You simply cannot make such a distinction in any meaningful fashion. As a civilisation we've attempted to make food a pleasure at every opportunity, even when

You simply cannot make such a distinction in any meaningful fashion. As a civilisation we've attempted to make food a pleasure at every opportunity, even when constrained by scarcity or ethics. Foie gras is inefficient on every possible food production for energy/resource metric. So is Beef. Foie Gras is seen as a luxury product. So is steak. Comparing them is completely logical imo.