ক্যানসার রুখতে রোজ খান দাগি কলা! আসলেই কি তাই ? সত্যিকার গবেষণা প্রয়োজন

১০ ই মার্চ, ২০১৬ ভোর ৫:০৫

সাবধান পক্ষে বিপক্ষে অনেক কথা আছে । দাগী কলা খাওয়ার পুর্বে জেনে নিন।
আনন্দবাজারের সংবাদ ভাষ্য় : ৫ই মার্চ ২০১৬
কলা খাওয়া তো ভাল, কিন্তু কেমন কলা কিনবেন বলুন তো? আপনার উত্তর নিশ্চয় দাগহীন, টাটকা ফল। তা হলে আজ থেকেই আপনার দৃষ্টিভঙ্গি পাল্টে নিন। এ বার থেকে বাজারে গিয়ে বেছে বেছে দাগি কলা কিনুন।
কারণ বিশেষজ্ঞদের মতে, দাগি কলাই নাকি বেশি উপকারি। দাগি কলা নাকি ক্যানসার রোধ করতে বিশেষ ভাবে সাহায্য করে।
কলা যত দাগি হবে তার নাকি ততই পুষ্টিগুন। লন্ডনের এক বিশ্ববিদ্যালয়ে গবেষণা করে এই তথ্য জানিয়েছেন এক দল বিজ্ঞানী। তাঁরা জানান, কলার খোসার উপরে যে বাদামি ছোপ থাকে তা আসলে টিএনএফ (টিউমার নেক্রোসিস ফ্যাক্টর)। টিএনএফ অ্যান্টি ক্যানসার উপাদান। যা দেহে কোনও অস্বাভাবিক বৃদ্ধি বা টিউমার রোধ করে এবং রোগ প্রতিরোধক ক্ষমতাও বাড়িয়ে তোলে।
এ ছাড়াও কলা অ্যাসিডিটি দূর করে। রক্তচাপ স্বাভাবিক রাখে, রক্তাল্পতা কমিয়ে আপনাকে সুস্থ রাখে।
তা হলে আর নিশ্চয় দাগি কলা দেখে মুখ ঘুরিয়ে চলে যাবেন না।

পক্ষের কথা
(কিন্তু গুরুত্বপুর্ণ আপডেট সহ )
http://hubpages.com/health/Bananas-for-Cancer-Do-Brown-Spots-on-Bananas-Fight-Cancer
MPORTANT UPDATE: The study on the TNF in bananas to cure cancer has actually been debunked on the basis that there is no written evidence proving that the study actually took place. Who is this "Professor Senji" of Tokyo University? There is no evidence that he even exists! Did someone make up this whole study from scratch? If so, what's there to gain by making up such information?
So many people now believe that bananas can cure/prevent cancer - yet there is no such evidence whatsoever. Are you now going to stop eating bananas? Please answer in the comments below!

Going Bananas to Fight Cancer
When bananas over-ripen, they develop dark brown spots on their yellow skin, become soft and mushy inside and emit a pretty strong ripe banana scent. At this stage, you probably think it’s time to toss them in the trash. But stop! Did you know that over-ripe bananas with brown spots on them actually help fight cancer?

Japanese Studies on Bananas for Cancer
A study was carried out in Tokyo University, Japan by Professor Senji, where lab mice were injected with extracts from a variety of fruits, including bananas. In this controlled experiment, it was found that out of all the fruit injected into the mice, banana marked the most improvements in the overall health of the mice. Bananas not only boosted the white blood cell count in the blood, but also inhibited the growth of cancer cells through inducing their bodies to produce a powerful substance called TNF.
When consumed, over-ripe bananas enable the body to produce a potent substance that is known to prevent and fight cancer. This natural miracle substance is known as the Tumor Necrosis Factor (TNF).
Eat the Spotty Bananas
Japanese are known to eat over-ripe bananas with brown spots regularly. But if they fall sick, they will go ahead and eat the really ripened bananas which have turned fully black. This habit is fully backed by research which proves that over-ripe bananas are rich in anti-oxidants and give the body the ability to produce TNF.
Tumour Necrosis Factor (TNF) in Bananas
Scientifically speaking, TNF is a cytokine consisting of small signalling molecules, which have a complex system to communicate with and influence fundamental cell activities and movements.
Simply put, TNF is a protein with the ability to correspond with cells and regulate their cellular activities and coordinate their movement. This is why TNF actually inhibits the development of abnormal cells, i.e. cancerous cells.
As minuscule as the small TNF molecule may seem, it has powerful functions that serve the body. Most importantly, TNF is useful in preventing cancer because it has the ability to destroy certain groups of tumour causing cells, by pumping excess water into the harmful cells and causing them to burst from the pressure.
Do brown spots on bananas fight cancer?
The Spottier, the Better!
The more brown spots a banana has, the more cancer-fighting properties it has.
Anti-oxidants in Bananas
Bananas contain a few antioxidants which destroy free radicals. Free radicals are those molecules that ravage through the blood stream causing the formation of cancerous cells. By destroying free radicals, the antioxidants in bananas are able to minimise free radical damage in the body and fight cancer in its early stages.
Eating Bananas Daily can boost your Immunity & Fight Cancer
Did you know, as per the research findings, the Japanese professor deduced that over-ripe bananas with brown spots on them have up to 8 times more white blood cell boosting abilities than under-ripe bananas.
The stronger your white blood cells, the stronger your immune system.
By eating 1 to 2 bananas a day, you can boost your immunity and strengthen your resistance against the common cold and throat infections
বিপক্ষে

