Gravitational force and celery

Some days I think the gravitational force is stronger than other days. As a consequence the body is heavier and running is much harder. A distance that is normally easy-peasy becomes a real challenge. This must mean that the number of calories burned are much higher on these days than on weak gravitational force days... Yes, that is most certainly the case. In summary I figure that today's calorie deposit minus the withdrawal is negative. It's like eating celery.