Which foods are richest in Quercetin, which may improve memory and reflexes?

The foods richest in quercetin are indeed onions and apples. Quercetin is a flavonoid antioxidant known for its potential health benefits, including the improvement of cognitive functions such as memory and reflexes. Onions, particularly red onions, have very high amounts of quercetin, and apples, especially with the skin on, are also recognized as a significant source. This flavonoid is associated with various health properties, including anti-inflammatory and neuroprotective effects, making it a compound of interest when considering foods that may enhance cognitive functions.

In contrast, while other options do contain various nutrients and antioxidants, they are not as high in quercetin specifically. Carrots and potatoes primarily contain beta-carotene and other vitamins and minerals. Pineapple and mango are rich in different beneficial compounds, including vitamins and enzymes, but they are not notable sources of quercetin. Berries and grapes offer a variety of antioxidants but do not provide quercetin in the same concentrations as onions and apples. Thus, the focus on onions and apples as the richest sources of quercetin makes them the correct choice regarding this question.