http://www.skepticalraptor.com/skepticalraptorblog.php/ripe-bananas-prevent-cancer/
The mysterious Japanese Study
The actual study was published here (pdf) (or here, also pdf) in Food Science and Technology Research in 2009. I have several issues with the article with respect to the banana meme, especially in trying to make any conclusion that bananas have anything to do with “curing cancer” in humans:
1. The authors do not make one single claim (as best as I can tell) that there is tumor necrosis factor (TNF) in a banana. No, this article does not say anything about bananas having TNF. Really, nothing else I write about this article really matters, because they just don’t make any claim whatsoever about TNF and bananas.
2. The study is in a mouse model, and many animal model experiments just don’t transfer to human clinical research. The percentage of animal studies being applicable to humans is small, that’s why there’s the old joke that “we’ve cured cancer in mice thousands of times.” So, even if the authors claimed that bananas had TNF (and that would be Nobel Prize winning research), we have no clue as to whether it has any clinical impact. But let’s not forget that the authors make not a single claim that TNF is in bananas.
3. The article is published in a low impact journal. This journal has an impact factor of less than 1.0, which indicates a very low quality journal and it’s not even indexed in PubMed, which further indicates its low value.
4. The bananas are not fed to the mice, and without getting into details about the study, they try to stimulate production of TNF by essentially placing slices of banana in the mouse–of course, there will be an inflammatory response. Shocking. I am not sure why the authors did that, and I am unclear what it is supposed to prove. That it induces TNF activity might be expected since the body would react to any foreign substance (an apple, viruses, bacteria, anything) injected into the peritoneum, and production of TNF might be expected. But the TNF does not flow out of the banana, it is just the immune system’s reaction to a banana injected into the body.
5. What is the clinical significance of what was induced? In other words, is there actually TNF isolated from the bananas in a form that actually can do something? Or is there some other effect just because there’s a blob of intraperitoneal banana extract which induces some other immune response.
6. Bananas produce small amounts of serotonin (5-hydroxy tryptamine) and dopamine, depending on their stage of ripeness. These can have a stimulatory effect on neutrophils and macrophages in a living organism, and these can in turn produce the touted TNF-a, Interleukin-12 (IL-12) and other cytokines. In this role serotonin and dopamine are said to serve as a “biological response modifier” (BRM). In plain English, the stuff in ripe bananas can (but not necessarily will) stimulate a subset of white blood cells to produce chemical signals to deal with a variety of threats. However, this is a small effect, and it will not help you fight off cancer. But let’s clear about this. Bananas cannot stimulate or boost the immune system unless there’s some chronic malnutrition or disorder where you need to get more nutrition that bananas are adequate in providing. But, in healthy individuals, only vaccines can boost your immune system.
7. No one has repeated this experiment, and certainly no one has shown this effect in humans. There is not a single double-blind clinical trial to show that bananas induce a TNF-alpha response in humans. And one more point to remember: bananas do not produce TNF. It is simply an evolutionary impossibility, unless through some amazing instance of evolutionary convergence, the banana plant evolved the ability to produce the TNF molecule for a completely different purpose for the banana plant. This would violate several principles of evolution, since there are reasons why the TNF molecule evolved in mammals and not in plants.
Just for review–I dug up the original “Japanese scientific paper”, and what I found was essentially simple–the authors did not claim bananas produce TNF, but that wasn’t even the point of the article. The article actually didn’t show much, but it did not provide any convincing evidence that in humans, bananas had any effect on the immune system. Again, unless that human is chronically malnourished.

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