If you believed the internet, you'd think there's huge debate over whether eggs, coffee, or salt are good or bad for you. In reality, there's significant agreement on diet and health issues among experts, but the general public is conflicted. So why are we so confused when experts agree? Let's clear the air.

If you asked most people about foods that are "good" or "bad" for you, you'd get a dozen different answers. You'd find people who vehemently argue that eggs are both good or bad for you, that sodium does and doesn't contribute to hypertension, or that carbs do or don't make you sick. In general, you'll find a lot of laypeople with opinions that may or may not be based in real science. Researchers however, generally have some pretty solid opinions on these issues, and are quick to note where their own shortcomings are.

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So where's the disconnect? In this post, we'll look at where the breakdown happens, who's to blame, and what you can do about it all. We sat down with a number of our own experts to get their input. It's going to be a bumpy ride, so let's get started.

The "Health and Diet" Industry Carries Much of the Blame

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Americans spend billions on health and diet products every year. From books and meal plans to prepackaged foods and DVDs, we eat the stuff up (pun intended). It's natural to be attracted to any path that promises big results for little effort, but there's more to it. People who would otherwise consider themselves rational are often duped by marketing and half-truth statements made in the name of science.

This is where the diet industry flourishes. By taking advantage of the public's desire for practical health information, so-called "experts" sell us everything from juicers to supplements, convincing us the whole time we'll live forever thanks to their advice. It shouldn't work, but it does. Beth Skwarecki, a science writer and educator, explains why:

We respond strongly to warnings about danger, and promises of really awesome stuff (like health, or weight loss)—but only if those warnings or promises are actionable. And with food, that really applies: We can act on a warning to avoid gluten or eat superfoods (or whatever) at our next meal or our next trip to the grocery store. It makes us feel good to have control over ourselves. I'm not a psychologist and this is just my personal opinion, but I'm sure there is research that backs this up.

Why this causes confusion: Truth and falsehoods are both presented this way. “Vitamins are magical substances that will make you more healthy if you are deficient!” Well, yeah. That's actually true. “Vitamins are magical substances that will make you more healthy!” Sounds similar, but it's not the same, and it's not true in most cases. Then you can substitute various other chemicals or superfoods for the word "vitamins" in that sentence. True claims and misleading ones sound very similar. People selling diets or exercise programs will latch on to true things that help them sell their product; they'll also latch onto false ones. Just look at Dr. Oz: plenty of what he's pushing is true, but lots of it isn't, or is misleading. Which is which? I don't know that he cares. He just needs a steady stream of things to endorse.

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We don't mean to single out Dr. Oz here. There are a number of physicians and other medical professionals who are highly educated, but have made the decision to "sell health." They may believe they're doing good, or just want to make a living. In all of those cases, the message is similar: "Living healthy doesn't have to be hard, just do this thing/eat this food/buy my book."

Selling health is only half of the job. The other half is undermining public trust in science-based medicine and traditional authorities (although they carry blame too—we'll get to that in a moment) so they can swoop in to the rescue. Andy Bellatti, registered dietitian and frequent Lifehacker contributor, explains:

The food industry thrives on confusion, and it loves to propagate the notion that "Gee whiz, one day you're told coffee is good for you, the next day you're told it's unhealthy!" By making nutrition advice seem "confusing," they attempt to gain the public's trust.

It also doesn't help that, increasingly, food companies are setting up "institutes" (i.e.: Coca-Cola's Beverage Institute for Health and Wellness, General Mills' Bell Institute) that are essentially PR efforts that oh-so-coincidentally frame these companies' products as healthful (or, in the case of soda, in no way problematic from a health standpoint). To make matters more confusing, these institutes have doctors, cardiologists, and dietitians on their payroll—as well as key media contacts—resulting in a health professional talking to media about, say, how soda is "unfairly vilified." Most times, the general public isn't aware that this isn't an objective health professional choosing to say that.

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When we debunked stubborn exercise myths, we ran headlong into one of these groups. The "Gatorade Sports Science Institute" has papers explaining why Gatorade is better than water for exercise—papers we saw copied word-for-word on other sites. In reality, depending on the exercise you do there's either no difference between water or sports drinks, and for most people (and for moderate exercise) there's clear evidence that water is the better option unless you're doing for bouts of prolonged exercise.

