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Superman photosynthesizes
(lemmy.world)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
In the original The Dark Knight Returns, Superman gets hit by a nuke and can't reach sunlight to recover. Instead, he absorbs a rainforest's worth of photosynthesis. That's probably not considered cannon, but it kind of backs up the idea that they're both using photosynthesis.