A serving of a certain brand of potato chips is 100 calories. How much heat in joules would be released by burning those calories

1 food calorie = 4.184 Joules of energy

If you eat one serving of those chips, then

the metabolizing (burning) of all that fat and

salt and carbohydrate in your body produces

(100 x 4.184) = 418.4 joules of energy.

That's the work required to lift a 100-lb weight about 3 feet off the floor.