A study published in the journal Neuroscience suggests that diets heavy in junk food may reduce cognitive abilities and hinder adaptation to environmental changes.
Researchers at the University of Oregon tested this on mice fed diets varying in sugar and fat levels. After four weeks, they observed a clear link between gut bacteria levels and cognitive performance. High-fat foods diminished the effectiveness of beneficial intestinal bacteria that support brain health.
University experts note that probiotic levels—key bacteria aiding immune defense—directly influence adaptability.
Kathy Magnusson, Professor at the College of Veterinary Medicine, explains: "Bacteria can release compounds that act as neurotransmitters, stimulate sensory nerves or the immune system, and affect a wide range of biological functions… Suggesting that fat and sugar alter your bacterial system… That's why these foods are not good for you."
Separately, a 2013 University of California study found women on a probiotic diet showed poor performance on cognitive tests.
