Sulfur-free sugar refers to sugar that has been processed without the use of sulfur dioxide, a common preservative used in the sugar industry. The use of sulfur dioxide in sugar processing is generally considered safe and is regulated by the FDA. However, it is not necessarily harmful to consume sulfur-free sugar. Sugar, in general, is high in calories and can contribute to weight gain and other health problems if consumed in excessive amounts. Therefore, it is important to limit your intake of added sugars, regardless of whether they are sulfur-free or not. It's better to opt for natural sweeteners like honey, maple syrup, or coconut sugar which are considered better for health. It's always recommended to consult a doctor or a dietician for specific advice on diet, especially if you have any health concerns.