But the calculations are based on a 100g-portion of the food, so condiments such as Marmite and ketchup, which are never consumed in such large quantities, are out.

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Lower income households across the United States spend a larger portion of their income on food than higher income households.

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Many patients opt for less-aggressive surgical approaches, including an adjustable gastric band (which can be reversed) that forms a pouch in the stomach, or a sleeve gastrectomy, in which a portion of the stomach is removed, leaving a tube for food to pass through.

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India's government subsidizes food for a large portion of its 1.2 billion people, which eats into its finances and inflates budget deficit.

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