I am looking for a less acidic caffeinated drink. Currently Sumatra is the least acidic coffee I’ve found but was wondering if espresso is better since it’s less liquid and has the same amount/more caffeine.
The acidity level of brewed coffee is mainly influenced by three factors:
Darkness of roast, with lighter roasts generally resulting in higher concentrations of acidic compounds and darker roasts resulting in lower concentrations
Grind size, with finer grinds enabling greater extraction of acidic compounds (due to greater exposed surface area) and coarser grinds preventing extraction of acidic compounds retained inside the grinds
Duration of brewing method, with shorter duration brewing methods like espresso generally producing a more acidic brew than longer duration brewing methods like drip or French press
So in general, if you want the least acidic brew you can get, opt for either drip or French press with a dark roast. French press will generally produce a less acidic cup than drip with the same batch of roasted coffee because the grind size difference is quite large.