A Special Diet Could Help Slow the Growth of one of the Deadliest Brain Tumors

The key to slowing deadly brain tumors could be right on our plates. Gliomas are a group of tumors that develop in the brain or spinal cord and can range from slow-growing — like the one Busy Philipps was diagnosed with this year — to highly aggressive, like the ones John McCain, Beau Biden and Sophie Kinsella had.

New research from the Feinstein Institutes for Medical Research at Northwell Health may have found a way to slow down the growth of these tumors — and it could come down to what people eat.

A study published Tuesday found that high-grade gliomas, which grow quickly when supportive cells in the brain grow and divide uncontrollably, have the same metabolic flaw as a rare genetic disorder in children known as GAMT Deficiency.

In lab studies, the special medical diet used to treat the children was tested on mice, and it dramatically slowed cancer growth in the rodents. “The diet that we are considering for this trial is not really, say, a Mediterranean diet or a ketogenic diet,” Dr. Kalil Abdullah, director for central nervous system cancer at Northwell Health’s Brain Tumor Center, said. “It’s a diet under medical supervision that restricts very specific types of food.”

Thanks for posting. Did a little more digging. If I’m understanding right, there are 3 distinct diets that seem promising:

- restrict the amino acid arginine and add the amino acid ornithine

- eliminate the amino acids serine and glycine

- limit the amino acid methionine

Below are excerpts from 3 different articles, all published this year:
______________________________________________________

A special diet could help slow the growth of one of the deadliest brain tumors

... In lab studies, the special medical diet used to treat the children was tested on mice, and it dramatically slowed cancer growth in the rodents...

mice were fed a diet that restricted the amino acid arginine and added extra ornithine, another amino acid...

https://nypost.com/2026/09/15/health/a-special-diet-could-help-slow-the-growth-of-one-of-the-deadliest-brain-tumors/
______________________________________________________

Dietary Changes Could Provide a Therapeutic Avenue for Brain Cancer

Glioblastomas are the deadliest form of malignant brain tumor, and most patients diagnosed with the disease live only one or two years...

“We altered the diet in mouse models and were able to significantly slow down and block the growth of these tumors,”...

They tested whether mice that were fed an amino acid-restricted diet had better treatment outcomes...

“When we got rid of the amino acids serine and glycine in the mice, their response to radiation and chemotherapy was better and the tumors were smaller than the control mice that were fed serine,” ...

The team is working on opening clinical trials soon to test whether specialized diets that limit blood serine levels can also help glioblastoma patients...

https://animalcare.umich.edu/our-impact/dietary-changes-could-provide-a-therapeutic-avenue-for-brain-cancer/
____________________________________________________

Diet remodels chromatin structure and extends survival in models of glioma

limiting a single nutrient, the amino acid methionine, in the diet destabilized DNA organization and led to cancer cell death and increased animal survival. These findings open new possibilities for treating one of the most challenging forms of brain cancer...

“Cancer cells, including gliomas, often depend on methionine. Methionine is an essential amino acid, meaning that the body does not produce it on its own, it must consume it in the diet. Glioma cells are unusually dependent on methionine to fuel rapid growth and control gene activity,”...

“In the current study, we wanted to know, if tumors depend so much on methionine, what happens if we reduce the supply?”...

the team used a mouse model of high-grade glioma. They fed a group of mice a normal diet which includes methionine, while another group received a methionine-restricted diet. The results were striking. Mice whose diets were low in methionine lived longer and had slower-growing tumors...

https://www.bcm.edu/news/diet-remodels-chromatin-structure-and-extends-survival-in-models-of-glioma

Sounds like a tough diet to follow, but it may only be temporary...

A diet low in arginine and high in ornithine is not something ordinary meals produce on their own. Arginine is present in nearly all dietary protein. Free ornithine is scarce in food because it is not built into proteins; the body normally makes it from arginine via arginase. Reaching low arginine plus high ornithine therefore means restricting arginine-rich foods, keeping total protein modest, using arginine-free essential-amino-acid formulas when the restriction is strict, and adding L-ornithine (or L-ornithine L-aspartate) as a supplement.

This pattern appears in medical settings such as GAMT deficiency (arginine restricted, ornithine and creatine added) and in experimental work on certain gliomas that used an arginine-restricted, ornithine-supplemented amino-acid diet.

Foods that contribute the most arginine per weight, and are therefore the first to limit or avoid, include:

Nuts and seeds (peanuts, almonds, walnuts, pumpkin seeds, sesame seeds)
Chocolate and cocoa
Gelatin and bone broth
Soy products and many legumes
Some grains in large amounts (oats, wheat germ)

Relatively lower-arginine choices, still used only in limited amounts because they are not arginine-free, include most fruits (apples, pears, peaches, pineapple), many vegetables (tomatoes, lettuce, carrots, cucumbers, beets), and dairy. Dairy has a more favorable lysine-to-arginine ratio than nuts but still supplies arginine.

Red meat, poultry, and eggs are not the most arginine-dense foods by weight, which is why some lysine-ratio lists allow them. They still belong on a restriction list when the goal is low total arginine. Lean beef or chicken typically provides about 1.8–2.2 g arginine per 100 g cooked. A normal serving of steak or chicken therefore adds a large arginine load because the portion is high in protein. Whole eggs are lower per 100 g (around 0.8 g) because of fat and water, yet two or three eggs still add hundreds of milligrams; large omelets or dried egg white raise the amount further.

Clinical low-arginine protocols therefore treat all conventional high-protein foods—including red meat and eggs—as limited items. Protein intake is often kept in a modest range and most of it is replaced by arginine-free medical formulas. Small portions of meat or eggs may be used for taste, but they are not free foods. Ordinary foods do not supply meaningful free ornithine, so the “high ornithine” part comes from measured supplementation.

The resulting pattern is a low-protein selection of fruits, vegetables, and limited dairy or animal protein, plus specialized amino-acid mixtures and ornithine supplements. It is a targeted metabolic diet, usually used under medical supervision, because severe arginine restriction can affect urea-cycle function.

It seems that they want to limit arginine in the diet. I am NOT a medical or dietary professional but,

Foods to Limit or Avoid
Nuts and seeds: Avoid peanuts, walnuts, almonds, hazelnuts, sunflower seeds, and pumpkin seeds, along with nut butters.Chocolate and cocoa:
Skip chocolate treats and cocoa powder, which are very high in arginine.Legumes:
Cut back on soybeans, tofu, chickpeas, and lentils.Grains:
Limit whole grains like brown rice, oats, and wheat germ.
Meats: Moderate your intake of chicken breast, turkey, and red meat.
Foods to Eat Instead
Dairy: Choose low-fat yogurt, milk, and cheese, which generally offer a favorable ratio favoring lysine.
Fish and eggs: Eat fish like salmon or cod, and use egg whites for lean protein that is low in arginine.
Fruits and vegetables: Enjoy non-acidic fruits like apples, pears, and apricots

Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.