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Olive leaves also contain other antioxidants such as hydroxytyrosol, luteolin, apigenin and verbascoside.

Brown and white fruits and vegetables are colored by a group of phytonutrients known as "flavones," including apigenin, luteolin, isoetin and others.

The majority of the research uses isolated apigenin and luteolin, not the foods that contain those compounds, and most of the research involves rodents or isolated cancer cells in a petri dish.

To be fair, celery does contain some phytochemicals, notably apigenin and luteolin, that may have antioxidant, anti-inflammatory and anti-cancer properties, but the research in this area is not quite ready for prime time.

Hultin points out we can also get apigenin from parsley and lettuce, and luteolin from beets and cabbage.