Carya cathayensis, also known as longevity fruit, belongs to Carya genus of Juglandaceae, also known as thin-shell Carya cathayensis or long Carya cathayensis, and its English name is Pecan or Hickory. Carya cathayensis is native to the United States and northern Mexico, and has become one of the world's dried fruit trees.

Eating more pecans can nourish the skin and make people white and tender, especially the elderly. Carya cathayensis can also resist aging, treat neurasthenia and delay memory decline. Vitamin E contained in betel nut can protect cells from oxidative damage by free radicals, and it is recognized as an anti-aging substance in the medical field.

Treat gallstones. Pyruvate contained in Carya cathayensis fruit can prevent mucin from combining with calcium ions and unbound bilirubin, so that it can be dissolved, faded and excreted. Therefore, patients with gallstones may wish to insist on eating pecans every day, which may avoid the pain of surgery. Similarly, betel nut can also be used to treat urinary calculi.