Why the best doctor is yourself? The human brain has an amazing function: it produces its own hormone, endorphins*, which is an opioid-like substance that makes people happy. Endorphins can be obtained through exercise and by maintaining a happy mood. Keeping a happy mood and exercising every day will lead to a good and healthy body! This is what the saying “three parts cure, seven parts nourishment” means! Everyone has a very strong ability to heal themselves! So the best doctor is yourself!