It's incredibly hard to gain weight by eating whole or minimally processed foods. The destruction and recombination of foods (and their food matrix) into ultra processed foods is one of the driving causes behind people eating more because the artificial textures and softness is one of the main drivers of over-eating, especially of high calorie foods.
I'd wager that people could replicate the same satiety induced weight loss (to a slower, but safer extent) through minimising ultra processed foods than GLP drugs.
It reduces your supermarket shop to about 10% of the store. Almost anything packed and transported is out of the question, as are entire rows of capitalism-driven junk food.
Eating healthy snacks through the day: handfuls of oily nuts (peanuts, cashews, macadamias), full fat smoothies and a lot of protein doesn't shift the scales.
We still end up buying some packed and transported food: Frozen blueberries from Chile, Spanish olive oil, dried herbs like tumeric, paprika etc but most meat/fruit/vegetables is sourced locally.