Junk food diet triggers lasting changes in the brain – Earth.com

5 minutes, 31 seconds Read

Let’s say you’re a teenager and survive on a steady diet of cheeseburgers, pizza, chips, and soda. Sound appetizing? Maybe for right now. But what if I told you this junk food obsession could do more than make your jeans feel tight – it might also be messing with your brain, even years from now?

Researchers at the University of Southern California found that rats who spent their teenage years eating a junk food diet suffered some pretty serious memory problems.

These effects didn’t go away when they started eating healthier, suggesting there might be lasting consequences for human teens with similar diets.

“What we see not just in this paper, but in some of our other recent work, is that if these rats grew up on this junk food diet, then they have these memory impairments that don’t go away,” said Scott Kanoski, professor of Biological Sciences at USC. “If you just simply put them on a healthy diet, these effects unfortunately last well into adulthood.”

Acetylcholine: The memory messenger

Acetylcholine is a neurotransmitter, a chemical messenger that carries signals between brain cells (neurons). It plays a crucial role in several cognitive functions, including learning, attention, and memory formation.

In conditions like Alzheimer’s disease, acetylcholine levels decline significantly, leading to impaired memory and other cognitive problems.

Researchers divided rats into two groups: one group received a diet high in fat and sugar, mimicking a typical “junk food” diet, while the other group received a balanced, healthy diet.

After the rats were fed their respective diets, scientists conducted experiments, including those that tested the rats’ ability to recognize and remember objects and their placement.

Shocking results: Junk food damages brain

Rats on the junk food diet performed poorly in memory tests. They demonstrated difficulty recalling previously seen objects and their locations within a familiar environment.

Further analysis of their brains indicated disruptions in acetylcholine signaling. This suggests that the junk food diet negatively impacted the brain’s normal memory processes that rely on acetylcholine function.

Junk food and brain damage in humans

Okay, but we’re not rats, right? True. But our brains share similarities, especially during teen years when things are changing rapidly.

“Adolescence is a very sensitive period for the brain when important changes are occurring in development,” Kanoski explains. “I don’t know how to say this without sounding like Cassandra and doom and gloom, but unfortunately, some things that may be more easily reversible during adulthood are less reversible when they are occurring during childhood.”

The idea is that a super unhealthy diet could mess with your memory down the road, making it difficult to recall things like where you left your keys or even important details of past experiences.

Junk food impacts beyond brain damage

Junk food, typically high in fats, sugars, and salts, while low in essential nutrients, can cause significant and far-reaching impacts on various organs in the body. Here’s how junk food can affect different organs and systems:


Consuming high levels of saturated and trans fats found in many junk foods can increase blood cholesterol levels. This leads to the build-up of fatty deposits in the arteries, which can reduce or block blood flow. Over time, this increases the risk of heart disease, including coronary artery disease and heart attacks.

Additionally, excessive sodium intake from salty snacks and fast foods can contribute to hypertension (high blood pressure), further stressing the cardiovascular system and increasing the risk of stroke.


The liver processes most of the fat that we consume. Diets high in unhealthy fats can lead to non-alcoholic fatty liver disease (NAFLD), a condition where fat accumulates in the liver cells.

Over time, this can cause inflammation and scarring (cirrhosis), severely impairing liver function. The liver is also crucial for detoxifying harmful substances, and a diet heavy in processed foods can overwhelm this system, leading to further liver damage.


Junk food can be extremely high in sugars, including high-fructose corn syrup and other refined sugars, which can cause spikes in blood glucose levels. To manage this, the pancreas releases insulin.

However, over time, the body’s cells can become resistant to insulin, a condition known as insulin resistance, which is a precursor to type 2 diabetes. The pancreas then has to work harder to produce more insulin, which can strain it and potentially lead to pancreatic exhaustion or diabetes.


The kidneys filter waste products from the blood and regulate fluid and mineral balance in the body. High sodium levels from junk food can put stress on the kidneys by increasing blood pressure and potentially leading to kidney disease. Moreover, diets high in sugar can increase the risk of developing kidney stones, particularly uric acid stones.

Digestive System

Junk food typically lacks dietary fiber, which is essential for healthy digestion. Without sufficient fiber, individuals can suffer from constipation and other digestive disorders.

Over time, a poor diet can lead to more severe gastrointestinal issues like gastroesophageal reflux disease (GERD), where stomach acid regularly flows back into the tube connecting your mouth and stomach (esophagus), or irritable bowel syndrome (IBS), which involves recurrent digestive symptoms such as abdominal pain, diarrhea, and constipation.


Skin health can be directly affected by diet. Foods high in sugar and fat can promote inflammation throughout the body, including the skin. This can exacerbate conditions like acne and eczema.

Additionally, the lack of essential nutrients such as vitamins A, C, E, and omega-3 fatty acids in junk food can deprive the skin of the compounds it needs to prevent oxidative damage from UV rays and environmental pollutants, leading to premature aging and poor skin health.

In summary, while junk food can be tempting due to its convenience and taste, its adverse effects on various organs highlight the importance of maintaining a balanced and nutritious diet to support overall health and well-being.

Potential to reverse brain damage from junk food

To investigate potential solutions, scientists administered medications designed to increase acetylcholine levels to some of the rats exhibiting memory impairment.

These medications were effective in restoring memory function in the treated rats. However, this finding highlights a key concern: without specific pharmacological intervention, the memory damage caused by a junk food diet during adolescence may be difficult to reverse.

More research is required to fully understand the long-term consequences of such a diet and explore potential avenues for treatment. This study highlights just how powerfully food choices can impact our brains, and not just our waistlines.

Of course, enjoying your favorite foods in moderation is totally fine. But consistently opting for processed, fatty, or overly sugary stuff, especially when you’re young, might have more significant consequences than you think.

This post was originally published on 3rd party site mentioned in the title of this site

Similar Posts

    Your Cart
    Your cart is emptyReturn to Shop