Ask participants about 24 things and you are bound to find correlations that have no actual basis in fact for that sample size. They might have well have asked about their favorite colors and music while they were at it. This is an obviously bad study funded by industries that are not impartial, and really has no business being posted here.
I've heard similar statements in the past, but I think I lack the statistics knowledge to make sense of it. Would you mind expanding on that a little? I.e., suppose that 3 of the questions were meant to test some theory that the researchers have, and the 21 other questions were thrown in for the reasons stated above. Now suppose that the answers to the 3 seriously-chosen questions weren't predictive of long life, but…
Instead, a better study would consider actual science. Microbiology, biochemistry, etc and form measurable hypotheses instead of this spray-and-pray pseudoscience