As animals have evolved, the tastes that provide the most energy (sugar and fats) are the most pleasant to eat while others, such as bitter, are not enjoyable.
隨著動物的演化，那些可以提供最多能量的（如糖及脂肪）嘗起來最讓人愉快，而其他的（例如苦味）則有不好的味道。