Caffeine has positive cognitive and physiological effects at moderate doses.
What About the Caffeine?
Doctor's Note
The “coffee may reduce cancer risk” is a reference to Coffee and Cancer. There are additional cognitive benefits afforded by the phytonutrient theanine in green tea; see Dietary Brain Wave Alteration. Note that the caffeine and pregnancy study is publicly accessible, so you can download it by clicking on the link in the Sources Cited section, above.
Also, check out my associated blog posts for more context: Coffee Caveats; Is Caffeinated Tea Really Dehydrating?; and Treating Parkinson’s Disease with Diet.
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