We have commented on the subject of the human diet and health before, but it's time for another comment, because the NYT Science Times has written on it.
"Healthy food" has been an on-and-off American obsession, comparable to the obsession with flavor in France.
Since Rev. Sylvester Graham, a minister, vegetarian, and food-obsessive invented the Graham Cracker in the 1820s to provide "digestive fiber," Americans have been food faddists and vulnerable to food quackery.
More famously, Dr. John Kellogg of Battle Creek, Michigan, an 1870s charlatan with a diet fad, fooled Americans into thinking that cereal was breakfast food. It is not. In Yankee-land, breakfast is eggs, bacon, sausage, toast, potatoes, fruit and apple pie.
Eat what you want, and be happy. All humans are prone to "magical thinking" - aka "wishful thinking." We'd like to imagine that we have some control over things like health, and that things we put in our mouths will make a difference. There is essentially no evidence for that idea, assuming absence of a disease, or a problem like high cholesterol, or pregnant, etc.
Even being fat doesn't seem to make any significant difference to health. (Being obese is a bad plan, though.) I advise patients to eat plenty of salmon, trout and char for their magical properties, and whatever else they want; to exercise and work out if they want to be strong and fit but not because they will live forever; to lose weight if they want to look better and feel less tired; to eat all the salt and steak they want; and to avoid magical health diets. Vegetarian? Fine. Leaves more lamb and steak for me. Just don't imagine that it's about health. What's a healthy diet? Any average mix of stuff, but most of all - enjoy it, and don't fuss about it too much.
(Image from the excellent medical blog Kevin, MD. That steak could be a bit more rare, if you ask me.)