A system for determining the amount of food in a canteen is disclosed. The system comprises computing means for computing the amount of food a customer has taken on the basis of a weight of the food measured with a weighing device and/or information describing the meal portion; short range wireless telecommunication means (102) operationally connected to the computing means so as to transfer information describing the amount of food wirelessly with a personal apparatus of said customer; and a processing apparatus (100) configured to carry out a payment procedure by receiving a message comprising information describing the amount of food taken by the customer and by processing the received information describing the amount of food according to a predetermined criterion.
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