"Everything you eat and drink changes the chemistry of your blood. Our cell membranes are lined with fats that are comprised primarily of those we've eaten in the last 90 days." Keith I Block, MD, Medical Director of the Block Center for Integrative Cancer Treatment and Director of Integrative Medical Education at University of Illinois College of Medicine. Did you note he says "in the last 90 days"? You cannot change your body overnight. You do it steadily over time!