"Past research has associated obesity with increased risk of dementia. But a new study - deemed the largest ever to assess the link between body mass index and dementia risk - suggests obesity could actually be a protective factor against the condition, while people who are underweight may be at increased risk."
Being underweight increases dementia risk, while obesity reduces it, study finds Medical News Today (10 April 2015) by Honor Whiteman. http://www.medicalnewstoday.com/articles/292200.php
