1. Loaded With Antioxidants - In fact, they contain over 25 different varieties of flavonoid. Red onions, in particular, contain anthocyanins, special plant pigments that give red onions their deep color.
2. May Boost Digestive Health - Onions are a rich source of fiber and prebiotics, which are necessary for optimal gut health.
3. Reduce high blood pressure - Onions contain antioxidants and compounds that fight inflammation, decrease triglycerides and reduce cholesterol levels — all of which may lower heart disease risk.
4. Good for the cardiovascular system
5. Contain Cancer-Fighting Compounds - Eating vegetables of the Allium genus like garlic and onions has been linked to a lower risk of certain cancers, including stomach and colorectal.
6. Help Control Blood Sugar - Eating onions may help control blood sugar, which is especially significant for people with diabetes or prediabetes.
7. May Boost Bone Density - Though dairy gets much of the credit for boosting bone health, many other foods, including onions, may help support strong bones.
8. Prevents anemia because it helps regenerate red blood cells.

Adding more onions to your diet is an easy way to benefit your overall health.