"Oats have a lot of beta-glucan, which is a really important modulator of your microbiome," he says. That's right, eating or drinking oats keeps your gut healthy. Oats are also rich in vitamin E, phytic acid, and certain antioxidants that may help to reduce inflammation in the body.

Healthy Drink 2: Beer (Yes, Really)

Quarantine or not, having a beer now and then can take the edge off your stress levels. But it may have more benefits than just a gentle buzz. When it comes to beer, the hoppier, the better.

"Beer has hops in it," Bland says. "Hops are not only a bittering agent, but they are a bioactive member of the phytochemical families that stimulate insulin sensitivity and cause lipid metabolism."

Hops have been revered for their ability to help you sleep. You can get hops to extract on its own if you don't want the buzz (or calories) of beer. Consuming hops has also been linked to reducing the risks of metabolic syndrome.

But don't just grab any old beer. Look for something that's extra hoppy, says Bland. This flies in the face of conventional wisdom that you can get a "beer belly" or a gut from drinking beer. The moderate drinker appears to come out ahead. Studies on whether beer makes you fat are inconclusive since a moderate amount (17 ounces or less) does not appear to lead to increased body fat.

"Go for an IPA, because you have more of those isoflavones and humulones from the hops." But don't overdo it. "Just as with wine or tequila, it has to do with magnitude," he says.

No surprise that the father of functional medicine recommends balance.