Yes but there are a lot of people out there (like me) who live to eat and don't want it to be true that diet is important. We humans are masters at subconsciously dismissing facts that don't fit our agenda, even when we're trying to be open minded and scientific. It also doesn't help that even simple "cheats" on a diet can render it ineffective, which we then tend to interpret as "diets don't work for me" rather than "you can't 'cheat' on your diet"