Everything in Tribes has Weight measured in Grams.
If People want to move from one Square to an adjacent Square, they must consume 1 Calorie for every 100 Grams moved.
If someone carried 200 Pinyon nuts, each weighing 2 Grams to an adjacent Square they would consume 4 Calories ( (200 x 2)/100 ) in addition to the 500 Calories to move themselves (50000/100). So they would consume 504 Calories per Square moved.