Sulfites are chemical compounds that contain sulfur and oxygen, commonly used as preservatives in food and beverages. They help prevent spoilage and maintain freshness by inhibiting the growth of bacteria and fungi. Sulfites are often found in products like wine, dried fruits, and some processed foods. Some people may be sensitive to sulfites, experiencing allergic reactions or asthma symptoms after consuming them. Due to this, food labels in many countries are required to indicate the presence of sulfites, ensuring consumers are informed. Common sources of sulfites include wine, dried fruits, and pickled foods.