It is to keep the blood flowing
The answer to this question is PHYSICAL DEVELOPMENT
The changes that occur in body size, proportion and strength start from early childhood and continues into puberty (where there are rapid changes) and adolescence. <span>This development is asynchronous, that is, the body systems differ in their pattern of growth.</span>
Well, it depends what's on the pizza. I am going off the assumption you're talking about a cheese pizza.
One slice for a 14" Medium cheese pizza is 285 calories.
The whole 14" Medium cheese pizza would contain approximately 2,269 calories.
Hope this helps!