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Added hormones, to varying extent, are used (or have been used) extensively in food production. Hormones have been used in animals in order to make them grow faster, which increases profitability (the faster the animals grow large the faster they can be butchered.) In addition, hormones have been used in milk production to increase the output of the cows. The question you are asking is whether these added hormones have an effect on our health, specifically whether the added hormones are having an effect on the age at which puberty starts. Let's take a look:
It is important to remember that whether or not "extra" hormones are added to animals, there are already hormones in them (in the same way that people have hormones in their blood.) What the debate is concerned with is the addition of extra hormones. The biggest concern people have with hormones being added to animals (cattle or cow,) aside from the distasteful nature of messing with nature, is that the hormones will cause an increase in the risk of cancer for those people who consume them.
There are six different kids of hormones that are approved for use in cattle and sheep, and one hormone that is approved for use in dairy cows. The problem is that not a lot of good research has been done about the effect of these hormones on humans (when it comes to causing cancer or early puberty.) Partially the problem is that the hormones are already naturally occurring within the animals in quantities that vary between animals...therefore, it becomes difficult to determine (looking at the milk or meat) how much of the hormone found there is natural and how much of it was a result of the application of the hormone artificially.
There are links between steroid hormones and breast cancer, as well as early puberty and breast cancer, but the amount of steroid hormone that might be transmitted by beef is tiny compared to the amount the body is naturally producing. According to Cornell University: "The breast cancer risk of women who eat meat from hormone-treated animals has not been compared with the risk of women who eat meat from untreated animals." This further complicates things.
The situation is similar to the hormones introduced to dairy cows to increase milk production. Though largely eliminated in the US due to public pressure (and banned in a lot of other places in the world) "growth hormones" in dairy cows "is effective in promoting growth in cows, but does not work in humans. Scientists know that rbGH is not recognized as a hormone by human cells." It would seem that the cow hormone does not have an influence on human beings, but that "evidence does not exist to answer this question. Use of rbGH for dairy cattle has been in practice in US for only six to seven years. Breast cancer can take many years to develop. It is too early to study the breast cancer risk of women who drink milk and eat milk products from hormone-treated animals."
So there you have it. People worry about hormones being added to their food and causing cancer or early puberty, but there aren't any good studies proving these theories. That doesn't mean the links don't exist, but they have not been proven so far. The opinion of a lot of people, though, is "why take the chance?"
Hormones are substances or chemicals of many different types produced by body ,that control many different functions. Hormones at as kind of chemical messengers that communicate to various parts of body and body systems to regulate their working in a coordinated way.
Scientists have identified many different types of hormones that control different body functions. The body activities including body controlled by hormones include growth, reproduction, way the body uses food, regulation of composition of blood, reaction of body to emergencies, and control of hormones itself. Hormones play a key role in the changes and developments that take place in body from infancy to adulthood. The total number of hormones identified are more than thirty.
Hormones can be used to treat health problems caused by hormone deficiency and some other some diseases not caused by hormone deficiency. Hormones are also to regulate some body function, for example for birth control.
Thus we see that the impact of adding hormones in food or injecting it in our blood can have many different affects depending upon the nature of the hormone the condition of body. There are some hormones related to changes and development of body during puberty.
Hormones are not directly added to our foods as such, rather they are given to livestock that enters the human foodchain. They are introduced into animal for a number of reasons, usually to increase muscle mass and growth. In other words, animals become "beefier" more quickly. But there are a number of concerns. Many of these are similar to sex hormones. That wouldn't be a problem in itself, except that they are retained by the livestock, and often converted into other unsuitable compounds. The long-term effects of these residues in human remains unknown. It has been alleged that not only may they affect sexual differentiation (particularly during pregnancy) but they may promote certain forms of cancer. As you state, there is good evidence that they are lowering the age of the development of puberty. There is also the very serious problem that many of these hormones are excreted by livestock and end up in water supplies for human, where there are no mechanisms for filtering them out.
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