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Why older adults should avoid junk food

A new study suggests it could hurt your memory

Updated:

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Mark Huffman
Reporter

Mark Huffman has covered consumer issues since 2004, with a special focus on protecting and empowering older adults. A former news correspondent for the Associated Press Radio Network, Westwood One, and ConsumerAffairs, Mark brings decades of journalistic experience to RetirementLiving.com. He is passionate about giving consumers a voice and helping them make informed decisions. Mark has also created educational content, including Senior Scam Alert, a video resource designed to help seniors recognize and avoid fraud. He holds a B.A. from the University of Kentucky and lives with his family in Richmond, Virginia.
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Photo by Di Weng on Unsplash

Key Insights

  • UNC researchers find heavy junk food diets can harm memory and attention.
  • Sugary drinks, salty snacks, and fast food linked to measurable cognitive decline.
  • Experts say small swaps in daily diet could help protect long-term brain health.

If you’ve been reaching for chips, soda, or fast food a little too often, your brain may be paying the price. 

A new study from the University of North Carolina suggests that eating large amounts of junk food isn’t just bad for your waistline,  it may also hurt your memory.

Researchers tracked thousands of adults over several years, comparing their eating habits with performance on memory and learning tests. People who frequently ate highly processed foods and sugary drinks scored lower on tasks measuring attention, recall, and short-term memory.

The effect showed up in both younger and middle-aged adults — not just seniors. That means memory problems tied to diet could start earlier than many people expect.

Why junk food impacts the brain

Experts point to inflammation, blood sugar spikes, and poor circulation as possible culprits. Foods high in sugar, salt, and unhealthy fats can disrupt how the brain processes energy. Over time, that can make it harder to focus, learn new information, or remember details.

“The same foods that damage your heart can also damage your brain,” said lead researcher Dr. Laura Benton.

The research adds another layer of concern to America’s love affair with fast food and processed snacks. Memory issues may seem like a far-off problem, but experts warn that poor diet habits now could raise risks for conditions like dementia later in life.

The good news? Even small steps can help. Nutritionists recommend:

  • Swapping soda for water or unsweetened tea
  • Choosing fruit or nuts over chips and candy
  • Including more whole grains and vegetables in meals

Junk food may be convenient, but the trade-off could be your memory. Making healthier choices today may not only protect your physical health — it could help keep your mind sharp in the years to come.