If you miss one packet that is fine, but if you make a habit of it...thinking you'll lose weight quicker, you will do your body damage. The three packs have everything the body needs to live. It is a controlled starvation diet, but if you regularly miss packs then you will just be literally starving your body. Its not a problem as a one off....I suppose you can be ill and not eat for days, but over a prolonged period, you would do your body damage hun.