Onions are more than a flavorful ingredient—they are rich in antioxidants, sulfur compounds, vitamin C, and flavonoids that may help protect cells from oxidative stress and support overall health. Regular onion consumption may benefit heart health, blood sugar control, bone strength, and immunity, while their anti-inflammatory properties may also help reduce the risk of certain chronic diseases. Adding around 30–50 grams to a balanced diet can be beneficial, but people with stomach sensitivity, low blood pressure, or other health concerns should consume them cautiously and consult a healthcare professional if needed.