That is good advice to help you spend less money.
For me, after having so much of those on my AT thru-hike and on the PCT -- I'm gagged just by reading the text describing those items. Particularly the Ramen Noodles and Lipton's Noodles and Pop-tarts (although I ate tons more of those on the PCT than I did on the AT). I'm glad my maildrop support person on my AT thru-hike was able to mix/vary the contents of maildrops she'd sent me on the AT so I always had something good to eat to offset the lightweight food items that gag me now.
I'm just recently beginning to be able to eat hot dogs after my buddy Tony and I ate so many hot dogs in college.
You should let your folks know that they can send you some goodies in the mail that you can't normally find in trail towns for resupply. Variety is the main thing (you'll eat anything not tied down as a pet but it would be good if you could get some variety -- mainly things heavy with fat is what you'll be craving).
Datto