For human beings, being able to distinguish the five basic tastes is an indispensable survival skill, because it allows us to avoid risky foods and obtain nutrients safely.By detecting the sour taste of organic acids in unripe fruit or rotting food, or the bitterness of alkaloids, for example, our tongue enables us to avoid danger. In contrast, when we detect the sweetness of sugars that serve as our energy source, or the saltiness of minerals necessary to maintain the balance of body fluids, we actively consume them.Umami meanwhile serves as a signal to the body that we have consumed protein. Sensing umami triggers the secretion of saliva and digestive juices, facilitating the smooth digestion of protein.Common examples of foods/taste substances for each of the basic tastes