Is this: 
the cause of this: 
According to an article on the BBC site obesity contributes to the World Food Crisis. BBC NEWS | Health | Obese blamed for the world's ills
Not only do obese people eat more, but they also cost more to transport around. So by remaining thin we are doing our bit to help feed the World!
Funny, I thought the food crisis was due to speculators and multinationals profiting from the crisis: Multinationals make billions in profit out of growing global food crisis - Green Living, Environment - The Independent
Or from poor crops around the World due to Climate Change, floods and droughts, or from increased fuel costs and fertilisers, and water shortages.
Or from increased demand and changing lifestyles in India and China (and an ever increasing World Population): Global Food Crisis: The Struggle to Satisfy China and India's Hunger - International - SPIEGEL ONLINE - News
A counter to this from India is to blame the US for eating too much, for economic (and military) policies which have caused the dollar to fall through the floor, the rush to grow bio fuels to help mitigate the increasing costs of oil, and for EU and US subsidies on farming (whilst the World Bank and IMF force many countries to grow cash crops instead of feeding their own people A Backgrounder on the Food Crisis: Misery is Profitable ยป Celsias) Indians Find U.S. at Fault in Food Cost - New York Times
Disclaimer:- This post is not meant to be political, make anyone think about anything, or take up anyone's valuable time
O London, see
Swelling with naval pride, the pride of thee!
Wide, deep, unsullied Thames, meandering glides,
and bears thy wealth on mild majestic tides.