The idea is that, before we worry about nutrition (i.e., “instrumental food”) we’ve first got to HAVE food. Enough of it. Consistently. And it’s got to be acceptable to us (which, for some people, might mean not coming from the garbage, or meeting certain standards of preparation) and it’s got to taste reasonably good. A little variety is nice, too.
These are not silly little preferences that can be brushed off lightly — even “tasting good,” which seems to always be the first thing thrown out the window when someone decides to change their diet For Health Reasons.