Greg Battaglia is a member of the HumanaNatura community and has written a very interesting article about eating once a day. Below is a snippet, and be sure to check out the link below it to read the rest of the article.

When viewing meal frequency through an evolutionary scope, one can easily conclude that humans certainly did not evolve to consume food very frequently. In nature there is no absolute guarantee that food will be available or when it will be available. It is likely that humans would have been subjected to many hours or even days without food throughout the entirety of our evolution. It is also likely that when food did become available, for example, after a vigorous but successful hunt, that our ancestors would have consumed a large quantity of calories to make up for the deficit created during the fast. Once a kill and any gatherings were completely eaten, the fast would then begin once again and this cycle might continue as the basic template for a typical hunter-gatherer (H/G) eating pattern.

Read the article here: http://www.humananatura.org/viewarticle.php?article=168