All of these tactics may seem underhanded, but they're just part of the marketing game. By playing on the public's confusion and presenting their own products as quick fixes they convince us to buy their books, follow their diet plans, and perhaps most dangerously, ignore legitimate advice and real research.

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It's not just companies that do this though. Individuals with a message to sell also do it. Skwarecki's article, Why It's So Easy to Believe Our Food is Toxic, is an exceptional case study in this. She explains how "experts" take good premises—like the need to take your health in your own hands and be critical of the things you eat and buy—and go off the rails when the sales pitch gets involved. She calls out nutrition gurus and health "experts" you've likely seen reposted on Facebook, like Vani Hari (aka The Food Babe,) and Joseph Mercola, among others, who thrive on obfuscating nutrition so much that the only clear thing they do suggest is that you should buy their books, sponsored foods, and DVDs.

Food industry marketing firms and "diet guru" salesmen both use the same tactics, and both groups make money from your fear and lack of knowledge about health. You should treat both with the same skeptical eye, even if one's message is more attractive than the other.

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Corporate-Influenced Government Writes the Guidelines

The diet industry only shares part of the blame here. Much rests squarely on the shoulders of our government. We're not talking about a political party or person. This problem extends back for over 50 years, and it's not just an American problem. Our dietary guidelines and food industries have far-reaching global impact. People in countries around the world aim to adopt a more luxurious, first-world lifestyle, and that includes all of the food products available in countries like ours. Our industry reps are at the table when writing trade agreements. Nutrition scientists however, are not.

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Dietary guidelines issued by government agencies responsible for food (largely the USDA) have changed over the years. They now focus less on foods and more on nutrients, which has three big problems:

A "balanced diet" has transformed from a selection of foods and portion suggestions into a concoction of nutrients that people have to "make sure they're getting enough of," (which they would anyway with a balanced diet.) It's led the public to panic over specific nutrients and ingredients in our foods. So-called "nutritionism" has led to the low-fat craze, the salt-is-evil scare, and the eggs-cause-heart-disease panic, all of which have been largely refuted (with special cases excepted.) The people responsible for dietary guidelines are directly at odds with (and often influenced by) food industry groups, agricultural companies, and other businesses with a massive stake in making sure you eat the food they pack and sell—and they're willing to spend politically to make sure the government recommends their products.

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Just like money can buy influence in politics, it can buy influence in dietary guidelines. Kamal Patel, director at Examine.com, a site that aims to bring relevant studies to nutrition topics, explained the connection this way:

The USDA created the food pyramid to encourage a healthy diet, but the USDA also has a mission to encourage agricultural products grown in the US. There can be a LOT of conflict between those two goals. So the food pyramid (ahem, I mean "MyPlate") is not simply an objective summary of the available evidence. In fact, if the dietary guidelines had to go through peer review, I'm not sure it would be accepted for publication.

Speaking of the dietary guidelines...some people are of the mindset that they don't really matter. Nobody really reads the whole guidelines document, unless you're a researcher or just really into nutrition. But the guidelines are actually hugely important. Who's the biggest provider of food in the US? It's not McDonald's. It's the US government, by far. They provide food for the school lunch program and for over a million military members, in addition to subsidizing food for people with low incomes and a variety of other groups. And that's outside the indirect effect the guidelines have on physicians, who then inform their patients, who often aren't Lifehacker types who do their own research but rather just do exactly as their doctor directs. Or at least attempt to.

