Where does “ruuanhaju” come from?

ruuanhaju (Finnish) comes from Finnish ruoka, from Proto-Finnic rooka, from Proto-Germanic rōkō — care, attention.

Ancestry of “ruuanhaju”, step by step

ruuanhaju traces back through two separate lines of ancestry.

via Finnish ruoka

StepLanguageWordMeaning
1Finnishruokafood; meal
2Proto-Finnicrookafood; meal
3Proto-Germanicrōkōcare, attention

via Finnish haju

StepLanguageWordMeaning
1Finnishhajusmell, whiff; clue, slightest idea
2Proto-Finno-Ugric*haju—
Every word from Proto-Germanic rōkō →Every word from Proto-Finnic rooka →Every word from Finnish ruoka →