This article from the guardian gives the story of Professor John Yudin, who has eventually been proven to be correct about his research on sugar’s harmful effects. More recently Dr Robert Lustig has publicised his opinions on the same subject thanks to YouTube. This article goes into considerable depth about the history of the “is it fat or is it sugar that is the main cause of heart disease?”.
http://www.theguardian.com/society/2016/apr/07/the-sugar-conspiracy-robert-lustig-john-yudkin
Diabetes Diet 