(Courtesy of a forwarded mail from Tang Tuck Hoong)“Normally, how we cook the instant noodles is to put the noodles into a pot with water, throw in the powder and let it cook for around 3 minutes, and then it's ready to eat."
This is the WRONG method of cooking instant noodles.
By doing this, when we actually boil the ingredients in the powder, normally with MSG, it will change the molecular structure of the MSG, causing it to be toxic.
The other thing you may or may not realize is that the noodles are coated with wax and it will take around four to five days for the body to excrete the wax after you have taken the noodles.
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CORRECT METHOD:1. Boil the noodles in a pot with water.
2. Once the noodles are cooked, take them out and throw away the water which contains wax.
3. Boil another pot of water till boiling and put the noodles into the hot boiling water and then shut the fire.
4. Only at this stage when the fire is off, and while the water is very hot, put the ingredient with the powder into the water to make noodle soup.
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Another information from from http://www.breakthechain.org/exclusives/noodles.html:
INSTANT NOODLES
Dear instant noodle lovers, make sure you break for at least 3 days after one session of instant noodles before you eat your next packet! Please read the info shared to me by a doctor. My family stopped eating instant noodles more than 5 years ago after hearing about the wax coating the noodles - the wax is not just in the styrofoam containers but it coats the noodles. This is why the instant noodles do not stick to each other when cooking. If one were to examine the ordinary Chinese yellow noodles in the market, one will notice that, in their uncooked state the noodles are oily. This layer of oil prevents the noodles from sticking together.
Dear instant noodle lovers, make sure you break for at least 3 days after one session of instant noodles before you eat your next packet! Please read the info shared to me by a doctor. My family stopped eating instant noodles more than 5 years ago after hearing about the wax coating the noodles - the wax is not just in the styrofoam containers but it coats the noodles. This is why the instant noodles do not stick to each other when cooking. If one were to examine the ordinary Chinese yellow noodles in the market, one will notice that, in their uncooked state the noodles are oily. This layer of oil prevents the noodles from sticking together. 
Wantan noodles in their uncooked state have been dusted with flour to prevent them sticking together. When the hawker cooks the noodles, notice he cooks them in hot water and then rinses them in cold water before cooking them in hot water again. This process is repeated several times before the noodles are ready to be served. The cooking and rinsing process prevents noodles from sticking together. The hawker then "lowers" the noodles in oil and sauce to prevent the noodles from sticking if they are to be served dry.
Cooking instructions for spaghetti require oil or butter to be added in the water when boiling the spaghetti to prevent the pasta from sticking together. Otherwise, one gets a big clump of spaghetti!
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There was an SBC (now TCS) actor some years ago, who at a busy time of his career had no time to cook, resorted to eating instant noodles everyday. He got cancer later on. His doctor told him about the wax in instant noodles. The doctor told him that our body will need up to 2 days to clear the wax.
There was also an SIA steward who after moving out from his mother's house into his own house, did not cook but ate instant noodles almost every meal. He had cancer, and has since died from it. Nowadays the instant noodles are referred as "cancer noodles".
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Refutation:
According to Snopes.com (http://www.snopes.com/food/warnings/noodles.asp), the e-mail version of this warning dates back to 2000, but the rumor has existed for decades. 
Original versions warned of health problems caused by wax buildup in the stomach. It told the story of an individual who died during an operation to remove the wax layer from his stomach.
Original versions warned of health problems caused by wax buildup in the stomach. It told the story of an individual who died during an operation to remove the wax layer from his stomach.This version seems to recognize the ridiculousness of surgery to remove a wax lining in your stomach, instead cautioning you to allow plenty of time between servings for your stomach to "clear the wax."
But, not to make you think that the risk is somehow lessened, this version alludes that the wax is somehow carcinogenic. Despite what this letter claims, I have not yet found anyone, other than the author of this chain that refers to instant noodles as "cancer noodles."
An anonymously authored and haphazardly forwarded e-mail warning should never replace legitimate medical resources and your physician for health advice. 
My remark: One has to reason and decide for oneself as to the truthfulness and applicability of the so-called Correct Way. I personally feel that there is no harm boiling the water twice to cook the instant noodles as a precautionary measure. What say you?