I made it a point NOT to pig out before a trip, because I know I will feel sluggish and tired at the beginning of a trip, when I'm also carrying the heaviest load at the start.
+1 on the appetite loss over 10,000' elevation, or even on a multi-day at moderate elevation. Everyone is different, but my experience is that my appetite and taste buds completely reject repetitive and packaged foods (Cliff Bars, etc)
So for me, I have to diversify the menu to make it interesting, otherwise my comfort is to skip meals on the trails. I have to force myself to finish my food allocation.
After every trip, I keep a lessons learned list, and a list of what-worked, and what failed. For me - small bites of a big variety works best, as opposed a big meal of one variety. pretzels, smoked salmon, jerky, tuna and chicken in foil pouch, mixed bagels, single servings of fruit jams and jelly, single servings nutella I love you, pre-cooked rice with bacon and ground beef vacuum sealed, gummy vitamins, licorice candy, Altoid mints, olive oil and zaatar thyme oregano pesto on bread, hard boiled eggs, spam singles. I also go for pringles, and pre-popped popcorn that I stash in a no-crush disposable container such as the large Lysol wet-wipe tube containers.
On my first BP trips, I packed 3-4 lbs of food per day, obviously too much, now I aim for 1 lb per day to eat, plus 15% extra calories per day for emergency, but no more than 1 solid extra day of emergency food per trip.
The emergency food usually get allocated to BP trip buddies who reject the food they packed and start craving "what the other guy is having"