If You Read Nothing Else

Naringin and naringenin is the bitter plant compounds behind grapefruit's blood-sugar and cholesterol research.

In small trials, half a grapefruit at breakfast helped with weight and how the body handles insulin.

Grapefruit famously interacts with many prescription medications — a rare fruit-drug relationship worth knowing.

Grapefruit is a relatively modern arrival in Iranian orchards, but it found a place quickly. Pink and ruby fruit from the Caspian belt has become a winter breakfast staple.

Known to botanists as Citrus × paradisi.