The present invention provides a composition comprising a green-yellow vegetable (e.g., broccoli, spinach, parsley, komatsuna (Brassica rapa L.), Japanese radish leaves) and a light-colored vegetable (e.g., lettuce, cabbage, celery), the composition having the following effects: (1) inhibiting the generation of blood lipid peroxide； (2) lowering blood TBARS levels or suppressing the elevation of blood TBARS levels； (3) increasing blood vitamin E levels； (4) enhancing blood antioxidant activity； (5) enhancing blood TRAP levels； (6) lowering blood active oxygen levels or suppressing the elevation of blood active oxygen levels； and (7) preventing or treating diabetic complications.
