But if this standard is applied then we end up with (imo) facially silly arguments like "a sandwich is an investment because I need sustenance to live and if I stop living I cannot work."
People don't usually say they will invest in something that will imminently be used up. It can be food, but only if you're going to hold onto it for a while, e.g. disaster prep. They do say things like "I decided to invest in a new suit." There is a rule here though I'm not sure what it is. Perhaps the etymology[1] is helpful (but also perhaps not and it's just misleading).
Anyway, this usage isn't necessarily rendered invalid because some domain has a more specific and contradictory definition, much as botanical fruits don't make tomatoes any less of a vegetable in the kitchen.
[1] https://www.etymonline.com/word/invest#etymonline_v_12190