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As part of a week-long special on obesity, we ask if taxing bad foods is the answer. Food expert Professor Marion Nestle discusses whether taxing food infringes our personal liberty. And, we find out why Denmark's 'fat tax' was axed after only one year.

Sam Rowe of UNESDA, which represents the European soft drinks industry and Dr Kelly Brownell of Duke University, who came up with the idea of taxing soft drinks debate whether taxing 'bad foods' will change eating behaviour,

From New York, we are joined by Derek Yach, former senior vice president of Global Health and Agriculture Policy at Pepsi Co - now at Vitality, an organisation focused on Global Healthcare Policy - and from Singapore, David Kuo of the Motley Fool gives us the view from Asia.