"Eating" is an embodied experience depending a lot on the physiology and the environment of any given species.
Bacteria "eat", as do humans. Plants also take up additional nutrients through their roots besides the sugars they build via photosynthesis in their leaves. It could be argued, that this is the plant equivalent of "eating". Some of them have even closer analogies to animal-like eating. Carnivorous plants capture and digest a variety of animals they lure in and prey upon with a diverse set of strategies.
Nevertheless, each of these examples have a completely different approach and, therefore, experience of eating.
I could certainly come up with an entirely new mechanism designed to take in nutrients and energy carrying substances which some other species may use to obtain the materials it needs to grow, sustain itself, and reproduce. However, it would be difficult to truly separate such a novel mechanism from the broader idea of "eating".
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