Anand (1971) - (Movies To See Before You Die - Drama)

Hi Amit,
Have tried to answer you in the following points.

One: This is a myth.
Whether a peson has someone or something to lose or not, his or her greatest fear remains DEATH. And it is not obvious that if someone is all alone in this world then he is ready or willing to die.
That is infact very wrong notion overestimating the humans. 
For example, j​​​​​​Just try to find such people even in the yogis and saints who have no one left in the relations in the entire world.
Even they love life and wish to live longer.

Two:
This is another contradiction you are thinking absurdly as mind and body are two separate identities. A person might be so happy and jolly person but his body might react to a medicine or food or climate or anything for that matter.
The body is not mind.
Yes once someone is sick or suffering then mind does play an important role to get him cured with positive thoughts and courage. But a jolly mind cannot guarantee a disease less body.
For instance you might have seen saintly people getting caught by serious diseases like Cancer when they neither drink nor smoke nor eat non-veg food and mostly eat just home-cooked dishes.
And if you have not seen life in that cruel form, then just visit a cancer hospital and observe/study some cases to enlighten yourself.

In short, your attitude towards life can make you live a happy life, but living a healthy life depends upon a lot of factors.
The food you eat, the water you drink and the air you inhale (in a polluted city like Delhi) holds the key.
In other words, do you think pollution will not affect the people, who are always smiling and jolly in nature? Are they inhaling different air from others?

Give it a thought!
Hope you will get your answers in the above points.
Cheers!