Equally important is the huge size of supplement industry and the food lobby. Farmers have little to no power compared to Unilever, General Mills, etc. They made it so that packaged foods are the norm, food and supplement marketing has become insane, and whole foods have lost out big time. In the beginning days of the food pyramid, they were using the slogan "Eat Right". Kraft used that slogan, so they told the government to stop, and they did! Companies always win. A few more examples: Government policy favors packaged foods that can display health claims (e.g. Granola bars, Lunchables) rather than natural foods that come loose or in clear plastic (e.g. strawberries, chicken thighs). Grains were originally 2-3 servings per day until food companies complained and they more than doubled the recommendation. Fruit and veggie manufacturers make very little money compared to General Mills and Unilever, so it took the National Cancer Institute to step in and tell the first-draft writers for the food pyramid that they really need to bump up the fruit and veggie intake. Even the person in charge of the first pyramid, Louise Light, wrote a book about how screwed up the process was by industry and differing interests. She said that the grain-based pyramid would cause obesity and diabetes, and it did. The people in charge told her that fruits and veggies are kind of interchangeable with grains, plus grains are cheaper for food stamps. Although few if any researchers are out to lie to the public, note that for the 2000 Dietary guidelines committee, 6 out of 11 members had financial ties to food and agriculture manufacturers. Researchers have pet projects and advocate for them, and funding and careers are dependent on that.

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When Patel explained this, I asked how the government—probably the closest thing to a trusted resource—could re-shape its recommendations. He explained:

A better way to form the guidelines may be to avoid focus on individual nutrients (since few nutrients are categorically good or bad, other than manmade trans-fats which are always bad) and rather encourage whole foods. But if that message was the basis of a more simple guideline, and processed packaged foods were discouraged, where would that leave General Mills, Monsanto, and Unilever? Not that they directly write the guidelines, but they have lobbies and fund studies. And the government allows them to label Fruity Pebbles as healthy, just because they add some sprinkling of vitamins into the sugary mix. One last reason why it's good to focus on foods rather than nutrients for recommendations: single vitamins often fail in trials. Researchers used to think that vitamins E and A may protect against disease if supplemented. Dozens of trials later, it turns out that both may slightly lower lifespan or cause a bit more disease. One reason is that nutrients work in concert — eating a healthy diet where the foods naturally have a variety of nutrients is probably a better idea than relying on supplements to save you from a crappy diet. Indeed, there are no "superfoods" or "supernutrients"...it's probably more important to eat a natural diet that has some of each nutrient in addition to some healthy plant and animal components that aren't classified as essential nutrients (these are good/great for optimal health, but not technically necessary to live).

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Unfortunately, that won't happen as long as major food industry groups play a significant role in drafting nutritional guidelines. This isn't to say they're not at all useful, but they should be viewed with a skeptical eye. Alannah Dibona, frequent Lifehacker contributor, MS in Nutrition Studies and registered dietitian, sums it all up:

We humans are experts at changing our minds, issuing inaccurate self-reports, and, well, living. Dr. Walter Willett of the Harvard School of Public Health explains this beautifully alongside other issues with nutrition research in his latest book "Eat, Drink, and Be Healthy: The Harvard Medical School Guide to Healthy Eating." Dr. Willett takes care to point out another major factor: in this country, nutrition research for governing bodies is frequently in direct conflict with agriculture and its stake in the economy. The research that contributes to the USDA food pyramid, for example, is largely funded by grants from the dairy and beef industries. Thus, dietary "recommendations" from different bodies should be examined with a critical, research-oriented eye. The consumer must ask, "Who paid for this?"

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The Media and the Scientific Community Communicates Poorly

So we've established that money talks. But surely science-based medicine must offer useful data that we can all use, right? Not quite. When I asked Skwarecki about it, she explained it this way:

The other reason there is confusion? Because there really ARE old beliefs that were held as true that are being corrected. Saturated fat is a subject with genuine controversy. Experts have not come to a consensus, but decades of public-health messages are in the process of being potentially overturned. When you hold to something as a foundation (Of course fat is bad for you! Of course stretching prevents injury!) and that belief gets challenged, you're tempted to give up on everything. It's a very reasonable thing to do: My facts were wrong, I need to reevaluate all my facts.

