
A 1923 cookbook contained directions for calculating the number of calories needed daily. It also provided an example of how to use the chart:

To see if the number of recommended calories has changed across the years, I used an online calorie calculator to estimate the number of calories needed by a 35 year old woman who weighs 125 pounds. The online calculator asked for height. I used 5′ 4″. I also indicated that the woman did moderate exercise 4-5 times per week. The online calculator said that she needed 1827 calories per day to maintain weight which is 423 calories less than the hundred-year-old estimate that 2250 calories were needed per day – but perhaps doing two hours per day of general housework back then required more calories than moderate exercise 4-5 times per week does today.

