Eating like our grandparents and great-grandparents may be a key to better health. Before the rise of processed foods, people ate diets rich in fiber, fermented foods and seasonally fresh produce, which helped ensure a well-balanced gut, says Shylah Schauer, a North Dakota naturopathic doctor who specializes in the gut-brain-microbiome axis. Why does the microbiome matter? Click here to learn more.