Q: The recommendation for adults is to get around 20 to 40 grams of fiber a day — but that’s hard to do. Is it really necessary? — Francis T., Kalamazoo, Michigan A: You’re right that our drive-thru approach to food these days makes it difficult to ingest enough fiber to keep your gut biome happy, tamp down inflammation, and bolster your immune system. But that’s not only because so much of our food is over-processed or fiber-free. A report in the journal Science says that because of our modern eating habits, folks are losing the gut bacteria that can digest the cellulose in fiber we do eat….