What is rock sugar made of, and will eating it cause weight gain?

Rock sugar is a refined crystalline product derived from granulated sugar. It is traditionally used in Chinese medicine to tonify the spleen and stomach, nourish the lungs, and relieve coughing and phlegm. However, excessive consumption may lead to weight gain. Therefore, patients should consume sugar-containing foods only in small and moderate amounts. When large quantities of sugar are ingested, excess sugar is converted into fat and stored in the body, contributing to weight gain. Moreover, individuals with diabetes, hypertension, or other related conditions must strictly limit their sugar intake to avoid exacerbating their condition.