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This report is a little lacking, here is a PDF of the study http://media.nzherald.co.nz/webcontent/document/pdf/201640/C... from the nz herald. And their take on it http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objecti...
(Regarding Fibroblast growth factor 21 (FGF21))

key quote: " the metabolic outcomes associated with elevated FGF21 depend on the nutritional context, differing according to whether the animal is in a state of under- or overfeeding."

The news article badly misinterprets the results in implying that low protein alone = high FGF21 = longevity.

In that case, what's the correct take away from the study? fasting + low protein + high nutrient diet is best?
can we get away from the idea that a single kind of diet is always best ? Sometimes one needs protein (e.g. after intense physical exercise), sometimes fat (in the winter maybe), sometimes carbs (long cycle ride), usually veggies. Eat as appropriate.