How researchers measured dementia rates in the U.S.
The researchers questioned 10,546 people living in community or nursing homes in 2000, and then questioned 10,516 respondents ― a mix of previously surveyed and new people ― again in 2012. The questionnaire included several tests that measured cognitive function. These tasks asked them to count backward from 20 or count backward from 100 in groups of seven (100, 93, 86).
They found that the 2012 group had a 24 percent relative decrease in rates of dementia symptoms compared to the 2000 group.
The 2012 group also had completed, on average, one more additional year of education compared to the 2000 group. However, the 2012 group also had higher rates of diabetes, obesity and other chronic diseases ― conditions thought to increase risk of dementia. The researchers concluded that education levels, as well as better control of chronic medical conditions that increase the risk of cardiovascular disease, may explain some of the decreased dementia risk.
Why a 20% decrease in Dementia?
Stronger immune system, less infections, health education, less use of toxic substances from drugs, medications, environmental toxins and healthy lifestyle (nutrition, social support, whole foods).