FIBER It Does a Body Good
Fiber and Cancer Prevention: Why It Matters
Should you be eating more fiber to help prevent cancer? And how much do you really need to reduce your risk?
It could be time for a fiber tune-up of your diet. Most American adults get only half the recommended daily dose, according to the Centers for Disease Control and Prevention (CDC).
Clinical dietitian-nutritionist Cara Anselmo, MS, RDN, is an expert in breast cancer nutrition and is a certified specialist in obesity and weight management.
“Eating more fiber is often overlooked as one of the healthiest things we can do for ourselves,” Anselmo says.
Fiber not only improves heart health, reduces diabetes risk, and aids in weight control, it may reduce the risk of several common cancers such as colorectal cancer.
How Does Fiber Reduce the Risk of Colorectal Cancer?
Dietary fiber has long been linked to a lower risk of certain types of cancer, particularly colorectal cancer. Colon cancer rates are increasing among young adults. Because less than 10% of adults are getting enough fiber, scientists think this trend may be connected.
One of the main ways that fiber helps to protect against colon cancer, according to Anselmo, is by fostering a healthy population of bacteria in the colon, known as the microbiome. Fiber remains in the colon after other components of the diet become absorbed by the body.
“When fiber is fermented by the bacteria in our colon,” Anselmo says, “it produces metabolites, which reduce inflammation and protect the colon cells from becoming cancerous. These metabolites can also activate our immune system and increase anti-cancer immunity.”
Fiber also has several other effects that improve our metabolic health, which indirectly lowers the risk of several cancers. For example, fiber can increase the speed at which food passes through the gut, which can lower absorption and exposure time to less healthy foods we may have consumed. Fiber can also lower cholesterol levels.
What Is a High-Fiber Diet?
A high-fiber diet means you eat foods that are rich in this type of carbohydrate, found mainly in plant foods such as fruits, vegetables, whole grains, beans, peas, and legumes. Consuming more than 25 to 30 grams of fiber per day is generally considered to be a high-fiber diet.
What Are the Kinds of Fiber?
There are two main types of dietary fiber — soluble and insoluble. Both types of fiber are healthy and can lower cancer risk.
Soluble fiber attracts water into the intestines and becomes a gel. It can help lower blood sugar and cholesterol levels. Foods higher in soluble fiber include:
• Oats
• Beans
• Citrus fruits
• Peas
Insoluble fiber doesn’t dissolve in water. It can help move food through your digestive system, absorb water to provide bulk, and may help prevent constipation. Foods higher in insoluble fiber include:
• Whole grains
• Some vegetables
• Nuts and seeds
How Much Fiber Do You Need?
The MSK registered dietitian-nutritionist team recommends that most people eat 25 grams of fiber per day. “Consume half of your fiber from whole foods like whole grains, vegetables, and beans,” Anselmo advises. “Fiber-supplemented products are not as effective as whole foods and may not have additional nutrients that help you reach your optimal health.”
Anselmo also stresses the importance of staying well hydrated when increasing dietary fiber in order to minimize potential symptoms such as bloating and abdominal discomfort as your gastrointestinal tract adapts to new changes. She reminds patients to always ask their cancer care team if they should follow any special diet before, during, or after treatment.
How Is MSK Researching the Role of Fiber and Cancer?
Studies are underway to help determine a person’s optimal dose of fiber to prevent cancer, based on their biology, genetics, and lifestyle.
MSK is also investigating which bacteria are involved in fermenting fiber into the metabolites that protect against various cancers, including breast, skin, prostate, colon, and rectal cancer. If scientists can identify a specific bacterial signature, other interventions such as bacterial transplants may work to reduce cancer risks.
Finally, there are ongoing studies testing whether fiber intake and certain probiotic compounds might enhance the effectiveness of chemotherapy and immunotherapy. (Source: Memorial Sloan Kettering News- 2025, Issue 1)
Resources for Living With Stage 4 Cancer
Learn more about topics like fiber and cancer prevention, along with other important aspects of living with Stage 4 cancer. Become a member of our community to receive inspiring stories, helpful resources, and updates on how we support individuals and families facing advanced-stage cancer. Stay informed with the latest research and gain early access to educational content.
Boosting Cancer Immunity Through Fasting
Fasting and Cancer Immunity Explained
How Fasting May Supercharge the Immune System to Better Fight Cancer…
More than a dozen types of cancer are sensitive to obesity, which can cause inflammation that damages cells, increased hormone levels, and other changes. So it makes sense for researchers to explore whether fasting to slow body fat and improve metabolic health might improve outcomes.
Now laboratory researchers at Memorial Sloan Kettering Cancer Center (MSK) and their collaborators have found that fasting can SUPERCHARGE the immune system’s “natural killer” cells. (Natural killer cells, or NK cells, for short, are a type of white blood cell that can kill abnormal or damaged cells, such as cancer cells.)
