In the mid 90s an old mate showed up one day, very yellow, and asked about a conversation we'd had years previously. As well as suffering from hepatitus he'd recently been diagnosed with diabetes. The old conversation was that some people thought that diabetes was an entirely voluntary condition, simply change your eating habits and it goes away, he wanted to know how to find these people. He found them and within a couple of months his diabetes was on it's way to being cured, in 2016 I even heard of a Doctor taking this route, although he'd been happy till then to use the usual protocol with it's grim prognosis on his patients.
It turned out that there was a sort of last chance saloon of cancer sufferers exploring diet as a 'cure' once their doctors had tried everything else, he hung around in this community for a long time taking in Indian/Chinese/Japanese approaches to health. His thinking was since he was getting progressively worse from his diseased liver perhaps there was something further to be gained. What he noticed was that among those people who had mastered their dietary discipline, which was close to the anti-diabetes protocol, occasionally someone would get ill with a viral infection, which would get quite serious, but then they would emerge in remission. This gave others hope.
His take on it was that virus' were like fungi in the forest, but cleaning up stressed/sick cells instead of deadwood, and that cancer cells 'saw' insulin and adrenalin as growth hormones and the best way to 'stress' those cancer cells was to starve them of sugars and growth stimuli. Once stressed they'd be attacked by virus' and cleaned up by the immune system, but what would a milkman know of such things? That said pushing 70 he's still clear of hep. which was his goal.