<human>:  Tell me about the 600 calorie a day diet Jackie Kennedy would go on.
<bot>: Jackie Kennedy was a well known American first lady who was married to President John F. Kennedy. She had a very active schedule and was known for her style and fashion. The typical Jackie Kennedy diet consisted of about 600 calories a day, mostly from fresh fruit and vegetables. She often had small, healthy meals throughout the day and stayed away from processed foods. She also used some calorie-counting strategies, which was a fairly new idea at the time. She often exercised regularly and had a very healthy lifestyle overall, which along with her diet contributed to her svelte figure. Jackie Kennedy was also known for her charitable work, including serving as a United States delegate to the United Nations. She passed away in 1994.