strengthens immune responses within the body. It binds to specific immune cell receptors, igniting a series of signals that enhance immune activity.

Natural killer cells seek and destroy cancer cells, while macrophages ramp up efforts to clear out damaged cells. T cells and B cells amplify the immune response by producing tumor-fighting signals and antibodies.

In Japan, lentinan is sometimes used as part of chemotherapy for specific cancers, with evidence indicating it aids immune cells in combatting tumors more effectively.

Lentils

Lentils are humble yet potent, according to Scott-Sahler, who wishes more patients would include them in their diets. These little legumes have been a staple in regions like Asia, the Mediterranean, and the Middle East for centuries.

Rich in fiber—about 16 grams per cooked cup—lentils can significantly lower the risk of colorectal cancer. Data suggest that such dietary fiber can reduce this risk anywhere from 9% to 47%. Fiber aids digestion and helps neutralize carcinogens. It’s also fermented by gut bacteria into butyrate, which can limit cancer cell growth and initiate programmed cell death in damaged cells.

Beyond fiber, lentils are loaded with bioactive compounds, including folate, which is crucial for maintaining healthy DNA and preventing mutations that may lead to cancer.

Sardines

Sardines are rich in omega-3 fatty acids, known for their role in cellular health. These fats can translate into compounds within the body that help manage chronic inflammation.

Scott-Sahler noted research linking these fatty acids to inhibited growth, spread, and metastasis of cancer cells. A long-term Swedish study showed that women consuming fatty fish weekly reduced their kidney cancer risk by up to 44%.

Regular sardine consumption has also been related to lower risks of colorectal cancer. Omega-3s promote beneficial gut bacteria, enhancing the immune system while suppressing harmful bacteria associated with tumor growth.

Garlic

Garlic, along with onions and other alliums, appears to offer protective qualities against various gastrointestinal cancers. Scott-Sahler recommends incorporating these foods for their health benefits.

When garlic is chopped or crushed, it activates compounds such as allicin that contribute to its health effects. Recent research indicates these compounds can slow the multiplication of cancer cells and induce programmed death in malignant cells.

Garlic has shown efficacy against several cancer types, including breast and colon cancers, by reducing inflammation and protecting against DNA damage.

Citrus

Citrus fruits like oranges and grapefruits contain compounds believed to bolster the body’s defense against cancer. Their high vitamin C content, along with flavonoids and hesperidin, acts as antioxidants that combat harmful free radicals.

Four weekly servings of citrus may cut cancer risk notably, Scott-Sahler mentioned—by over half for mouth and throat cancers, around 60% for esophageal cancer, and about 30% for stomach cancer.

However, she stressed that consuming the whole fruit provides better protection compared to juice, which often lacks fiber.

Kefir

Research into kefir, a fermented probiotic drink, indicates it might have protective effects against cancer. Laboratory studies suggest that compounds in kefir can inhibit cancer cell growth.

A 2021 meta-analysis confirmed these potential anticancer activities, revealing that kefir compounds could reduce the viability of various cancer cells significantly. Animal studies have shown similar results, particularly concerning colon cancer, highlighting beneficial changes in gut microbiota.

Turmeric

Turmeric, a spice with a long history in Eastern medicine, is known for its health benefits. Its active compound, curcumin, is a powerful anti-inflammatory agent that has been extensively studied.

Curcumin interferes with several cellular pathways related to cancer, working at multiple levels to suppress inflammation and promote the death of damaged cells. This compound has a wide range of health benefits, including protection for the liver, heart, and DNA.