See this quote from Jed McKenna:
 
 

Effort within the mind further limits the mind, because effort implies struggle towards a goal and when you have a goal, a purpose, an end in view, you have placed a limit on the mind.
Bruce Lee
 
 
To express yourself in freedom, you must die to everything of yesterday. From the 'old', you derive security; from the 'new', you gain the flow.
Bruce Lee
 
 

Bruce Lee was much wiser than people think. 
His self inquiry approach was fantastic. 
 
Truth comes when your mind and heart are purged of all sense of striving and you are no longer trying to become somebody; it is there when the mind is very quiet, listening timelessly to everything.
Bruce Lee

Mummified Buddhist monk 'still alive after 200 years and is nearly a Buddha'
 
http://www.ibtimes.co.uk/mummified-buddhist-monk-still-alive-after-200-years-nearly-buddha-1486570  

Here, Osho is saying something totally opposite :
"Once in a while it has happened that way, but such events are very rare -- as good as non-existent -- that a person has died immediately upon becoming enlightened. It would be as if someone was already a skeleton, there was nothing at all of any accumulation, and the person died the very first day he fasted. It would mean that such a person was just ready to die, he had no savings at all. But it is difficult to find such a person; even a hungry beggar's body keeps savings, some accumulated stock necessary for any emergencies. Such a coincidence may happen sometime that a person's actions also come to completion at the same moment as enlightenment. It is, however, a very rare phenomenon. Normally they have stayed and lived for many years after enlightenment -- be it Buddha or Mahavira or someone else. What is the reason for continuing to live? -- because liberation has already happened. It is the burden of past action, its momentum, that goes on pushing the body ahead on the journey for some time. When that momentum is dissipated, jeevanamukti, the liberation while living, will become mahanirvana."
- Finger Pointing to the Moon - Osho

Red herring!
Go work on enlightenment.
If you happen to die getting enlightened, we promise to shed a tear for you

Yeah Ramana died of cancer, but then most people die of cancer when they get old. You have no foundation to say it was realization that caused it in him or any other sage who has died. Ramana was still 70 when he died, and was realized at age 16. Maharaj was 84. They grew to be pretty old. And even if the Buddha was often sick (who the hell knows), and Mahavira had stomach aches, how can you make the claim that it is because of realization? You have presented no reason whatsoever that make that assumption. People get sick, no matter what awareness they have attained.
And looking at modern sages/teachers like Spira, Mooji, Ralston, Young they come off as healthy and vibrant, and some of them are getting up there in age.

The phenomenon is not natural; one should say, it is beyond nature. When a phenomenon occurs which is contrary to nature, or which is beyond nature, the entire harmony and adjustment of nature becomes disorderly. A great deal of preparation is needed if one wants to save oneself from such a disorderly state. Various yogasanas and mudras, yoga postures, are very helpful in this respect. In fact all the techniques of Yoga are useful in this direction. So you need an extraordinary body -- an ordinary body won't work. You need your body to be made of steel so that it can withstand an unnatural phenomenon of such great magnitude. 
 
Ramakrishna died with a cancer of the throat, Raman Maharshi died with a cancer. J Krishnamurti suffered almost forty years with the most intense migraine possible. Buddha was often sick, so much so that one of his disciples -- an emperor, Prasenjita -- offered him his own personal physician. For his whole life, King Prasenjita's physician followed Gautam Buddha with a large wagon full of all kinds of medicines, books on medicine, particularly those which might be needed for Buddha. Mahavira continuously suffered from stomach troubles and finally died from the same troubles.
Very few people survive enlightenment, and the reason why these people survive is strange: people who have been adventurous, people who have enjoyed taking risks, who have lived like a tightrope walker, whose lives have been on a razor's edge, may survive. The shock will be there, but they are accustomed to smaller shocks. They have never had such a big shock, but smaller shocks have prepared them to accept even this enormous phenomenon. They still continue to breathe; their heart still continues to beat. But still the body suffers in many ways because something has happened that the body cannot understand.
No scripture of the world discusses it. The question of discussion does not even arise -- no scripture even mentions it, and it has been happening for centuries. Perhaps they were afraid that if they say it... People are already not interested in enlightenment, and if you tell them that this is going to be the reward -- that you become enlightened and your fuse goes off -- this may prevent even those few who might try. They will say, "What nonsense it is. You work hard to attain enlightenment and what do you get as a reward? -- that you are finished! You are not even going to see yourself enlightened. So what is the point? It is a strange game.
 

Cancer is not the only cause. Great India mystic Vivekananda died at age of thirty-nine, not due to cancer. Enlightenment certainly disturbs much psychosomatic health, because it is something for which the body is not ready or prepared. Nature has not built in anything in the body so that enlightenment can be absorbed.
Mystics are not ordinary people, they have extraordinary health, still few survive full enlightenment, or save their brain.