Fasting can reprogram the metabolism of natural killer cells, the team found in a study of mice. Those reprogrammed cells are better able to survive in the harsh environment in and around tumors. Their cancer-fighting ability is stronger, too.
The research, which was published in Immunity — one of the top immunology journals — explains how natural killer cells get reprogrammed during periods of fasting. The researchers are optimistic that what they’re learning in animal models could help make human immunotherapies more effective in people.
“Tumors are very hungry,” says immunologist Joseph Sun, PhD, the study’s senior author. “They use up the essential nutrients flowing to normal tissue. In that nutrient-starved environment, it is harder for natural killer cells to survive, so their function is impaired. Fasting reprograms these natural killer cells to better survive in this suppressive environment.”
What Are Natural Killer Cells?
Natural killer cells get their name because they can destroy a threat without having to recognize that threat — unlike other immune cells, called T cells, which require exposure to a specific threat in order to target it.
In general, the more NK cells that are present within a tumor, the better the prognosis is for the patient.
How Fasting Reprograms and Redistributes NK Cells
For the study, mice with cancer were fasted for 24 hours twice a week and then allowed to eat freely in between fasts. While the mice did not lose weight, the fasting had a profound effect on their natural killer immune cells.
Just as happens in humans, fasted mice saw a drop in their glucose levels and a rise in free fatty acids, which are lipids released by fat cells.
“During each of these fasting cycles, NK cells learned to use these fatty acids as an alternative fuel source to glucose,” says study first author Rebecca Delconte, PhD, a postdoctoral fellow in the Sun Lab. “This really improves their response against cancer and helps them survive in the harsh environment around the tumor.”
Fasting also led NK cells to travel to and interact with different parts of the body in big numbers. Many of the NK cells travel into the bone marrow, where they are programmed to develop a more powerful response against cancer. Meanwhile, NK cells that travel to the spleen undergo a separate reprogramming, making them better able to use lipids as a fuel source.
“With both of these mechanisms put together, we find that NK cells will move to the tumor and be primed to better kill the cancer cells,” Dr. Delconte says. “They’re more able to survive in this harsh environment, and their power is strengthened against cancer cells.”
Potential To Improve Cancer Treatments
There are several potential opportunities to advance the mouse-model research toward treating patients in the clinic, the researchers say.
First, clinical trials are already beginning to study the safety and effectiveness of fasting in combination with standard treatments. Another avenue would be to identify drugs that could mimic the underlying mechanisms without requiring patients to fast. Third, small molecules might be able to be put into a pill and taken outside of the body and then administered back to patients to improve treatment effects.
Right now, however, more clinical data is still needed about the effects of fasting for people with cancer, MSK researchers say.
There are many different types of fasting, and some might be helpful while others might be harmful. Patients should speak with their doctors about what’s safe and healthy for their individual situation. (Source: Memorial Sloan Kettering News- 2025, Issue 1)
Resources for Living With Stage 4 Cancer
Learn more about topics like fasting and cancer immunity, along with other important aspects of living with Stage 4 cancer. Become a member of our community to receive inspiring stories, helpful resources, and updates on how we support individuals and families facing advanced-stage cancer. Stay informed with the latest research and gain early access to educational content.
Living Well with Stage 4 Cancer: Stories of Hope
A stage 4 cancer diagnosis, where cancer has spread beyond the original site, can be frightening. But thanks to advances in treatments and supportive care, many people are living longer and maintaining a good quality of life. At Memorial Sloan Kettering, patients like LaDawn Jefferson, Dennis Flaherty, and Antonio Lekhrajmal have beaten the odds—returning to activities they love, from running marathons to creating art while managing their disease with personalized care.
Others, like Jacqueline Hickey, have found relief from symptoms such as pain through coordinated treatments that address metastatic cancer’s challenges. These stories show that with the right care and new therapies, people with advanced cancer can continue to live fully and find hope even in difficult times. (Source: Memorial Sloan Kettering)
Precision Cancer Testing Brings New Hope
At Memorial Sloan Kettering’s Center for Molecular Oncology, doctors use advanced testing to find the exact changes in a person’s cancer cells. This helps them choose treatments that specifically target those changes, giving patients a better chance at controlling their cancer. Over the past decade, tests like MSK-IMPACT® have made it possible to check for hundreds of genetic changes, even through simple blood tests, helping people with advanced or rare cancers find personalized therapies. But DNA testing doesn’t show everything, so new tests that look at how cancer cells use genes (called RNA tests) and even check all of a person’s genes (whole-genome sequencing) are coming soon. These tools aim to help patients who don’t respond to current treatments and could also guide immunotherapy, which uses the body’s immune system to fight cancer.
