why we human beings need have dinner every day?

I am in a six day vacation now, I am relaxed and can do thing randomly. there is much time I can allocate , but breakfast,lunch and supper are the necessary rutine I can not avoid, I always feel them come too fast everyday, sadly ,as an organism , we human beings must take food to maintain the certain functions of our bodys, taking foods becomes a burden theseday. fortunately, I have the ability to eat and by these means I survive.