Not so much more in amount, but more variety.
I haven’t seen the documentary, but there is also a lot of talk about pre and probiotics. Mostly through fermented foods.
There is a lot of information in this article. Eating 30 plants a week will strengthen your gut. Here is how to start with every meal | Fortune Well
I posted a long time ago about eating 30 plants a week. I still tend to do that just because most of my diet is plant based and I like a large variety of fruits and vegatables. How many plants do you eat a week?