The only known life is Earth life and it offers no other plausible ways of energy retrieval for species with high energy consumption (which seems to be required for the intelligence, since for Earth life large brains consume a lot of energy). However, if this species has an advanced technological civilization, then it is easy to imagine that they, although initially consumed food, could have modified their own biology to rely on some other way to get energy. For example, they could have modified themselves to entirely rely on nutrients supplied directly to their bloodstream. This would have several potential benefits: centralized production on nutrients probably would be more efficient than production of food that is latter being digested and without the digestion system the members of the species would be more agile. Although, probably most species would be hesitant to lose the ability to consume food, which normally should be a pleasurable activity for a naturally evolved species, one could imagine this as a drastic response to an ecological crisis.
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