A group of medical professionals known as The Brain Docs is urging people to make a small but impactful dietary change that could improve brain health and lower the risk of depression: eat more fiber.
In a recent Instagram post, the doctors emphasized that “fiber is one of the most overlooked factors in brain health.” They explained that high-fiber diets support the gut–brain axis—a complex network of neural pathways and hormones connecting the digestive system to the brain—thereby playing a crucial role in mental well-being.
Urging their followers to consider the simple dietary adjustment, the experts noted that fiber intake is an accessible way to benefit mental health. “If you want to see these effects,” they wrote, “then there are some simple food items you’ll want to add to your shopping list.” Specifically, they recommend prebiotic-rich fibers, which nourish beneficial gut bacteria.
Fiber-Rich Foods to Add to Your Diet
The Brain Docs suggest incorporating a variety of foods rich in dietary fiber, many of which can easily be included in any meal or enjoyed as snacks. Some top options include:
- Leafy greens
- Broccoli
- Asparagus
- Onions
- Garlic
- Leek
- Bananas
- Seeds
- Nuts
- Oats
- Lentils
- Beans
- Barley
These foods can be mixed into salads, added to yogurts, or eaten on their own for a brain-boosting snack.
Scientific Evidence Supports the Link
Backing up the doctors’ advice is a PubMed study that explored the relationship between dietary fiber intake and mental health. The review included data from 18 publications, of which 15 focused on adults and three on adolescents, analyzing how fiber consumption affects depression and anxiety. (Note: anxiety results were excluded due to limited data.)
The study found a dose-dependent relationship between fiber intake and depression: the more fiber consumed, the lower the risk. Specifically, every 5g increase in daily fiber intake corresponded with a 5% reduction in depression risk among adults.
Vegetable-derived fiber and soluble fiber showed the strongest protective effects, while cereal, fruit, and insoluble fibers also offered benefits, though slightly less pronounced.
How Much Fiber Should You Eat?
Health experts recommend consuming 25–30 grams of fiber per day. If you currently fall short of that target, it’s best to increase your fiber intake gradually. Be sure to stay hydrated, as water helps fiber move through your digestive system effectively.
A small dietary change like boosting fiber intake can have wide-reaching effects on both physical and mental well-being, making it a worthwhile addition to your daily routine.