Quite the contrary (that research makes the common logical error of assuming that just because something may have conferred a selection advantage over eons of evolution, that it does so today in a world with no calorie/nutrient scarcity). See the following thread and article:

http://news.ycombinator.com/item?id=676446

and

http://www.amazon.com/China-Study-Comprehensive-Nutrition-Im...

There is also an alternative theory that "Man's ability to digest starchy foods like the potato may explain our success on the planet"

http://news.bbc.co.uk/2/hi/health/6983330.stm

So does this mean that a diet rich in potato is best nutritionally? Of course not. In evolutionary times whatever could deliver the most calories was 'best nutritionally'. Our inbuilt instinct to follow this path has most likely lead to the current obesity epidemic. To work out what is the best diet for our current circumstances you need to actually study how different diets impact health. And the results are clear - the best diet includes little or no meat (excluding fish).