Symptoms of a choline deficiency may possibly include: 1  low energy levels of fatigue. 2  memory loss. 3  cognitive decline. 4  learning disabilities. 5  muscle aches. 6  nerve damage. 7  mood changes or disorders.
Black teas are fully oxidized teas. Black teas brew a liquor from reddish brown to dark brown. They are the most popular type of tea in the Western world. Black teas range from 40 â 60 milligrams of caffeine per 8 oz cup.
A 2009 study comparing one sample of white, green, black, oolong, and yellow tea found the white tea to be highest in caffeine; the study used white peony tea, a typical example of white tea.[5] Further sources for studies of caffeine content of specific teas can be found on our article on tea and caffeine.