In a word — less.
More and more people, young and old, in countries rich and poor, are fat and growing ever fatter. If there are limits to obesity, our species seems not to know about them.
Grady, Denise. “(8) What Should We Eat?” <em>The New York Times</em>. November 11, 2003. <a href="http://www.nytimes.com/2003/11/11/science/11EAT.html?ex=1383886800&en=a35c25aa51dc0f60&ei=5007&partner=USERLAND" title="(8) What Should We Eat?"><http://www.nytimes.com/2003/11/11/science/11EAT.html></a> (17 November 2003).