2, promote digestion: lemon is rich in organic acids, and organic acids can improve the sensitivity of taste buds, but also promote the secretion of gastrointestinal digestive juice. Therefore, for people with loss of appetite, indigestion, nausea, vomiting, abdominal pain and abdominal distension, if they eat lemon properly, they can increase their appetite and promote digestion by supplementing organic acids. Promoting fluid production to quench thirst: For thirst, dry mouth and throat discomfort caused by the decrease of body fluid in the oral cavity, if lemon is properly eaten, it can promote fluid production to quench thirst, thus alleviating the symptoms of thirst, dry mouth and throat discomfort, and has the effect of promoting fluid production to quench thirst.