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The universal entropy bound of Bekenstein is considered, at any strength ofthe gravitational interaction. A proof of it is given, provided the consideredgeneral-relativistic spacetimes allow for a meaningful and inequivocaldefinition of the quantities which partecipate to the bound (such as system'senergy and radius). This is done assuming as starting point that, for assignedstatistical-mechanical local conditions, a lower-limiting scale l* to system'ssize definitely exists, being it required by holography through itssemiclassical formulation as given by the generalized covariant entropy bound.An attempt is made also to draw some possible general consequences of the l*assumption with regards to the proliferation of species problem and to theviscosity to entropy density ratio. Concerning the latter, various fluids areconsidered including systems potentially relevant, to some extent, to thequark-gluon plasma case.

A proof of the Bekenstein bound for any strength of gravity through holography