Scientists find key brain nutrient from everyday foods lacking in people with anxiety

Millions of Americans battle chronic anxiety — but new research claiming a missing brain nutrient may be partly to blame is already drawing skepticism from experts who say the findings are far from conclusive.

Using a non-invasive MRI-based technique that measures brain chemicals, researchers at UC Davis Health in California looked at data from 25 previous studies, comparing 370 people with anxiety disorders to 342 without anxiety.