human 145 Humans 95 Article 85 female 83 male 78 adult 68 controlled study 58 article 57 Female 48 Male 42 United States 37 major clinical study 37 nonhuman 37 COVID-19 31 child 31 Animals 30 food security 30 Food supply 29 animal 26 Adult 24 China 24 feeding behavior 24 chemistry 23 food 23 adolescent 22 Child 20 Diet 20 diet 20 human experiment 20 middle aged 20