Does Beef Fight Cancer? What the TVA Study Really Found

"BEEF FIGHTS CANCER," says an Instagram post from @meathealth. It claims a fatty acid in beef, called trans-vaccenic acid (TVA), can "STARVE cancer cells" by cutting off their energy, "without hurting healthy cells."

There is real science behind this post, and it is more interesting than the post lets on. In 2023, scientists at the University of Chicago found that TVA helped immune cells fight tumors in mice. But TVA did not starve cancer. It did not harm the cancer cells directly at all. And the scientists who found it say it is not a reason to eat more red meat.

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Our verdict: misleading. The post starts from a real lab finding, then gets the how, the who and the what-to-do wrong.

A search through 255 nutrients

The study was published in the journal Nature in November 2023. The team, led by Dr. Jing Chen, wanted to know which nutrients from food might help the immune system fight cancer.

Food is hard to study. People eat thousands of different things. So the team went small. They gathered 255 nutrients that travel in human blood, from vitamins to fats. Then they tested each one on T cells in the lab.

T cells are white blood cells that hunt down sick cells. One kind, the CD8 T cell, is a "killer" cell. It can find a cancer cell and destroy it. Many newer cancer treatments, such as immunotherapy and CAR-T therapy, work by helping these cells do their job.

Out of all 255 nutrients, TVA did the best job of switching T cells on.

What is TVA?

TVA is a natural fat found in meat and milk from grazing animals. The paper says it comes "mainly from ruminant-derived foods including beef, lamb and dairy products such as milk and butter." It is also found in human breast milk. The human body cannot make it, so all of it comes from food.

TVA is a natural trans fat. That surprises many people, since the trans fats in old-style margarine and processed foods have been linked to heart disease. In a later commentary, the study's authors wrote that natural trans fats from milk and meat may not act the same way, and that more research is needed.

What happened in the mice

Next, the team fed mice a special diet. It had pure TVA mixed in, making up 1% of the food. Other mice ate a regular lab diet.

The mice had been given cancer cells under the skin. In mice eating TVA, melanoma (a skin cancer), colon cancer and breast cancer tumors grew more slowly. One type of lung tumor did not respond. The team describes it as a tumor the immune system has a hard time noticing.

More killer T cells got inside the tumors of the TVA-fed mice. Those T cells were also more active and less worn out.

Then came the key test. The team gave TVA to mice that had no working T cells, or whose killer T cells had been removed. In those mice, TVA had little effect. That told the scientists TVA was working through the immune system.

TVA also teamed up well with immunotherapy. In mice that got both the TVA diet and an anti-PD-1 drug (a common kind of immunotherapy), the two together slowed tumors more than either one did alone.

Why "starve" is the wrong word

The post says TVA cuts off cancer cells' energy supply. The study points the other way.

When the team put TVA right next to melanoma cells in a dish, the cancer cells grew and died at the same rate as cancer cells without TVA. TVA did not hurt them directly.

The scientists also checked whether T cells were burning TVA for fuel. They were not. TVA was not acting as food or as poison.

So what was it doing? Think of a switch on the surface of killer T cells, called GPR43. Small fats made by gut bacteria normally flip this switch on, and when it is on, it works like a brake on the T cell. TVA blocks the switch. With the brake eased, the T cell becomes a stronger fighter.

When the team removed GPR43 from the killer T cells of mice, the TVA diet stopped helping. That is strong evidence for how TVA works, at least in mice.

What about people?

The study did not give TVA to any patients. It had two small human parts.

In the lab. The team tested T cells taken from people. TVA helped human T cells stay active when cancer-like signals tried to shut them down. It helped CAR-T cells made from 3 people with lymphoma grow faster in a dish, though cells from an older patient did not respond. TVA also helped a leukemia drug called blinatumomab kill leukemia cells in a dish.

In blood samples. The team looked back at stored blood from 10 people with lymphoma who had received CAR-T therapy. People whose cancer went away had higher TVA levels in their blood than people whose cancer kept growing.

That is a striking result, but it is a link, not proof. Ten people is a very small group. People with more TVA in their blood may differ in other ways too, such as overall health or diet. A link like this tells scientists what to test next. It does not show that TVA made the treatment work.

From a mouse cage to your plate

Most findings in mice never become treatments for people. A mouse eating a measured lab diet is very different from a person eating a steak.

The mice did not eat beef. They ate pure TVA. Beef has much more in it than TVA, and the study did not test what beef as a whole does to cancer.

The authors made this point themselves. In the paper, they wrote that red meat "may provide TVA," but that eating a lot of red meat has been linked to a higher risk of many cancers, including colorectal and breast cancer. So they said their work supports testing TVA as a supplement, which they called "a more targeted and efficient way than dietary changes."

The University of Chicago's news story said the same. It reported that Dr. Chen thinks the goal is to find the right amount of the nutrient itself, "not the food source." The story added that the study "shouldn't be taken as an excuse to eat more cheeseburgers and pizza."

The paper also states that Dr. Chen has patents pending on TVA and related compounds. That is common in research and does not make the results wrong. It is one more reason to wait for independent studies in people.

What WHO says about red meat

The World Health Organization's cancer agency, IARC, classifies red meat as "probably carcinogenic to humans" (Group 2A). WHO says this rests on limited evidence from studies of people that link red meat with colorectal cancer, plus strong evidence on how it could cause cancer. Processed meat, such as hot dogs, ham and sausages, is in Group 1, "carcinogenic to humans."

These groups rate how sure scientists are, not how big the risk is. WHO says the risk "increases with the amount of red or processed meat consumed." It also says meat "can be part of a healthy diet." Our story on bacon as a Group 1 carcinogen explains the 2015 decision. See also red and processed meat and is processed meat linked to cancer?.

And the sugar part?

The post also says cancer cells "feed on sugar." Every cell in your body uses sugar for energy, including healthy ones. Our page does sugar feed cancer? explains what is known.

What this means for you

TVA is a real and promising lead. It may one day be tested as a supplement alongside treatments like immunotherapy or CAR-T. That work has not been done yet. No study has shown that eating beef, or taking TVA, helps people with cancer.

The post ends by asking readers to comment "BOOK" to get a message about a book. When a bold health claim comes with something to buy or sign up for, it is worth slowing down. Our guide to spotting cancer misinformation online can help.

If you are in cancer treatment, talk with your care team or a registered dietitian before you change your diet or add a supplement. See are supplements safe during cancer treatment?

Sources

• Instagram post (@meathealth): instagram.com
• Fan H, Xia S, Xiang J, et al. "Trans-vaccenic acid reprograms CD8+ T cells and anti-tumour immunity." Nature, 2023;623:1034-1043. Full text on PubMed Central: pmc.ncbi.nlm.nih.gov
• University of Chicago Biological Sciences Division, "Nutrient found in beef and dairy improves immune response to cancer," November 2023: biologicalsciences.uchicago.edu
• Fan H, Zhang FQ, Chen J. "Rethinking nutritional villains: A trans-fatty acid identified to boost immunotherapy." Clinical and Translational Medicine, 2024;14:e1537: pmc.ncbi.nlm.nih.gov
• WHO, "Carcinogenicity of red and processed meat," questions and answers: who.int

How this article was prepared

An AI-assisted editorial system prepared this page on November 9, 2026, from the sources listed above, including the full text of the Nature paper. No named medical reviewer has reviewed it unless one is listed.

Cancer Explained is published by the National Cancer Information Foundation. It is not medical advice and does not suggest a test or treatment.

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