How many 100 g bars of milk chocolate does a 70 kg runner burn in a marathon?

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The answer

5.6 bars

Only about 5.6 bars. For more than three hours of running.

How to get there

1. 70 kg × 42.2 km × 1 kcal = 2,950 kcal
2. ÷ 530 kcal per bar
3. = about 5.6

Source: Calculation with the 1 kcal/kg/km rule of thumb and 530 kcal per 100 g

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