Consuming fewer calories can benefit you in a number of ways -- it can slow down ageing and keep at bay cancer and type 2 diabetes that it brings in its wake.
http://ummid.com/news/2011/November/02.11.2011/protection_frm_diabetes.htm
http://ummid.com/news/2011/November/02.11.2011/protection_frm_diabetes.htm