may 7, 1917 - 1917: Calorie counting, introduced by Lulu Hunt Peters. Made a book on calorie counting, called Diet and Health: With Key to the Calories. First weightloss book to become best seller. She was the first person to popularize that calorie counting was a method of weight lost.
Added to timeline:
Date:
may 7, 1917
Now
~ 109 years ago