In May Pang's book, on her last meeting with John, she noted that he looked very noticeably thinner than the John she remembered. He reacted very firmly to her criticism by mentioning that she (May) needed to watch out for the 'sugar blues.'
John was quoting the above book, which became one of his favorite obsessions in his last years. Measuring his sugar intake and chastising those who ate too much sugar.
Dufty's book, released in 1975, became one of John's inspirations in his increasing obsession with his health. Here is a short synopsis of the book:
It's a prime ingredient in countless substances from cereal to soup, from cola to coffee. Consumed at the rate of one hundred pounds for every American every year, it's as addictive as nicotine -- and as poisonous. It's sugar. And "Sugar Blues", inspired by the crusade of Hollywood legend Gloria Swanson, is the classic, bestselling expose that unmasks our generation's greatest medical killer and shows how a revitalizing, sugar-free diet can not only change lives, but quite possibly save them.
If you are interested in reading this book to understand why John heralded it the way he did, it is only $6.99 on Amazon
and has received rave reviews by the critics and apparently the fans as well.