Anxiety is not purely psychological. It has a neurobiological substrate — involving the HPA axis (cortisol response), the amygdala (threat detection), the prefrontal cortex (regulatory control), the vagus nerve (gut-brain communication), and neurotransmitter systems including GABA, glutamate, serotonin, and norepinephrine.
Food #1: Caffeine — beyond the obvious.
Caffeine blocks adenosine receptors and elevates cortisol and adrenaline.
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