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Re:Drinking strong coffee before exercising increases fat-bu... by httpsterio on Sunday March 28, 2021 @04:58PM (#26614489)
there's also an approximate 30% difference in caffeine between Arabica beans and robusta beans, the latter having more caffeine.

Starbucks use Arabica, typically Italian or French espresso based drinks ha e been made with robusta or an Arabica robusta blend.

Starbucks coffee is not higher in caffeine compared to other cafés, it can actually be lower. The only sig ificant difference is portion sizes, like you mentioned.

Re:Drinking strong coffee before exercising increases fat-bu... by rolleiflex on Monday March 29, 2021 @12:44AM (#26617779)
My understanding is that almost no one drinks 100% Robusta, since it tastes something between burnt tire, wood (not in a good way, in a 'trying to bite raw timber' kind of way) and rubber. However it's very commonly used as, in a positive interpretation, to accentuate the taste of Arabica since it produces more 'crema' on espresso, and in a negative interpretation, as an adulterant to make coffee cheaper to produce.

Here are some people writing about their experience of drinking 100% Robusta: https://old.reddit.com/r/Coffee/comments/6u2ef4/100_robusta_...