Poonam Desai is an ER doctor with two decades of experience who studied and recommended daily practices for a long life to her patients well before it became her main focus.

In 2017, she officially started practicing longevity medicine, teaching patients the tools they need to structure their routines with living long and staying healthy in mind.

For her own health and wellness, Desai, who is also a doctor of osteopathic medicine, practices the habits that she typically suggests.

“Everything I’m doing, I want to optimize it,” she told CNBC Make It in March.

This includes upping her fiber intake: “Every single day I try to get at least 30 to 40 grams of fiber in my diet,” Desai says. The average American eats about half of that amount of fiber, if not less, according to Harvard Health Publishing which places the typical fiber intake at just 10 to 15 grams daily.