This kind of testing can also find inherited gene changes that increase cancer risk, helping families take steps to prevent cancer early. One inspiring example is patient Michael Wolff, a jazz pianist whose rare cancer was identified through molecular testing. Doctors found a gene mutation that led to a drug treatment which quickly stopped his symptoms and shrank his tumors. His success shows how precise testing can save lives and open the door to new treatments for cancers that were once very hard to treat. For patients with stage 4 or difficult cancers, these advances mean more hope for better, tailored care—and the chance for improved quality of life. (Source: Memorial Sloan Kettering)
Cancer Vaccines Offer New Hope
Cancer vaccines, once considered a distant dream, are becoming a hopeful reality thanks to groundbreaking research inspired by the success of COVID-19 mRNA vaccines. Unlike traditional vaccines designed to prevent illnesses, therapeutic cancer vaccines teach the body’s own immune system how to recognize and attack cancer cells. Memorial Sloan Kettering (MSK) researchers, building on ideas first imagined over a century ago, have significantly advanced these vaccines. Dr. David Scheinberg, a leading researcher at MSK, explains that new technologies now allow vaccines to target multiple proteins specific to cancer cells, making treatments more effective and reducing side effects compared to chemotherapy and radiation.
One promising area is personalized mRNA cancer vaccines, custom-made for each patient based on their tumor’s unique characteristics. Early trials, particularly in pancreatic cancer, have shown encouraging results, with vaccinated patients’ immune cells remaining active for years. Additionally, MSK researchers are developing off-the-shelf vaccines targeting common cancer markers, such as WT1, found in leukemia and ovarian cancer. These vaccines could soon offer accessible, affordable options for many patients. The rapid progress in cancer vaccine development at MSK offers genuine optimism, especially for patients fighting advanced or hard-to-treat cancers. (Source: Memorial Sloan Kettering)
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Targeted Therapies Bring New Hope in Lung Cancer
Recent advancements in lung cancer treatment are offering new hope, especially for those with advanced or hard-to-treat cases. Scientists are developing highly targeted drugs that focus on the unique features of each person’s cancer. These treatments aim to attack only the cancer cells—sparing healthy ones—and may reduce side effects while helping patients live longer. New tools like antibody-drug conjugates (ADCs) and bispecific antibodies are leading the way, with some early results showing success even in cases where standard chemo and immunotherapy haven’t worked well.
Some of these new drugs target specific proteins found in certain lung cancers, including those seen in both non-small cell (NSCLC) and small cell lung cancer (SCLC). Researchers are also exploring ways to combine immune-based therapies with these new targeted drugs to overcome resistance and keep the cancer from returning. While many of these treatments are still in early testing, they represent a major step toward more personalized—and more hopeful—options for lung cancer patients. (Source: Drug Target Review)
New AI Improves Lung Cancer Treatment
A new type of artificial intelligence (AI) called Deep-IO could help doctors predict whether immunotherapy will work for patients with advanced lung cancer. Immunotherapy is a treatment that helps the body’s immune system fight cancer. But right now, doctors have a hard time knowing which patients will actually benefit from it.
Deep-IO works by analyzing images of tumor samples—like the ones doctors routinely collect during biopsies. The AI accurately predicted treatment success better than current methods, meaning patients could avoid treatments unlikely to help them, reducing unwanted side effects and stress.
This technology could soon help doctors create more personalized treatment plans. Future studies will look at combining AI predictions with other tests, potentially improving patient outcomes even more.(Source: Physician’s Weekly)
MMRd Cancers Respond to Immunotherapy
A new immunotherapy-only approach is offering real hope to people with early-stage cancers that have a specific genetic mutation called mismatch repair-deficiency (MMRd). In a large clinical trial, nearly 80% of patients with rectal, colon, stomach, esophageal, and other MMRd cancers were successfully treated using immunotherapy alone — with no need for surgery, chemotherapy, or radiation. For rectal cancer patients, the response rate was 100%. This treatment uses a type of immunotherapy called a checkpoint inhibitor, which helps the immune system recognize and destroy cancer cells. It’s a major shift in care, especially for cancers that typically require organ removal or harsh treatments.
Why does this matter? For many patients, standard treatments like surgery and radiation can lead to permanent changes in bowel, urinary, or sexual function — or even infertility. This new strategy preserves quality of life and may especially help those with Lynch syndrome, a condition that increases cancer risk but often responds poorly to chemotherapy. Importantly, the FDA has granted breakthrough status to the immunotherapy drug used, Jemperli (dostarlimab), based on these promising results. As research continues, doctors hope to extend this approach to more cancer types, beyond those with MMRd. (Source: Memorial Sloan Kettering)
