The commodity markets also got considerable attention last week, as wheat rose sharply early on before getting hit by some profit taking.

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"The cost of world commodities, including sugar and wheat, rose even more quickly, inevitably working through to some shop prices, " he added.

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Some argue that using farmland for ethanol pushes up food prices internationally (world wheat prices rose 25% this week alone, perhaps as a side-effect of America's ethanol programme).

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Wheat prices rose 25% last week to hit two-year highs as drought and fires have devastated crops in parts of Russia, and led to the government banning the export of grain including wheat, barley, rye and maize.

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The coach told Rose to try a diet without wheat, dairy, or refined sugar, emphasizing instead fresh fruits and vegetables, lean meats, and gluten-free whole grains such as brown rice and quinoa.

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