Conjugated linoleic acid (CLA) is set to become a major sports nutrition supplement in the next decade. Since CLA was first identified as an anticarcinogen factor in ground beef (Pariza et al 1979). CLA has been found to have many useful properties that have been demonstrated in animal studies. Over the last few years many of the effects reported in animal studies have been replicated in human studies and CLA supplementation in humans is now an exciting area of research.
Since CLA has been shown to reduce body fat it is likely that this will be the main reason for supplementation. Human studies have supported evidence from animal studies to show that supplementation with as little as 3.2g of CLA per day can significantly reduce body fat mass in overweight and obese humans. (Blankson et al 2000) There is speculation that the low levels of CLA in a modern diet may be a contributory factor to high levels of obesity reported in Western Societies. It is easy to see that shortages of CLA may occur in a western diet when you consider the different CLA levels in the milk of cows that are intensively farmed as opposed to pasture fed. It is important to recognize that CLA is the name for a group of compounds, not all CLA is the same. CLA consists of a group of dienoic isomers of linoleic acid not all of which have active properties. Studies have found large variations in the trans-isomer composition of CLA, the important cis-9, trans-11 isomer may be as little as 73 % to over 90% of the total CLA.
For general health benefits CLA supplementation of 2-3g per day seems appropriate but those looking for a positive effect on body composition should take 3-6g daily. CLA is a natural food constituent; it is well tolerated and is not a stimulant.
Conjugated linoleic acids (CLA) CAS:2420-56-6, are a family of at least 28 isomers of linoleic acid found mostly in the meat and dairy products derived from ruminants. CLAs can be either cis- or trans-fats and the double bonds of CLAs are conjugated and separated by a single bond between them.CLA is marketed as a dietary supplement on the basis of its supposed health benefits.
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