A new study reveals that this 1 factor raises the risk of memory loss in older adults.

Loneliness poses a greater risk to memory loss than being alone, according to a new study.

Four groups of adults were followed by researchers at the University of Waterloo over a six-year period to investigate the impact of loneliness and social isolation on memory loss. The participant categories included those who were both socially isolated and lonely, only socially isolated, only lonely, and neither.

Individuals who experienced social isolation and loneliness had the most significant decline in memory. However, loneliness had a greater impact on memory than social isolation alone.

It's equally important to stay mentally active, regardless of whether you have social connections or not, as research shows that social connections keep you sharp and happy as you age.

How to keep your brain sharp and healthy

"The wiring of brains is never fully completed," stated Dr. Lisa Feldman Barrett, a psychologist and neuroscientist, during her "The Science of Aging Smarter" class.

Your brain's ability to change its neural connections, known as plasticity, persists throughout your life, allowing you to acquire new skills at any time.

One way to improve your brain plasticity is to try new things.

""When you encounter something unexpected and potentially useful, your brain will try to learn it, as learning is plasticity," Barrett stated."

Engaging in activities such as traveling, mastering a new language, or reading a book can enhance your brain health.

Dr. Wendy Suzuki, a neuroscientist and dean of the New York University College of Arts and Science, stated that physical activity can promote the growth of brain cells, as reported by CNBC Make It.

"Activities that require strategy will engage your prefrontal cortex more," she stated.

Having stimulating social connections can enhance brain plasticity, as well.

"Although these activities are currently demanding on your metabolism, they're a worthwhile investment for a healthier and stronger future, according to Barret."

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