During my hike i would always add in coconut oil and hemp protein powder to the different goulash and schlopps we cooked tossing in stuff (had to rely on my hiker boxes for these type of items). being my first long distance hike it was a learning experience and some had it down to science but everyone's body's different so it involves many test runs to perfect a meal plan that you can stick to for the whole hike with no wast or excess.
I know how easy it is to resupply on the AT with the shops and stores, and my goal would be to max out my miles (for record setting) so town visits would be supper minimal. Also being vegan there does come limitations for resupply options, but i have only done two months with the Raw meal replacements on my bike ride earlier during the winter and only used when i wasn't in/around a town i could find some thing to eat. I know being a Vegan hiker sounds F'd up XP but i'm thinking it should be possible, there are a variety of things i can to to the powders to change things up, and fresh fruits/veggies to get in town. (but hopefully i could discipline myself for eating the same sludge mix every day as an effective system and may have some benefits if hiking in bear country on the CDT (dont know if a bear would eat the meal replacement powder)