Definition: "An ergogenic aid is any substance or phenomenon that enhances performance "
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21.09.2011 |
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Anti-cancer supplements need plant-based proteins to be effective
In the 1980s manufacturers developed new types of feed for lab animals that were intended to improve the quality of research. These new feeds no longer contained substances of plant origin. And suddenly the findings from animal studies that had used the new feed showed that all kinds of substances that offer protection against cancer were no longer effective.
Study
The researchers tested two preparations that contained protective compounds. One was pure genistein, a soya isoflavone. The other was grape seed extract, a preparation from grapes that contains catechins. The researchers gave the preparations to female rats that had been injected with substances that cause breast cancer, and then observed whether the preparations inhibited tumour growth.
Results
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In the rats that were given AIN-76A feed, the genistein offered them no protection. The rats that got Teklad feed containing 0.8 percent genistein had 44 percent fewer tumours. The rats that got Teklad feed with 1.6 percent genistein had 61 percent fewer tumours.
The figures below show the results of a different experiment. The black triangles represent rats that had no grape seed extract in their food; the white circles rats that got feed with 1.25 percent grape seed extract; and the black squares rats that got feed with 5 percent grape seed extract. In this experiment the carcinogenic substance used was DMBA. The figure immediately below shows the results for the AIN-76A group; the one under that shows the results for the Teklad group.
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Once again, the grape seed extract had no effect in the rats that were given AIN-76A feed, but it did have an effect in the animals that were given Teklad feed. Teklad feed containing 1.25 percent grape seed extract gave no protection, but feed with 5 percent reduced the number of tumours by 44 percent.
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