Onions are a staple food in many countries, liked for adding sodium-free taste to boring dishes. Although onions have a pungent smell, they contain powerful antioxidants that help prevent cancer in many organs like the liver and kidneys. They also have high fiber content, helping the digestion process move along smoothly. This also reduces the work that kidneys have to do.
Onions allow dialysis patients to maintain taste in their meals without having to use salt. The prebiotics in onions can also treat stomach worms. Onions lead to selenium production in the body, which improves the immune system and strengthens the kidneys.