I was curious about the same thing until I started taking notice of other people's carts at the grocery store.  Not only are they overflowing but there is nothing of nutritional value in them at all.  I eat chips and snack type foods but I could not imagine completely surviving off off them.  I would feel awful all the time and would always be shitting if I ate even 20% of that list.  I bet she keeps a phone charger in the bathroom.