Pillows said:

Darker roasts do have less caffeine than lighter roasts because the higher and longer exposure to temperatures in the roasting process does harm caffeine molecules. You may also want to try drinking just regular coffee, rather than shots of espresso. Although espresso has more caffeine by volume, the large Starbucks coffee has more caffeine than in four shots of espresso. (It's a heck of a lot cheaper too.) You can find caffeine content of their drinks online.

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Pillows said:

Darker roasts do have less caffeine than lighter roasts because the higher and longer exposure to temperatures in the roasting process does harm caffeine molecules. You may also want to try drinking just regular coffee, rather than shots of espresso. Although espresso has more caffeine by volume, the large Starbucks coffee has more caffeine than in four shots of espresso. (It's a heck of a lot cheaper too.) You can find caffeine content of their drinks online.

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Quote:

During coffee roasting process, several substances may be formed or eliminated. The influence of roasting on polycyclic aromatic hydrocarbons (PAHs), caffeoylquinic acids (CQAs) and caffeine levels was studied in Coffea arabica cv. Catuaí Amarelo IAC-62 and Coffea canephora cv. Apoatã IAC-2258, roasted in three roasting degrees. CQAs and caffeine were determined simultaneously by HPLC-DAD, and PAHs by HPLC-FLD. Caffeine levels were higher in canephora (1486–1884 mg per 100 g) than in arabica (1110–1255 mg per 100 g) and increased up to 21% at darker roasts. Summed CQA levels were higher in green coffee (4661 and 4946 mg per 100 g) and decreased at darker roasts (234 and 377 mg per 100 g), showing no difference between the coffee cultivars studied. PAH summed levels varied from 0.052 to 0.814 μg kg−1 (arabica) and 0.108 to 0.392 μg kg−1 (canephora). No correlation was observed between roasting degree, coffee cultivar and PAH levels. Results were also analysed using hierarchical cluster analysis and principal component analysis.

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Here is another study about the effects of roasting temperature on caffeine, but it is just too long to copy and paste.

occollegeboi said:

I can have like, 4 shots of their espresso and then take a nap. Yet, if I get one or two shots from the coffee bean and tea leaf (or a REAL coffeehouse) then I feel like I'm kinda on crack.

Do any of you notice that starbucks barely has any cafeinne in it?

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tdubz said:

Another thing I didn't know was that darker coffee does not mean it has more caffeine like you would think....actually lighter colored blends have more caffeine.

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Patlal said:

I dont care about coffee whatsoever.

I dont drink it.

Im not a slave to coffee places

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Then why are you posting here? Just to point out how much better you are than everyone else?