Dear Docs and friends of medical science,

The secret of 'muscular' old age http://news.bbc.co.uk/1/hi/health/4502862.stm

Scientists believe they have found a way to enable the elderly to maintain
muscle.

Muscle is constantly being built and broken down, which works to maintain a
balance in young adults. But as people age, the breakdown process is more
successful than the muscle-building action. However French researchers, writing
in the Journal of Physiology, say adding the amino acid leucine to old people's
diets could help them keep muscle. UK experts agree, saying the best way to
boost leucine levels is to eat meat.

Slow down

Once adults reach 40, they start to lose between 0.5 and 2% of their muscle each
year. The team from the Human Nutrition Research Centre of Auvergne, in
Clermont-Ferrand, France looked at the behaviour of proteins in muscle. As in
all mammalian tissues, proteins are created (synthesised) from amino acids and
digested (degraded) by enzymes. Straight after a meal, the rate of synthesis
doubles, prompted by the arrival of a large amount of amino acids. The rate of
the breakdown of protein is highest in-between meals.

The difference between the two rates determines how much protein remains in the
muscle. But, in older animals - and, it is believed, includes humans - the amino
acid stimulus prompting synthesis is less effective, and the process slows down.
However, the breakdown of proteins is not, leaving older animals with less
protein than their younger counterparts. The researchers compared protein
breakdown in young (eight-month-old) and old (22-month) rats.

They discovered that the slow down in degradation that normally follows a meal
does not occur in old animals, so there is excessive breakdown. But when the
scientists boosted levels of one amino acid, leucine, the balance of synthesis
and breakdown was restored.

Falls danger

The team, led by Dr Didier Attaix, suggest the protein processing imbalance
which comes with age results from defects in the complex machinery that breaks
down muscle protein, and that leucine supplementation can fully restore correct
function. He said: "Preventing muscle wasting is a major socio-economic and
public health issue, that we may be able to combat with a leucine-rich diet." Dr
Michael Rennie from the University of Nottingham Medical School at Derby told
the BBC News website said more research into the finding was needed. But he said
older people could make changes to their diet now which could help them maintain
muscle.

"If they don't, they can fall over more easily; they can trip downstairs or fall
in the bath." Dr Rennie said older people could act now, even before further
research had been carried out. "Leucine is most abundant in meat, so it makes
sense in terms of protein synthesis to eat meat. "As people get older, they tend
to need to eat less. But people should maintain their protein intake as they
age."

Forwarded by Dr.BHUDIA-Science Group Of INDIA.
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