This “Forbidden” Food Can Save Your Memory

Saturated fat has been a big “no no” for heart health nuts for many decades now. Instead, you’ve been encouraged to stomach “low-fat” or “no fat” foods in the name of artery health. But is forgoing saturated fat really good for you?

There’s been a dramatic shift in thinking among scientists as many no longer point to saturated fats as the main culprit behind heart disease -- something we’ve been pressing home for years.

This news begs another question…

Since what’s “bad” for the heart is also considered “bad” for the brain, is saturated fat being wrongly implicated as a cause of cognitive impairment, too?

The latest research suggests your memory has nothing to fear from fat. Here’s the story…

Key Takeaways

• Saturated fatty acids increase in the brain during memory formation and may support neuron communication.

• Researchers identified specific proteins involved in producing these fats during learning and memory processes.

• Not all saturated fats behave the same; whole-food sources may affect brain health differently than processed foods.

The Brain May Need More of This “Bad” Fat Than Anyone Realized

U.S. dietary guidelines advise limiting consumption of saturated fats to no more than ten percent of total calories, but a growing number of researchers now question whether all saturated fats deserve the same bad reputation — especially those found in whole, minimally processed foods. In fact, scientists from the University of Texas, UC San Francisco, UC Berkeley, Tufts, and colleagues from Canada and Europe are highly critical of this recommendation. It all started with your heart health...

Saturated Fat’s Link to Heart Disease Not Supported

In 2021, these scientists wrote that the link between saturated fat and heart disease, which hasn’t changed since 1990, wasn’t supported by rigorous scientific studies. They pointed to multiple systematic reviews that find no association between saturated fats and cardiovascular disease. They went on to say that important papers that don’t support this view should be excluded from consideration by the medical authorities tasked with establishing guidelines for the public to follow. That hasn't entirely happened, and now there's more to the story when researchers turned their attention to the brain...

The link between saturated fat and cognitive decline was reported more recently, but here, too, it’s being questioned by scientists. This time at the Queensland Brain Institute (QBI) in Australia. Their work shows that saturated fats, far from being harmful, are key players in forming memories.

Saturated Fats Increase As Memories Are Formed

Traditionally, polyunsaturated fatty acids are considered beneficial for learning and memory, but in their study published in 2021, the Australian scientists found, much to their surprise, that saturated fatty acid levels increase in the brains of rats when memories are formed. However, when a drug is used to block learning and memory formation, saturated fat levels don’t change.

First author Tristan Wallis explained, saying, “We tested the most common fatty acids to see how their levels changed as new memories were formed in the brain. Unexpectedly, the changes of saturated fat levels in the brain cells were the most marked, especially that of myristic acid, which is found in coconut oil and butter.

“Fatty acids are the building blocks of lipids or fats and are vital for communication between nerve cells because they help synaptic vesicles — microscopic sacs containing neurotransmitters — to fuse with the cell membrane and pass messages between the cells.”

He and his colleagues found the amygdala — the part of the brain involved in forming new memories specifically related to fear and strong emotions — contained the highest concentration of saturated fats.

One of the research team, Pankaj Sah, added that the team’s work opens a new avenue on how memory is formed. “This research has huge implications on our understanding of synaptic plasticity — the change that occurs at the junctions between neurons that allow them to communicate, learn, and build memories.”

Having discovered that saturated fats increase in memory formation, their next task was to find out the mechanism by which this occurs.

PLA1 and STXBP1 - Two Key Proteins

They discovered an enzyme called Phospholipase A1 (PLA1) interacts with another protein at the synapse called STXBP1 to form saturated fatty acids. STXBP1 controls the targeting of PLA1, coordinates the release of fatty acids, and directs communication at synapses in the brain. Mutations in the PLA1 and the STXBP1 genes are known to reduce free fatty acid levels and promote neurological disorders in humans.

