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Study Unveils Obesity’s Impact on Mental Health - Video

Published On 2025-06-03T08:00:22+05:30  |  Updated On 3 Jun 2025 3:06 PM IST
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Overview

A new study presented at NUTRITION 2025, the flagship annual meeting of the American Society for Nutrition, reveals a compelling link between obesity and anxiety, potentially driven by changes in the brain and gut microbiome. The research, conducted in mice, suggests that diet-induced obesity may trigger anxiety-like behavior through altered brain signaling and gut health, shedding light on how physical health may influence mental well-being.

While previous studies have hinted at a relationship, it remains unclear whether obesity causes anxiety or if both conditions are shaped by shared societal or environmental influences. “Our findings suggest that obesity can lead to anxiety-like behavior, possibly due to changes in both brain function and gut health,” said Desiree Wanders, PhD, associate professor and chair of nutrition at Georgia State University, who led the study.

To investigate this connection, researchers designed a controlled experiment using 32 male mice. From 6 to 21 weeks of age—comparable to adolescence into early adulthood in humans—half the mice were fed a low-fat diet while the others received a high-fat diet. By the study’s end, the high-fat group exhibited significantly more body fat and weight gain. Behavioral tests showed that these obese mice demonstrated more anxiety-like behaviors, such as freezing in response to perceived threats.

Further analysis revealed changes in signaling patterns in the hypothalamus, a brain region involved in metabolism, as well as distinct differences in gut microbial composition between the two groups. These findings reinforce the growing body of evidence that the gut-brain axis plays a crucial role in behavior and cognitive function.

“These findings could have important implications for both public health and personal decisions,” said Wanders, emphasizing the role of diet in mental health. However, she also noted that genetics, lifestyle, and environment must be considered to fully understand these complex interactions. Future research will examine the effects across genders, age groups, and whether interventions like weight loss can reverse the observed changes.

Reference: https://nutrition.org/meeting/

Speakers

Dr. Bhumika Maikhuri

BDS, MDS

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