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Howie examines the energy content of the diet of a polar explorer. Normally, a man needs about 12,000 kJ of food energy per day but Dave, the polar explorer, needs 27,000 kJ to drag a heavy sledge and keep warm in freezing conditions. Howie鈥檚 lunch has 800 kJ per 100g. However, Dave needs 2,700 kJ per 100g to keep the total weight to under 100kg.