To make the weight, Mr Ellicock packed a sleeping bag, climbing rope, biology textbook, ankle weights and "random bits of clothing".

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The pair also has an adequate amount of heft without being overbearing when added to the weight of an already packed rucksack.

ENGADGET

Twenty one people, who were all normal weight, were shown pictures of calorie packed foods while they were positioned in a magnetic resonance imaging (MRI) machine at Imperial College London.

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