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The truth is, while there's consensus on many things, there's a huge lack of it on others. Epidemiology, or the study of the patterns and causes of disease, is extremely difficult to do. Says Patel:

Nutritional epidemiology is a really, really tough thing to study. Harder than most other areas of health. Much harder than it sounds. Some people think "Oh nutrition! I know about food and nutrition! That's much easier than some analyzing some obscure medication that I can't even pronounce." Wrong. Medication effects can be complex, but nutritional epidemiology makes that look like child's play. ... It's easy to see how the public can get mixed messages. Research results are notoriously unpredictable, since only some of the total number of studies get published. Studies have a higher chance of getting published if they show positive results, and food and supplement manufacturers can keep funding trials until one gets published. Nutrients interact with each other, so the effects of any one nutrient are hard to predict, let alone the effect of any one food in the midst of a diet comprised of dozens or hundreds of foods. So while I don't agree with everything Michael Pollen says, his message is generally on point: "nutritionism" is bound to fail. If you obsess about your diet and individual nutrients, you not only lose the benefit of the occasional cronut or thanksgiving dinner, but you lose the forest for the trees. Natural foods are what's healthy, nutrients and the controversies they cause are what keeps research dollars flowing and flip-flops popping up every couple weeks. It's important to get nutrients, but it's wise to get them mostly through food, and only after that supplement what you need in a very targeted manner.

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In short, the science here is complex, difficult, and slow-moving. Patel explained that while there is consensus on some things, everyone's body is different. For every factor where there is agreement, there's another factor that influences everything:

There is a rough agreement that a balanced diet is probably a good idea. While there are some regular people who experiment with meat-only diets, macrobiotic diets, etc, most researchers are old dudes who eat normal diets and believe that veggies and fruits and whole grains are good, and red meat is bad, and some other things are in between. I'm just one person who has had the opportunity to make a career out of reading articles and grading their study quality — but I can honestly say that I don't know what is correct for sure. Gluten and wheat is bad for some people, low carb could help certain diabetics but so could a very nutritious diet, and low carb can also cause side effects in some people. Some people live long lives with "healthy" diets, some live long lives eating milk chocolate and fried chicken every day. For any specific nutrient, I can summarize the evidence. And for any type of diet, I can find the totality of observational evidence for it. But there haven't been many (any?) long term randomized trials of low carb, high carb, etc etc. It would be too expensive, deemed unethical, and just not logistically feasible for compliance — the primary researcher for long term observational trials (where they just follow people and collect data, not make them eat certain diets) often die in the middle of the trial, so it's quite an effort to keep a long randomized trial going that costs millions. Especially when food trials are funded at levels so much lower than pharmaceutical trials.

This is where the media comes in. Research that you hear about may be just one study designed to tackle a specific angle to a much larger problem. This is where the media (yes, ourselves at Lifehacker included) are at fault. Preliminary results published and popularized as cure-alls, rat cures touted as future human cures, it makes the public believe every miracle is a few trials away, and when it's not, people are frustrated and confused. This kind of poor communication and science reporting is a topic we've covered before in detail, and it plays a huge role in making the public's perception of science and medicine worse. As a result, it sends people running into the arms of diet hucksters and snake oil salesmen, eager to capitalize on that lack of trust.

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We Are Predictable and Easily Influenced

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We're part of the problem too. Our buying habits are predictable and easy to capitalize on. Our psychology is even predictable, and well studied by marketers. The power of the word "natural" to drive sales even though we all know it's meaningless is a good example, as is the fear around the word "processed" without context.

The scare over the "yoga mat chemical" (aka azodicarbonamide) is a good example too - we're poorly educated when it comes to science issues, don't read beyond headlines, succumb to confirmation bias, take up sides and arms in specific camps, and carry our message around to anyone who'll listen without listening ourselves.

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Similarly, where we put our money influences who has power and amplifies their message, even if it's not backed by science. We put our money where those opinions are, and those opinions are influenced easily. The industries and companies we support grow, even as we look elsewhere in the world for examples of healthy living. Those companies in turn export our lifestyle into new markets. Unless there's strength in the food traditions in those markets, they become more like us and suffer the same illnesses we do. In the process, they lose the very things we could learn the most from.

So What Can We Do?

