A recent study that monitored the salt intake and ongoing health of 100,000 people discovered that those who were least likely to die from heart disease or stroke had a sodium intake of between 3 and 6 grams per day. Another 2011 study of patients with high blood pressure found that their risk of stroke and heart attacks increased when they consumed over 7 grams per day, butit also increased when the subjects consumed under 3 grams. In other words, the American Heart Association's 1.5-gram figure seems to put most people firmly within the salt danger zone, not out of it.

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I imagine the salt danger zone looks like this.

That's not too surprising, because according to a doctor who led an Institute of Medicine committee on salt consumption, 1.5 grams is the smallest amount of salt a human can consume while still getting the nutrients they need to survive.

So why is the AHA recommending starvation-level salt figures? It seems pretty harsh until you figure out what's really going on here. Much like a teacher who desperately sets 10 chapters of textbook reading every night in the hope that his lazy students will panic and at least skim a few pages, the AHA, knowing that Americans love salt, is presumably throwing out a low figure with the assumption that most people will ignore it anyway. And for the most part, they've been right: despite the AHA's decades of continued warnings, American salt consumption hasn't changed in 50 years.

But those poor, authority-trusting schmucks who actually did do all that reading in high school and are now genuinely trying their hardest to keep their salt at the 1.5-gram level? They might be hurting themselves more than if they'd just eaten those damn French fries.

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Just lick the damn ground already, nerd.

First, let's look at the difference between fat- and water-soluble vitamins and nutrients. Water-soluble nutrients like Vitamin C, B12, and folic acid usually need to be consumed daily, because your body will mostly just pee out the excess. Fat-soluble stuff like Vitamins A, E, and K, on the other hand, is absorbed into your body fat and then sticks around, like that old LiveJournal full of Firefly fan fiction that you forgot the password to back in 2007. If you consume too many fat-soluble vitamins, they can build up in your body like the torrid sexual tension in a Mal/Jayne fanfic, leading to vitamin toxicity.

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If you recover from Vitamin Toxicity, at least you'll have a good band name.

Of course, most people will not end up overdosed and twitching on their kitchen floor among a spilled pile of Flintstone gummies. Most of the time, the risks are more subtle. For example, men taking more than the recommended dose of Vitamin E have a higher risk of getting prostate cancer, while supplementation with beta carotene, a precursor to Vitamin A, has been linked to increased lung cancer in smokers. It's one reason many doctors recommend that unless you've got a specific medical reason to take vitamin or mineral supplements, you try to get your nutrients from food instead, or that you just curl up on your living room floor and give up because everything's going to kill you anyway.

Superfoods include boring stuff like kale and blueberries, but the label is also applied to newly popular exotic foods like quinoa and acai berry. If nothing else, these superfoods provide a handy shibboleth that allows health-food fanatics to distinguish themselves from posers: if you're ordering a meal at a hippie deli and actually know how to pronounce "acai" or "quinoa," the hippies will realize you're one of them and invite you back to their awesome ball-pit filled with tofu. Seriously, one of those words has more syllables than it should and the other doesn't have enough; try remembering which is which when you're ordering an overpriced smoothie.

This isn't about whether superfoods are really as good for you as their reputation claims: whether they live up to their fame or not, most of us could probably stand to eat more kale and blueberries. The issue here is that the sudden popularity of superfoods is fucking over the people who once relied on these foods as a staple crop.

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Maybe they'll get invited into the tofu ball-pit, though.

Take quinoa. Back in the day, this high-protein grain was consumed heartily in Peru and Bolivia and unheard of pretty much anywhere else. Then the world figured out that quinoa is awesome (it's high in protein, doesn't cause allergies, has the most nutrients per 100 calories of any grain, and can calculate Pi to 368 digits), and now it's on the shelf of every Whole Foods in America. Over the last 10 years, quinoa demand has risen 18-fold, a sharp increase in popularity rarely seen among food that hasn't recently had bacon added to it.

The sudden demand means that in Bolivia, a kilo of quinoa costs 10 times more than it did a decade ago, which is good for farmers who are growing the stuff. It's less good, however, for the people who used to buy it from those farmers and eat it. As a result of the higher prices, poorer Bolivians are turning to less-nutritious staples like rice and noodles, which might be why malnutrition is on the rise among children in quinoa-growing areas. Similar shit is going down with the acai berry, a fruit that grows in the Amazon rainforest. In these areas, acai is often ground into a paste with cassava or meat and used as a protein-rich staple food. Since the rest of the world discovered it tastes awesome in fruit juice, prices have risen massively, which is great if you're selling it but not if you needed that acai paste to feed your children.

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"We're just happy that your juice cleanse is going well."