In irreligious/nonreligious regions, there is a significant amount of [[Alzheimer's disease]] (see: [[Irreligious/nonreligious geographic regions and Alzheimer's disease]]).
Diet, obesity, exercise, degree of alcohol consumption, various spiritual practices and various other health practices are linked to the development of Alzheimer's disease(see: [[Religion and Alzheimer's disease prevention]]).<ref>[https://www.sciencedaily.com/releases/2018/06/180628151649.htm Obesity + aging linked to Alzheimer's markers in the brain], ''Science Daily'', June 28, 2018</ref><ref>[https://www.ncbi.nlm.nih.gov/pubmed/29024348 Obesity as a risk factor for Alzheimer's disease: weighing the evidence.] by Alford S, Patel D, Perakakis N, Mantzoros CS., ''Obesity Reviews''. 2018 Feb;19(2):269-280. doi: 10.1111/obr.12629. Epub 2017 Oct 10.</ref>
== Atheism and loneliness ==