depression anxiety 26 Medicine 20 mental health 20 obesity 16 aging 14 COVID-19 12 inflammation 12 exercise 11 physical activity 11 stress 11 Research & information: general 10 cognition 10 health 10 quality of life 10 Humanities 9 machine learning 9 nutrition 9 prevention 9 schizophrenia 9 Social interaction 8 children 8 diabetes 8 public health 8 systematic review 8 Parkinson's disease 7 SARS-CoV-2 7 adolescents 7 antioxidant 7 brain 7