Why is the heart considered the third brain?

Why is the heart considered the third brain?

Studies have now shown that the heart is the body’s third brain, containing approximately 40,000 neurons that can sense, feel, learn, and remember. Like the gut-brain axis, the heart and brain are also closely connected via the heart-brain axis. The heart sends messages to the brain about what it needs, how the body feels, and more. When the heart is not in optimal condition, mental wellness problems may manifest and be misunderstood as issues with the brain when they are originating from the heart. MentaHeart is the first product of its kind to support mental wellness through the heart-brain axis. MentaHeart helps connect what we feel (heart/emotions) to what we know (brain/intelligence).