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By now it may seem like we're pretty screwed. Where can you turn for legitimate advice? I asked our panel for their suggestions, and unfortunately they all agreed that we have to properly calibrate our bullshit detectors, and seek out multiple, trustworthy resources. Be ready for conflicting data—if you find it, it just means the topic isn't settled. The image above, from this pocket guide to bullshit prevention over at io9, is a good starting point.

You could ask your doctor, or a nutritionist—but Patel explained that's not always the best route. Most physicians get minimal nutrition training during medical school. A "nutritionist" could be anyone with a range of certifications, some of which can be earned in months without any real science study or knowledge. Even some registered dietitians (RDs) can unflinchingly toe the official government line just because it's easy and the closest thing we have to an evidence-backed recommendation, even though it's far from perfect.

When I asked Patel, he suggested everyone take time to learn about nutrition science and empower themselves:

It's best to learn a bit of basic nutrition science (like from a free online course or book—online courses from Udemy, Khan, MIT, etc), and then get to finding people who seem logical to discuss things with. These people can be at a local meetup, they could be a doctor or an alternative medicine practitioner or a dietician. Do not rely on Mayo Clinic, WebMD, etc. They are very conservative and go with whatever the government says for the most part. People who like food, who like cooking in particular, often eat healthy even if they don't know everything about nutrition. This is because eating plants and animals is probably the healthiest diet, rather than eating mostly packaged foods comprised of some type of flour, some type of vegetable oil, and a long list of other ingredients.

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Bellatti suggests you be critical, but also don't boil it down to the old adage, "everything in moderation." It oversimplifies things:

The basic principles of healthful eating—eat a generous amount of fruits and vegetables, eat as little sugar as possible, prioritize whole foods (i.e.: avocados and chickpeas as opposed to Lucky Charms and Cheetos)—have remained unchanged for decades. The issue of moderation is problematic because it sounds good in theory, but it has been so watered down and so co-opted by the food industry that it now means nothing. The food industry loves to use "everything in moderation" to state that all their offerings—no matter how heinous—"fit in a healthy diet." Alas, a diet that includes frozen pizza, sugary cereal, soda, chips, and fast food all in "moderation" quickly becomes a diet where these foods, "in moderation," take up the most real estate. I urge people to remain curious and open-minded, but also to remember common sense and, whenever possible, read the actual study or seek the opinion of a well-informed individual who is able to understand the studies. Sometimes, a study like "X food lowers diabetes risk by 35%" is based on a study where the servings needed to slash that risk are preposterous.

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At the end of the day, the reason why there's so much confusion is because there's too much to be gained by keeping us all confused and looking for guidance. Similarly, the fact that nutrition and health science is difficult and slow doesn't engender much faith from a quick-fix addicted public.

The big lessons here though are ones you probably knew already: Eat smart, cook your own food, and think critically when someone tries to sell you a diet or lifestyle. Think just as critically when someone is trying to sell you fear, uncertainty, and doubt. Do your own research, challenge your confirmation bias, and be willing to change your mind as new evidence arises (don't fall for the "I've done this my whole life and I'm fine" excuse.) Finally, and most importantly, remember that what works for you may not work for someone else. Nutrition is never a one-size-fits-all science.

Kamal Patel is the director of Examine.com. He's a nutrition researcher with an MPH and MBA from Johns Hopkins University, and is on hiatus from a PhD in nutrition in which he researched the link between diet and chronic pain. He has published peer-reviewed articles on vitamin D and calcium as well as a variety of clinical research topics. Kamal has also been involved in research on fructose and liver health, mindfulness meditation, and nutrition in low income areas. Examine.com and Kamal are both on facebook.

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Beth Skwarecki is a science writer and educator. Her work has appeared in Scientific American, PLOS Public Health Perspectives, and the Pittsburgh Post-Gazette. You can find more of her work in her portfolio here, and you can follow her on Twitter at @BethSkw .

Andy Bellatti, MS, RD is a Las Vegas-based dietitan and the author of the nutrition blog Small Bites. You can follow him on Twitter at @andybellatti.

Alannah DiBona, MA, MS, is a Boston-based nutritionist and mental health counselor, and the woman behind mindbodysportconsulting.com.

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All four graciously volunteered their expertise for this story, and we thank them.