Undigested Fructose Linked to Anxiety in Study, Gut and Immune System Changes Suspected

A new study published in Brain, Behavior, and Immunity suggests a potential link between fructose malabsorption and anxiety. Researchers observed that when the body cannot fully absorb fructose, a simple sugar found in fruits and plants, it can lead to fermentation by gut bacteria. This process may disrupt the gut microbiome and trigger inflammatory responses.

In a study involving 55 healthy men, approximately 60% showed signs of fructose malabsorption. These individuals reported higher anxiety levels and displayed differences in inflammatory markers and gut bacteria composition compared to those who absorbed fructose normally. However, the study's authors emphasize that this indicates an association, not a direct cause-and-effect relationship.

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Anxiety is not just a mental experience, but a deeply physical one. When we perceive a threat, real or imaginary, the body activates the stress response system.

To further investigate, scientists conducted experiments on mice that had difficulty absorbing fructose. After four weeks of consuming fructose, these mice displayed increased anxiety and depression-like behaviors. They explored open spaces less and showed more fear responses than control groups. The analyses also revealed significant changes in their gut microbiomes and signs of inflammation in the brain's immune cells, suggesting that gut imbalances can indeed influence brain function.

Psychotherapist Gabriela Răileanu explained that anxiety is a deeply physical experience. The body's stress response, triggered by perceived threats, alters heart rate, breathing, muscle tension, and digestive function, potentially causing nausea, bloating, cramps, or changes in bowel movements. This digestive discomfort can, in turn, exacerbate anxiety.

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Compared to animals in the control groups, they spent less time exploring open spaces and showed more fear-specific reactions.