FIELD: preparation of food products for prevention of diseases. SUBSTANCE: food product contains deuterium up to 111-135 ppm. The method provides for production of water containing deuterium in the amount of 111-135 ppm by the method of standard electrolysis and/or distillation, and the produced water used as nutrient solution in growing of algae or for irrigation of plants used in food industry. As a result, algae and plants with low content of deuterium, or water with deuterium content of 111-135 ppm is used in production of nonalcoholic beverages and beer. EFFECT: production of food products preventing development of tumors and eliminating tumors of nondetectable sizes. 2 cl