How so? Please elaborate. How's my two cups of home made brew any worse or better than one of those grande mochas from Starbucks which are loaded with tons of sugar and caffeine?
Excessive caffeine, from any source. Better if having multiple cups to make some of them decaffeinated, they still have some caffeine.
As far as those expensive Starbucks drinks it's better to never try or get hooked on those, Starbucks makes most of their profits on those.
FYI a lot of Starbucks give very cheap coffee refills-in NY the refills are only 54 cents.