In 2020, Botox (4.4 million), soft tissue fillers (3.4 million), and laser skin resurfacing (997,245) were the top minimally invasive, antiaging treatments performed in the U.S.

It seems that everyone wants to roll back the clock — often from the outside.

But it's more effective to reverse aging from the inside. What you eat, drink, inhale (or don't inhale), and pop (from supplements to illegal drugs) can keep you young or age you.

And there's an even more "inside" treatment that reverses aging (at least in mice): fecal transplants.

Research published in the journal Microbiome found that when gut microbes were transferred from aged mice into healthy young mice, the young mice ended up with leaky gut, which poked at their immune system and revved up inflammation in their brain and eyes.

In contrast, the older mice perked right up when they had a fecal transplant from a youngster. It reversed age-related problems in the gut, brain, and eyes.

While that old-to-young switch isn't available for humans, starting today you can make sure you have a microbiome that stays younger than your years. Here’s how:

• Eat fiber, which protects the integrity of your gut lining. Enjoy seven daily servings of fruits (berries) and vegetables (kale, red cabbage), and two to three servings of whole grains.

 • Don't eat simple and added sugars, simple carbs, and red meats (including processed). Within a week, each of those foods amps up inflammatory gut microbes that age you prematurely. 

• Exercise; it increases the number and diversity of beneficial microbes, and encourages a gut-brain dialogue that protects cognition.