Some argue that the tradition has its roots
in cultural construct, not biological investigation:
The three-meals model is a fairly recent convention, which is now being eclipsed as, like everything else, eating becomes a highly personalized matter of choice. What and when and how frequently we eat is driven less and less by the choices of our families, coworkers and others, and more and more by impulse, personal taste and favorite nutrition memes, and marketing schemes such as Taco Bell's promotion of late-night eating known as "Fourthmeal: the Meal Between Dinner & Breakfast." Selecting how and when we eat is like loading our iPods.
A torrent of new studies explores the health effects of eating three squares. Their findings are far from conclusive. A US Department of Agriculture study found that eating just one large meal a day versus three normal-sized meals lowers weight and body fat but raises blood pressure; three meals per day lowers blood pressure. A National Institute on Aging study found that eating one large meal a day rather than three raises insulin resistance and glucose intolerance: two key features of type-2 diabetes.
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