The Diet and Health Trends That Don’t Hold Up to Scrutiny

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Wellness culture moves fast, and it has a habit of repackaging the same handful of ideas every few years with a new name and a higher price tag. Some trends are genuinely useful. Most are marketing dressed up as biology. Here’s a look at the ones that come up again and again, and what the actual science says about each.

Alkaline Water

The pitch is simple: regular water is too acidic, so drinking water with a higher pH will “alkalize” your body, boost energy, and prevent disease. The problem is basic chemistry. Stomach acid sits at a pH of roughly 1.5 to 3.5, dramatically more acidic than even the most aggressively alkaline bottled water. The moment alkaline water hits your stomach, it gets neutralized in minutes, and your body’s buffering systems, mainly your lungs and kidneys, keep your blood pH locked in an extremely narrow range no matter what you drink. Large-scale reviews comparing alkaline water to ordinary water have found no meaningful difference in hydration, gut bacteria, or fitness outcomes in healthy people. It’s not dangerous, but it is an expensive way to drink water that does nothing your tap water wasn’t already doing.

The “Detox” and “Cleanse” Industry

Detox teas, juice cleanses, foot pads that turn black overnight, coffee enemas. The shared premise is that toxins are building up in your body and need to be flushed out with a special product. In reality, your liver and kidneys already do this job continuously and effectively, without help from a tea or a $60 juice subscription. Most “detox” products that produce a noticeable effect are doing so because they’re laxatives, which create the sensation of “cleansing” without removing anything your organs weren’t already handling. If a product claims to remove vague, unnamed toxins, that’s usually a sign the underlying mechanism doesn’t hold up to scrutiny.

Protein, Protein, Everywhere

Protein has become the marketing word of the decade, showing up in chips, coffee, pasta, popcorn, and water. Some of this is a real response to genuine needs. Older adults, people recovering from surgery, athletes, and people on weight-loss medications that reduce overall food intake often do need to prioritize protein to avoid muscle loss. But for the average person eating a typical diet, protein deficiency simply isn’t a widespread problem. Most people already get more than enough through ordinary meals. What’s actually lacking in most diets is fiber, and ironically, the same processed snacks now being reformulated with added protein are often still low in it. Tracking grams of protein on a bag of chips can distract from the much more consequential gap: most people don’t eat close to the recommended daily fiber intake, and that shortfall is linked to a range of long-term health problems, including digestive issues and elevated colon cancer risk.

Carnivore and Extreme Low-Carb Diets

Diets built entirely around meat, or built around eliminating entire food groups, tend to produce fast, visible results, mostly water weight loss and reduced bloating in the first few weeks. That short-term feedback is part of why they’re so persuasive. But the long-term picture is more concerning. Diets that eliminate plant foods entirely cut out fiber almost completely, and fiber plays a documented role in lowering cholesterol, feeding beneficial gut bacteria, and reducing colon cancer risk. Several clinical reviews have flagged elevated LDL cholesterol, nutrient deficiencies in vitamin C, calcium, and magnesium, and increased long-term cardiovascular and cancer risk associated with diets this restrictive. None of this means animal protein is bad. It means a diet with zero plant matter removes protective elements that the body relies on, and the consequences of that tend to show up over years, not weeks, which makes them easy to miss or misattribute.

Gluten-Free Without a Medical Reason

For people with celiac disease or a diagnosed gluten intolerance, gluten-free eating isn’t a trend, it’s a medical necessity, and the explosion of gluten-free products over the past decade has genuinely improved quality of life for that group. The issue is the much larger number of people avoiding gluten with no diagnosis, on the assumption that it’s inherently healthier or causes inflammation in everyone. For people without celiac disease or a sensitivity, there’s no evidence that cutting gluten improves health outcomes. Often what happens instead is a processed, gluten-containing product gets swapped for a processed, gluten-free one that isn’t meaningfully different in sugar, fat, or overall nutrition, just more expensive.

MLM Health Products and Essential Oils

Multi-level marketing companies built around supplements, shakes, or essential oils follow a familiar pattern: a product with little to no clinical evidence behind it, sold through personal relationships rather than retail, with most of the profit flowing to recruitment rather than product efficacy. Essential oils in particular get marketed for uses well beyond their actual evidence base, including some makers and sellers implying they’re safe to ingest, despite many being explicitly labeled for external use only and capable of causing real harm if consumed.

Why These Trends Keep Coming Back

A few patterns show up across nearly all of these examples. They tend to offer a single, simple explanation for something genuinely complicated, like weight, energy, or disease risk, which is appealing because real health guidance is usually boring and multifactorial. They often borrow legitimacy from a real medical use case, like the ketogenic diet’s origin as a treatment for drug-resistant epilepsy, then generalize it to a population that has nothing to do with the original purpose. And they’re frequently profitable enough that the people promoting them have little incentive to highlight the limits of the evidence.

None of this means every new health idea is bunk, or that the people who try these trends are foolish for being drawn in. Plenty of legitimate, well-supported health advice sounds almost identical in marketing terms to the nonsense: eat more plants, move your body regularly, get enough sleep. The difference usually isn’t in how a claim is phrased, it’s in whether there’s a body of independent, replicated research behind it, or just a testimonial and a price tag.