Definition: "An ergogenic aid is any substance or phenomenon that enhances performance "
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11.11.2014 |
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Polyunsaturated fatty acids make you slimmer and more muscular
High fat
To start with the researchers gave their rats half of the amount of food they would normally eat for a few weeks. The animals therefore lost weight. Then the rats were given the calorie-rich high-fat diet for four weeks, and put on weight.
The type of fat the researchers gave the rats varied. The figure below shows what happened to the animals' fat and lean body mass when fed with lard, rapeseed oil, safflower oil, grapeseed oil, sunflower oil or maize oil.
As you can see, the rats that were given vegetable oil all built up more lean body mass and less fat than the rats that were given lard. The best results were achieved with safflower oil.
If you look at the composition of the fats that were used you can see that it's above all the amount of polyunsaturated fatty acids [PUFA] that determines the effect on body composition: the more polyunsaturated fatty acids, the more muscle and the less fat the rats built up.
N-6 fatty acids
Conclusion
"Whether diets providing such high PUFA intake, exceeding 25% of total energy intake, are safe and effective in modulating body composition and metabolic health in humans are issues that must be considered with caution."
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