One of my favourites, La Faim (Hunger) is a 1974 Canadian animation directed by Peter Foldes. There’s so much going on in it, I could (and do!) watch it over and over, one of the first examples of Key Frame computer aided animation, it took a year and a half to complete.
The style and soundtrack are unmistakeably 70’s but I don’t think the quality or the relevance of the message have diminished over time. Contains some stunning drawing, which borders on the grotesque in parts and an ending that manages to scare the pants off me every time I watch it!