Most modern families are equipped with sofas. Soft and generous sofas bring convenience and comfort to people, but sedentary sofas also bring disadvantages to people. Research data show that it is a misunderstanding that people think it is comfortable to sit on a soft sofa. Because the soft sofa does not meet the requirements of human physiological health, sedentary soft sofa will lead to "sofa syndrome". Japanese behavioral experts published a paper entitled "On Giving Up Sofa", suggesting that sofa is too soft, which reduces the stimulation to human body; It also reduces the stimulation to the human brain. Over time, it will make the brain slow, the agility of thinking decrease obviously, mental fatigue, fatigue, backache and leg pain, and limb weakness. Moreover, the digestive system is prone to problems and symptoms such as anorexia appear.

In addition, when the indoor temperature is too low, sedentary leather sofa can also cause sciatica and hemorrhoids.

The side effects of sedentary sofas will be more obvious, because the organs of the elderly shrink and the body's resistance declines. Therefore, the elderly should not sit on the sofa for a long time.