I guess it depends per day, but being vegetarian, and loving to cook, I eat alot of veggies every day. I would say 500 to 1000g.
I live in Amsterdam so it would be impossible to forage this amount. I am still new to foraging in Amsterdam and have not found my preferred spots.
We spend time in Italy in the mountains a few times per year and I am also observing spots to learn if that could be good foraging spots. I still feel very unexperienced but already having the awareness and starting to notice plants is great!