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US food labeling law requires that trans-fat value should be listed in the nutition fact table of foods so that the users can calculate the amount intake for their healthy daily diet. The law is effective since Jan 2006 and trans fat value should put after the saturated data in the nutrition fact list.
FDA believes that with the applying this law, in the next 3 year after the effective day (Jan of 2006) it  Trans fat follows saturated fat will help to reduce the number of deads cause by coronary heart deseases 250 to 500, saving upto 1.8 billion of dollars. These data is based on studies by scientists of the Institute of Medicine, National Academies of Science (IOM/NAS) from which it decided to put to labeling rule.The awareness of public leads to actions by states authorities and various sectors relating to food services. New York City authority bans restaurants to use trans fat since July 1, 2007, being the first city in the US to ban all restaurants to use artificial trans fat in their dishes. Then Philadelphia authorities will ban trans fat since Sept 1, 2008. Many other states are on the way, and sooner or later trans fat will be banned, or reduced in restaurants or food supplying services in these states. Food sectors are of course aware of the war against one of the cause of coronary desease attack, the obese and overweight problems. Part of Disney’s foods served will be reduced trans fat in this year, and it is scheduled that in the promotion foods in 2008 the trans fat will be banned. The actions against the trans fat are also seen in England, Canada, and surely will spread out in other countries around the world, especially in developed countries. Important and huge retailers in UK such as ASDA, Marks & Spencer, Sainbury’s….are considering some actions on the matter. This does not mean that all will joint the boat, but whatever food business you engage in now, it’s wise to think of the actions before it is too late.
----------------------- Chemical formation of unsaturated fat acid is in below drawing. Note that two hydrogen atom bonds are on one side of the carbon atom. The fat is unsaturated fat.  Formation of unsaturated acid
In the below drawing of trans fat a hydro bond is on one side of the carbon bonds, so we call it trans fat. Trans is a Latin prefix meaning across.  Chemical formation of trans fat |