PURPOSE: To obtain food and drink having vasopressor-suppressing action while utilizing original taste of tomato by reacting a glutamic acid decarboxylase with a treated material of ripe tomato and converting a part of glutamic acid contained in the treated material into γ-aminolactic acid.

CONSTITUTION: Glutamic acid (salt) is preferably added to a treated material of ripe tomato, preferably being water diluted material of tomato paste and a glutamic acid decarboxylase (preferably unripe tomato, Japanese pumpkin, carrot or radish) is reacted therewith, preferably at 15-30°C and pH4.0-6.0 and a part of glutamic acid contained in the treated material of ripe tomato is converted into γ-aminolactic acid to provide the objective food and drink.