Professor Frederic Meunier, who runs the QBI, explains how they made their discovery. “To determine the importance of free fatty acids in memory formation, we used mouse models where the PLA1 gene is removed. We tracked the onset and progression of neurological and cognitive decline throughout their lives. We saw that even before their memories became impaired, their saturated free fatty acid levels were significantly lower than control mice. 

Then, in a 2024 follow-up study published in The EMBO Journal, researchers confirmed their earlier findings that PLA1 and STXBP1 help generate saturated fatty acids during communication between brain cells. The findings suggest these fats may play an active role in synaptic plasticity — the brain’s ability to strengthen connections between neurons as we learn and form memories.

Even more exciting, Professor Meunier reports, “Our findings indicate that manipulating this memory acquisition pathway has exciting potential as a treatment for neurodegenerative diseases, such as Alzheimer’s.”

What Does This Mean For You?

The body uses saturated fats as building blocks for cell membranes, as a source of energy, to speed nerve impulses, and more.

Fats are especially important for the brain. In fact, the brain is the fattiest organ in the body, being 60 percent fat. There are different types of saturated fats based on the length of their carbon chains, and each type has distinct functions.

Scientists are increasingly distinguishing between saturated fats found in whole, minimally processed foods — such as yogurt, cheese, grass-fed dairy, coconut, and nuts — and the heavily processed fats commonly found in fast food and ultra-processed snacks. 

Dr. Daniel Li from the University of Minnesota explained it this way: “Usually, people think that saturated fatty acids are bad for your health, that’s why people avoid fats and have concerns about saturated fatty acids. But our study actually shows that those very long-chain saturated fatty acids are good for cognitive function.”

The study performed with colleagues at Harvard, Johns Hopkins, the Mayo Clinic, and others, followed 3,229 participants for 20 years. They found that very long-chain fatty acids, found in beef, dairy products, and nuts, slow cognitive decline. (Keep in mind that organic options are always the best.)

A recent study of 883 Italians aged 50 and older showed that other lengths are also beneficial. Individuals with a higher intake of short-chain fatty acids found in foods produced by bacterial fermentation, such as yogurt, cheese, and butter, and medium-chain fatty acids, especially lauric acid, found in coconut oil, were less likely to have cognitive impairment. They also found that higher total saturated fat intake was associated with less cognitive decline.

Eat a Balanced, Nutrient-Dense, Whole-Food Diet with Minimal Processed Foods 

Rather than fearing every source of saturated fat, many experts now recommend focusing on a balanced, nutrient-dense diet built around whole foods that support both brain and metabolic health. 

This includes healthy proteins, omega-3 fats, fiber-rich vegetables, fermented foods, olive oil, nuts, and moderate amounts of natural saturated fats from quality sources. At the same time, limiting highly processed foods, excess sugar, and inflammatory seed-oil-heavy junk foods may be just as important for protecting memory and long-term cognitive function as the amount of saturated fat itself.

Summary

Emerging research is challenging the long-standing belief that all saturated fats are harmful to the brain and heart. Scientists have discovered that saturated fatty acids increase during memory formation and may play a critical role in synaptic communication and cognitive function. New studies suggest certain saturated fats from whole foods like dairy and coconut may support brain health, while researchers continue exploring how these fats influence memory, aging, and neurodegenerative disease risk.

Frequently Asked Questions

Can saturated fat really help memory?

New research suggests certain saturated fatty acids may play an important role in memory formation and communication between brain cells.

Does this mean saturated fat is healthy?

The research is more nuanced than that. Scientists now believe different saturated fats — and the foods they come from — may affect health differently.

Which saturated fats appear most beneficial?

Studies have focused on very-long-chain saturated fats from dairy, as well as medium-chain fats like lauric acid found in coconut oil.

Should people ignore dietary guidelines about saturated fat?

Most experts still recommend moderation, but growing evidence suggests whole-food sources of saturated fat may not deserve the same concerns as ultra-processed foods.

How does fat affect the brain?

The brain is nearly 60% fat and relies on fatty acids to build cell membranes, support neuron signaling, and maintain cognitive function.