Blueberries – Anthocyanin-rich blueberry juice improved cognitive function and memory in aging adult humans. Purple tomatoes – In addition to carotenoids, purple tomatoes also contain significant levels of anthocyanins. Blackberries are rich in flavonoid pigments with in vivo evidence of protection against neurological degeneration and bone loss. Apples and onions – A light yellow pigment, quercetin is found in apples and onions. Red and yellow onions are high in quercetin.