2. Eating rock candy has the effects of promoting fluid production, quenching thirst, nourishing yin and moistening lung, resolving phlegm and relieving cough, delaying aging, invigorating spleen and appetizing, tonifying middle energizer and benefiting qi. It has the effects of preventing respiratory tract infection, promoting gastrointestinal peristalsis, lowering cholesterol, caring skin, improving immunity and maintaining blood sugar concentration. It can also promote the excretion of toxins in the body, dilute the viscosity of secretions and promote the microcirculation of blood.