As noted here, numerous studies have highlighted the potential health benefits of caffeine. Meanwhile, centuries of caffeine consumption and extensive study of the ingredient further reinforce its safety. In other words, the billions of people who routinely consume caffeine can continue to do so with confidence and the knowledge that the ingredient may even enhance health.
4. Place the plunger lid back on top of the pot. Once the plunger is in place mix it around a bit as this will stop the grounds from settling in one place at the top of the jar and then after a minute or so you can then press the plunger down. However there are some coffee connoisseurs who actually prefer to press the plunger down as soon as they place the lid on. But the decision is yours as to when this happens.
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.