Believe or not, many modern diseases have a lot to do with the food and/drinks we eat/take every day. To feed the people with enough food, farmers start using artificial fertilizers to increase food productions or genetically modified transgenic crops. Animals are fed with synthesized feeds that contain hormone and antibiotics, which is under the limit set by FDA, but obviously exist and precipitate in the animal meat or carry over to the milks. Of course, a standard testing will tell you no risk for eating them because they "meet" the requirements from FDA. Unfortunately, when we eat them every day, the accumulation will be huge, which may reach the limit to cause any health problems.
Recently, there are so many examples around us like a friend of mine who has very good life style and habits with very positive attitude toward work/life. She is a Yoga coach and certainly looks very healthy. To everyone surprise, one day she was diagnosed with a cancer. And no body believe it and really do not understand she has a cancer. But this is true! After a discussion, she told us that she drank milk every day like drinking water. Here I do not want to link her cancer to the milk, but the milk from the cow that eat cloned crop feeds is definitely a food my family try to avoid.
I prefer to cooking food with the raw materials for my family; the more natural and simpler, the better. Taste may be not as good as the "delicious" food from restaurant, but I know what I put during cooking.