This is on HE forum and there's another variation on WL so as you guys are plant based you should excel at this.
Apparently by eating a diversity of plants improves gut health over quantity eaten and the optimum is 30+ so how many do you eat in a week.
Here's the post on HE
Here's the post on WL which I think is very good indeed:
So how many do you eat this includes all plants: fruit, veggies, herbs, pulses, seeds.