The mock-newspaper The Onion put up an amusing article called "
Superfoods - Myth vs. Fact."
"M[yth]: Kale is a delicious way to meet your body’s iron needs
F[act]: Kale is a way to meet your body’s iron needs"
"M[yth]: Adding acai berries to your morning smoothie provides a huge antioxidant kick
F[act]: Chances are, if “your morning smoothie” is a recognizable part of your routine, everything’s going to turn out just fine in your life anyway"
Like all good, painful jokes on The Onion, it's rooted in reality.
Walnuts - and other healthy foods - can be expensive.
If you aren't used to eating certain foods (kale, for example), they aren't automatically interesting and delicious.
You have to actually consume flax seeds to benefit from them, which means buying and preparing them.
You need to have a habit of healthy eating before you can tweak those healthy habits to be even better.
You also need money and/or access to healthy foods, as discussed in this article on Precision Nutrition.
I've argued before that it's pretty easy to know what's good and what's bad. A shopping cart full of veggies and raw meats will beat one full of packaged snacks made with veggie powder and processed meats. But if you've got time-poverty, live in a food desert, or actually live in poverty, knowing the first beats the second is only part of the answer. Knowing is half the battle, as they used to say on G.I. Joe, but actually solving it isn't always trivial. It's a painful reminder that the playing field isn't level. Healthy eating something we all need, and something we can all strive towards. But it's not as trivial as just throwing in some "superfoods" to your diet.