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Anonymous
Because whatever study or experiment they conducted showed a definite trend, but wasn't conclusive for some reason or another.
If you survey a hundred runners as to whether or not A diet will lower their times faster than B diet, and 80 out of a hundred perform better on A diet, there's obviously a pretty strong trend, but there's no real way to PROVE based on those findings that A diet is better for runners in general.
Scientific method; the more trials, the more accurate the results. Most of these studies are done by people or groups who don't have the resources to survey or test extremely large numbers of people, or to completely control every variable, so their studies, while informative, can't be completely conclusive.
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