It represents an intangible resource for doing things. It started out as a way for someone with chronic illness to explain what they felt up to doing in a day. It spread to the chronic illness community and has since drifted into the mainstream.
It’s a good way to explain how certain activities might require little physical energy, but enough mental energy that someone can only handle so many mental tasks, which isn’t always apparent. Like talking on the phone takes little physical energy. But depending on who you’re talking to it could be incredibly draining, like being on the phone with insurance about procedures.
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