caffeine Research & information: general 9 Biology, life sciences 6 Food & society 5 depression 4 flavonoids 4 nutrition 4 tea 4 aging 3 antioxidant activity 3 antioxidants 3 anxiety 3 behavior 3 children 3 coffee 3 diet 3 epidemiology 3 exercise 3 meta-analysis 3 polyphenols 3 resistance training 3 sport 3 GABA 2 HPLC 2 HPLC-DAD 2 HS-SPME/GC-MS 2 MRI 2 PCA 2 Psychology 2 Technology: general issues 2