In architecture we call this "precedent research", and though it's often undertaken as specific to a given project or design problem, it can also become a general process one adopts as a partially abstracted design / intellectual passion, in which one continually seeks and is enriched by examples of excellent, profound, radical or otherwise exemplary design, and which having internalized, then informs you at an unconscious level as you amass and synthesize more broad design literacy: this is why studying the architecture of Brunelleschi, Palladio, and Mies van der Rohe is still useful, and is not contrary to also studying more recent works from Tadao Ando, Renzo Piano, Louis Kahn and Zaha Hadid - it all helps to inform your underlying set of personal schemas and ideas about design, and to broaden your vocabulary of responses to specific design constraints and conditions.
That said, I love this phrase of yours: visual nutrition and with permission, I'd like to adopt its use!