Stem cells

after all the hype on why we have to kill embryos, it turns out that fat can supply stem cells.

Historically, stem cells can come from a variety of tissues. These include umbilical cord, fetal tissue, bone marrow, or the best source as adipose or fat cells.
Adipose derived stem cells have the highest numbers of cells when collected and tested compared to all others . This is by far the preferred method of stem cell therapy because of sheer numbers and the fact that they are coming from your own body. This is called autologous therapy.

Healing an injured heart

I remember when one of my diabetic  patients tried to get in a human (adult) stem cell injection experiment in Minneapolis, but alas because of his diabetes, borderline diabetes, and a previous small stroke he was turned down.

Well, I have no idea how that one went (I believe it was mildly successful in some patients) But now the BBC reports a large study in London

LINK

The study, which will involve 3,000 patients in 11 European countries, should show whether the treatment can cut death rates and repair damaged tissue after a heart attack.
All the patients will have standard treatment to widen their narrowed arteries, which involves inserting a small tube called a stent. In addition, half the patients will have stem cells taken from their bone marrow and injected into their heart.
This will happen within days of them suffering a heart attack.

so they will be trying to fix people early after a heart attack, not later trying to repair hardened scar tissue.

It is unclear exactly how a patient's own bone marrow stem cells might help repair their heart.
Donor adult stem cells have been used successfully for decades in bone marrow transplants, but in that situation it is a like-for-like replacement.
Expecting these cells to survive in the heart and transform into specialised heart cells is a huge challenge.