Another example is grape seeds. They only have an effect if eaten on an empty stomach, since food proteins make them difficult to digest. Eating grape seeds after a meal can be useless.
又例如葡萄籽，在空腹時食用較佳，因為食物中的蛋白質會降低葡萄籽的吸收，若飯後才吃，很可能白吃。