Oat milk has become the go-to milk swap for a lot of women I work with, and I've got 4 reasons why I don't recommend it to my gut health clients. I get why it's tempting — it's always cheaper or on sale, and here's why: the big companies are producing it in bulk because it's popular right now, and popularity means low prices to keep you buying. It's creamy, it's easy to find, and it feels like the "healthy" choice sitting there next to the almond and cashew milk at the store. But if you've been pouring it into your coffee or smoothie every morning thinking you're…