Interesting.
For all of you who have been paranoid about Genetic Engineering being used for "super soldier" programs... this would be it, right here.
I'll translate: the enzymes necessary to turn fatty acids into the sugars our body uses for energy are, usually, not present in the muscles or other
areas. What these researchers managed to accomplish was to make it so that this enzyme is expressed in the cells used to form musculature. This
enables the muscles to, quite literally, 'digest fat' and burn the resulting sugars.
I'll be honest, here - I'd be tempted to have this type of modification done to my kids (while it is still a zygote, I would imagine...). Why?
Because my kids are going to be better than yours

(that is, after all, the point of reproduction and the careful mating selection humans go
through).
Really, this is a similar take on what nature has already done in our own human history with the enzyme amylase. It was, once, only present in our
pancreas (and secreted into the lower GI tract) - but a relatively recent mutation led to it being present in our salivary glands (and, thus, saliva).
The mutation isn't a 'standard' mutation - but more like genetic code was copied to another section of the genome.
www.thetech.org...
scitizen.com...
As for my comment about human mating selection:
health.howstuffworks.com...
Basically - many of our body odors serve as a general description of our genetic makeup. There is research evidence to suggest human beings (at
least) are able to detect certain genetic expressions via smell and compare them to their own genetic code; a process designed to spur diversity
and/or eliminate problem genetics.
This factor is one that is overlooked in most modern theories of evolution... the idea that organisms have -already- begun a process of self-selection
based on a completely separate set of criteria.
Anyway.... this is all stuff I find to be quite fascinating.