The acidity and alkalinity of food materials in various menus was determined to clarify the influence
of food on physiological functions.　Menus mainly containing alkaline food materials (alkaline
menu) and acid ones (acid menu) were compared.　Determination of acidity and alkalinity was performed
for each food material in the alkaline menu and acid menu, and acidity and alkalinity of one meal and a day's one were estimated.
１.　Most of food materials in acid menu were assessed to be acid food, and those in the alkaline
menu were assessed to be alkaline food except staple food.
２.　The acid menus of ５ days in the test period were all assessed to be acid food.　The mean acidity
for a day’s meal was １．９５ and there was no difference in the acidity between ５ days tested.
３.　The mean alkalinity was ２.９７ for the respective alkaline menus for ５ days, but the acidity of the
first day was ０．５２.　After that, its alkalinity was gradually increased (２．０７ for the day-２ to ６．０３
for the day-５).　When it is needed to keep a day’s acidity or alkalinity constant, a menu should
be designed through determination of acidity/alkalinity of each food material and its content.