Café Touba is the spiritual drink of Senegal, named after Cheikh Ahmadou Bamba Mbacké (known as Serigne Touba) and the holy city of Touba in Senegal.[61] During the roasting process, the coffee beans are mixed with grains of selim, and sometimes other spices, and ground into powder after roasting.[61] The drink is prepared using a filter, similar to plain coffee. Sugar is often added before drinking.[61]
A coffee percolator is a type of pot used to brew coffee by continually cycling the boiling or nearly-boiling brew through the grounds using gravity until the required strength is reached. There are stove-top percolators and standalone units which contain a built-in heating element. Percolators were popular until the 1970s, when they were widely replaced by drip coffee makers. By the mid-1970s, many companies ceased production of percolators.[citation needed]
A 28-year study, eventually published in 2017 in Alzheimer's and Dementia, the journal of the Alzheimer's Association, determined that four to five cups of a coffee a day – a level deemed "moderate" – led to a decreased risk of dementia during that time period. Those who drank coffee in moderate levels had less medial temporal atrophy, which is linked to Alzheimer's disease, compared to those who drank three or fewer cups a day, including those who didn't drink any.