• A registered dietitian said habits to support a healthy gut can also protect your brain from aging. • She started eating more fatty fish, colorful veggies, and high-fiber carbs to prevent cognitive decline. • She also supplements with creatine to boost brain health, and stopped drinking alcohol by age 50.

Ashley Koff recently turned 52 and has been more focused than ever on eating right to stave off potential age-related cognitive decline since hitting the five-decade milestone.

"I've always taken care of my digestive health and I doubled down on that focus as a preventative for my brain," Koff, a registered dietitian, told Business Insider. "Your brain is like a mini ecosystem of the whole body."

Koff, who founded the Better Nutrition Program, is the author of the upcoming book "

See Full Page