MTM was an insulin dependent diabetic born in 1936, an alcoholic and a vegetarian. She was fortunate to live as long as she did.
Mary Tyler Moore
Health issues and death
On October 14, 1980, at the age of 24, Moore’s son Richard died of an accidental gunshot to the head while handling a small .410 shotgun.[72][73][74][75][76][77][78]
The model was later taken off the market because of its “hair trigger”.[79] ...
Moore was diagnosed with Type I diabetes in 1969, after having a miscarriage.[82]
In 2011, she had surgery to remove a meningioma, a benign brain tumor.
In 2014, friends reported that she had heart and kidney problems and was nearly blind.[83]
Moore died at the age of 80 on January 25, 2017, at Greenwich Hospital in Greenwich, Connecticut from cardiopulmonary arrest complicated by pneumonia after having been placed on a respirator the previous week.[84][85]
She was laid to rest in Oak Lawn Cemetery, in Fairfield, Connecticut, during a private ceremony.[86]
Philanthropy
In addition to her acting work, Moore was the International Chairman of JDRF (formerly the Juvenile Diabetes Research Foundation).[87] In this role, she used her celebrity to help raise funds and awareness of diabetes mellitus type 1.
In 2007, in honor of Moore’s dedication to the Foundation, JDRF created the “Forever Moore” research initiative which will support JDRF’s Academic Research and Development and JDRF’s Clinical Development Program. The program works on translating basic research advances into new treatments and technologies for those living with type 1 diabetes.[88]
A long-time animal rights activist, she had advocated for animal rights for years, and supported charities like the ASPCA and Farm Sanctuary.[89] She helped raise awareness about factory farming methods and promoted for more compassionate treatment of farm animals.[90] She was a pescetarian.[91]
She was also a co-founder of Broadway Barks, an annual animal adopt-a-thon held in New York City. Moore and friend Bernadette Peters worked to make it a no-kill city and to encourage adopting animals from shelters.[93]
https://en.wikipedia.org/wiki/Mary_Tyler_Moore#Personal_life
Then again, how is Dick Van Dyke still alive?
He smoked 4 packs a day and was also an alcoholic, but he is very much with us today at 92.
Some people just have great genes I guess.