The caveat in paragraph number 19

This is what they found: by the time you get to a story length of 8 to 11 paragraphs, on average, your readers read only half the story. A minority will make it to paragraph number 19, where, on this occasion, a fraction of the readers of the Daily Mail would have discovered that the central premise of the news story – that a new trial had found a 40% reduction in cancer through intermittent dieting – was false.