 Between 1940 and 1971, the synthetic estrogen DES was prescribed to several million pregnant women with a promise that would help prevent miscarriages. Problems of her first highlighted in 1953 when it became clear that not only was DES ineffective might actually be harmful, however a powerful and emotive advertising campaign ensured that its use continued until 1971 when it was found to cause cancer of the vagina in the daughters of the mothers who took it. DES was also used to stunt the growth of girls who were predicted to grow abnormally tall. As one pediatric textbook put in 1968, excessive tallness in girls can be a handicap. It provides difficulty in purchase of smart clothes. The victim is ineligible for certain sought-after professional positions such as airline hostess and poses problems in selecting suitable dancing partners. But most people don't know that the greatest usage of DES was by the livestock industry, improving feed conversion in cattle and chickens. Within a year of approval it was fed to millions of farm animals, and although it was shown to be a human carcinogen in 1971, it was not until 1979 that all use of DES in the meat industry was banned. Now they just use different synthetic estrogen implants, but even now decades after DES was banned, we're still seeing the effects, an elevation of birth defects even down into the third generation. Arsenic is another human carcinogen that was fed to chickens, this time by the billions. The arsenic ends up not only in the meat, as I talked about previously, but also in the feathers, which are fed back to the animals. See, a third of the bird is inedible. What do they do with billions of pounds of heads, bones, guts, and feathers? Fertilizer and animal feed. Feather meal is fed back to chickens, pigs, cows, sheep, and fish. Now, straight feathers, not particularly nutritious, so guts, heads, and feet may be added for a little extra protein, and manure added to the feed for minerals. The problem is that feather meal used as animal feed could contribute to additional arsenic exposure in persons who consume meat. This gave researchers an idea, though. By testing feather meal, they might be able to find out what else chickens are fed. Feather meal, a previously unrecognized route for reentry into the food supply of multiple pharmaceuticals and personal care products. All samples tested positive for antibiotic type drugs, between two to ten different kinds in each sample, including fluoroquinolones, which have been banned for years. So either the poultry industry is illegally still using the stuff, or it's being used in some other animals, fed to the chickens. Regardless, when the feather meal is fed back to the chickens, they are getting exposed to this drug which is against the law to feed the chickens, creating a cycle of re-exposure to banned drugs. Then it just gets weirder. The feathers turned up with half a dozen other drugs, Prozac, antihistamine, fungicide, sex hormone, and caffeine. Why doesn't the poultry industry just say no? Evidently, the antihistamines are to combat the respiratory problems from packing in so many tens of thousands into the confinement sheds, and the caffeine helps keep the chickens awake so that they eat more and grow faster.