A007:
All food, according to Islamic law, should be “halal,” i.e., allowed by the law, and “tayyib,” i.e., good, pure, wholesome and agreeable. Under the latter condition sometimes even lawful things become forbidden. For example, if a Muslim contracts colon cancer (caused by animal flesh putrefying in the colon), or if a Muslim sister contracts vaginal cancer from consuming excessive amounts of beef (check recent nutrition reports on the effect of beef consumption in the U.S.), then that beef – though lawful – becomes forbidden...
It is impossible for a vegetarian to contract colon cancer, because vegetables, fruits and grains pass through the colon. Animal flesh lodges in the walls of the colon and putrefies (rots), thus causing cancer of the colon...
There have also been many reports of diseased fish being caught with cancerous gills that are cut out and then sent to market to be sold. These are the reasons why a Muslim vegetarian abstains from not only the forbidden, but even that which is lawful...