I relate to this so much!
We made the decision in July 2019 to transition to a whole foods, plant based diet for health reasons. This has impacted my grocery budget enormously! I no longer buy meats, cheeses, & dairy items, the most expensive items I was buying before. I generally try to only buy in-season fruits & veggies. Combine that with the base staples of this lifestyle being some of the most budget friendly items (rice, potatoes, quinoa, pasta), & my grocery budget has literally been chopped in half. Plus, although WFPB eating is technically vegan, we do not eat the "vegan" meats or cheeses due to them not being considered "whole food," which are the top price items for many vegans. I also pack my & my son's lunches every single day. This is for budget -- his hot lunch at school STARTS at $2.30 a day & I could easily spend upwards of $8 every day -- that adds up! -- & for the WFPB aspect -- his school's hot lunches have few, if any, vegan/ WFPB options to choose from, & I like to avoid being THAT person at a restaurant who has to ask about the ingredients in every dish so that acts as a big deterrent..!
We are certainly not fanatical vegans (we are a lot more flexible around the holidays & even cave to our cravings for a cheese pizza now & then), but on an overarching theme, I have been so pleased with my weight loss, my & my husband's health gains, my son's passion for healthy eating, & my drastically reduced grocery budget.
(If y'all are more interested in this lifestyle & its health benefits, check out the documentary Forks Over Knives on Netflix or their website https://www.forksoverknives.com/ -- they have a bunch of free recipes & articles about these benefits, or visit one of my favorite WFPB proponents on his website: https://www.drmcdougall.com/ .... this is no ad, I really do just love the guy's stuff!)