Soy bean powder contains the nutrients phosphorous and nitrogen, which find their way into lakes and rivers after going down the drain and affect water quality. (The presence of too many nutrients in water causes overgrowth of oxygen-depleting algae, which choke marine life and severely reduce water quality.) Toxic materials are created indirectly.
黃豆粉則因含有磷、氮等營養物質，經家庭污水排放出去後容易影響水質，造成河流、湖泊的「優氧化」（水中太多營養物質，使得藻類繁殖過盛，用光了水中的氧氣，導致水中魚類生物無法生存，水質惡化），間接產生毒性。