I was reading this Metafilter thread on tea and I came across this MedALERT synopsis of a patient who ran into problems from drinkng too much Earl Grey:
A man aged 44 years reported muscle cramps to his doctor. He had consumed up to four litres of black tea daily for 25 years and had recently switched to Earl Grey tea, believing it would be less harmful to his stomach. Within a week, he developed muscle cramps and other unusual symptoms, including a feeling of pressure in his eyes. He also had blurred vision, particularly in darkness. After five months, the patient switched from Earl Grey back to pure black tea and his symptoms completely disappeared within a week. […] He also found they did not recur as long as he consumed no more than one litre of Earl Grey tea daily. [emphasis mine]
As an Earl Grey drinker, I’m not terribly worried. After all, it’s not likely that I’d be drinking over a liter a day. Checking the online unit converter, I see that a liter would be about 34 fl oz. Let’s see… At maybe 8 oz per glass, I could have four full glasses of Earl Grey. Hmm, yeah, I should be able to make that ;).