eat meat say french scientists

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eat meat say french scientists

#1 Postby CollegeB » Tue Dec 13, 2005 8:12 am

The secret of 'muscular' old age

Maintaining muscle mass is easier when young
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.

People should maintain their protein intake as they age
Dr Michael Rennie, University of Nottingham Medical School at Derby

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 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 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."

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#2 Postby michaelhobson » Tue Dec 13, 2005 11:50 am

UGH! Yes, eat meat and all will be well. Of course, you will die of heart disease long before the muscle wasting becomes an issue. :lol:

Where is it found? Leucine is present in all protein foods, such as meat, fish, eggs, milk, and beans. It is also found in soy protein, whey protein, and other protein supplements.

Who is likely to be deficient? Since all protein foods are good sources of leucine, only an individual deficient in protein would become deficient in leucine.3 A strict vegetarian or vegan diet, without adequate soy or other protein sources, might be inadequate in its content of leucine, though most American vegan diets are not leucine deficient.

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#3 Postby CollegeB » Tue Dec 13, 2005 12:31 pm

Thanks Michael. I figured there was something these scientists had overlooked.

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