For products such as bread, state they are either natural or organic, what is the difference? 
Natural is purely a marketing term, and it is essentially meaningless since it isn't regulated by the USDA (I'm assuming you are in the USA, I can't speak for other countries). Since the term isn't regulated (with the apparent exception of meat), any manufacturer can put it on any (non-meat) product that they want, whether it is actually "natural" or not.  Organic is well-defined by the USDA and places a number of restrictions on the types of pesticides and other chemicals that can be used to grow the crop. For things like meat, the organic label regulates both the drugs that the animal is given as well as the production of the feed.     Certified organic food products are   regulated by the U.S. Department of   Agriculture and produced by farmers   and manufacturers under a strict set   of rules. But the agency defines the   term "natural" only for meat and   poultry. In the rest of the food   industry, the meaning is largely up to   the producer.   See: http://articles.chicagotribune.com/2009-07-10/business/chi-natural-foods-10-jul10_1_organics-or-least-chip-popular-horizon-organic-brand-organic-industry-watchdog-group 