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The increase in younger people may relate to excess weight and dietary issues

Recchia F, Bernal JDK, Fong DY et al (2023) Physical activity interventions to alleviate depressive symptoms in children and adolescents: a systematic review and meta-analysis

It is the difference between a treatment that works and a treatment that wastes time and money
Dynamic signaling between astrocytes and neurons
Furthermore, health risks, family history, other medications, age, and personal health factors, are also going to dictate the results you are going to see, and how quickly you can expect to see those results
