How can stem cell base therapy aid a personage suffering from heart attack, parkinsons disease and diabetes?

diabetes type 1, that is. any help is great!
Answers:
Stem cells hold room to grow and develop still.. that is why stem cell therapy is so helpful.
idk how it would help parkinsons but if the heart attack of a person is cause by its' pace maker cells you could a moment ago simply replace the old one w/ the artificial heart and good to go. diabetes... i would assume it have something to do with making artificial bone marrows.
They help by - tissue rebirth.

However, such researches are still going on and it's not 99% safe yet. At least not immediately yet.

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