The living foods diet is very particular about a food's "energy." Lai believes that foods derived from animals, processed foods and foods exposed to pollutants (including fruits and vegetables that have been irradiated, frozen, or grown with pesticides or chemical fertilizers) all lose their energy. Eating such foods is not only of no benefit to the body, but may even harm it.
生機飲食講求食物的「能量」，雷久南認為動物性及人工程序干擾或汙染的食品如：有農藥、化學肥料、輻射、冷凍保存的蔬果，都沒有能量，吃了不但對身體無益，反而有害。