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Glyphosate: A common weedkiller may induce anxiety by disrupting gut bacteria. Researchers observed that rats drinking the chemical developed hypervigilance toward harmless objects and sounds. This altered behavior was accompanied by abnormal changes in a specific dread-inducing region of the brain.

A new study in rats suggests a lack of fiber in the diet is linked to memory problems in the aged brain, and points to the amygdala – the small structure governing emotional memories, especially related to bad experiences – as a brain region that’s particularly sensitive to highly processed foods.

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