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Onions and garlic are OK to feed occasionally, but shouldn't be fed all the time. when fed a lot of onions/garlic it may cause vomiting, diarrhea, and other digestive problems. And prolonged exposure can lead to a blood condition called hemolytic anemia, which is followed by respiratory distress and eventual death. However it does contain - lice, cardiovascular, antiviral, antibacterial, antioxidants, and anti-inflammatory benefits.
I will sometimes give a little onion or so, but it is not something they always have. Generally birds will look over onions anyway.
-Daniel