In order to maintain your health and well being it's really important that you have ALL of your packs.
Cambridge has a very fine balance of protein, carbs, fat, vitamins and minerals... by not eating all your packs you risk developing ketoacidosis....
Which is life threatening and recently killed a woman up North, who was living in soup and water....
She was 26 I think...... her body was soo laden with ketones it became toxic and she lapsed into a coma and died.
I'm not trying to frighten you, but you need to be very aware of the dangers of not eating all of the packs on a regular basis... it's OK to miss the very occasional one but anything regular is dangerous.