Abstract: A cruciferous plant, cut pieces thereof, and juice of the plant and the cut pieces are subjected to at least one treatment selected from the group consisting of anaerobic treatment, 25 to 50° C. thermal retention treatment, and glutamic acid treatment, to enrich &ggr;-aminobutyric acid (GABA), thereby obtaining a cruciferous plant, cut pieces, and juice containing GABA in various concentrations. By performing microwave radiation, blanching, drying, and the like for the GABA-enriched plant and the like as required, dried powder of the cruciferous plant, the cut pieces, and the juice, containing GABA in a high concentration and maintaining green color, is obtained. Food material, medicine material, and feed made of the cruciferous plant containing GABA in a high concentration are obtained.

Abstract: A processed food excellent for activating superoxidase dismutase is disclosed. The food contains 30 to 70% by weight of barley, wheat, rye or oats; 1 to 50% by weight of water soluble dietary fibers; 1 to 10% by weight of oligosaccharides; 0.5 to 5% by weight of powdered lactic acid bacteria and 5 to 15% by weight of powdered green tea. A method of making the food and a method for activating superoxide dismutase using the food is also disclosed.