a closeup of Shelley from an outdoor pic from 1979
Shelley divulged her some of her "slim 'n' trim secrets" in 1979. She told Midnight Globe in July of the year about her diet and exercise routine. She revealed that she got enough exercise daily by jogging and walking and if she's free, she'd go for a swim. She didn't starve her body of all good foods but, instead, stuck to a sensible diet of fruits, vegetables, fish and chicken. Occasionally, she would have a steak. Great tips.
a writeup about Shelley from 1979