From the point of view of my 50 years of life experience, I've come to conclude for myself that different studies say different things because people are so very different, we're all individuals, with our own quirks and stuff, and I think it's sorta like chords on a piano keyboard - they're different notes, but they're all playing music - and it's the music that's made that's the important stuff. I like one song, somebody else likes another - or one study turns on a light bulb for me, another study might turn on a light bulb for somebody else. That's just how I see it, anyway!