Soylent Meal Replacement Drink Review

I tried Soylent years ago, and it tasted exactly like what it is: ultra-processed junk food.

Soylent started as a Silicon Valley experiment in 2013. A software engineer named Rob Rhinehart decided that food was an inefficient use of his time, so he blended together a bunch of powdered nutrients, lived on the mixture for months, and wrote a now-infamous blog post titled “How I stopped eating food.” 

Venture capital money poured in, and Soylent became the meal replacement drink for tech workers who’d rather optimize their lunch break than actually eat.

That was over a decade ago. The company has changed hands — it’s now owned by Starco Brands — and the product line has expanded into shakes, powders, protein drinks, and snack bars. 

But the core formula hasn’t changed in any way that matters, and the “nutrition” still comes from a synthetic vitamin premix rather than anything resembling real food.

Soylent did reformulate its ready-to-drink shakes a couple of years ago, and the “added sugar” number on the label dropped from 9 grams to 1 gram. But they pulled that off by swapping one industrial sweetener (isomaltulose) for another (allulose), which the FDA doesn’t require companies to count as added sugar.

Here’s the thing: humans didn’t spend hundreds of thousands of years evolving to drink engineered soy slurry out of a plastic bottle. We evolved by eating animals (including their organs and fat), eggs, raw dairy, raw honey, and seasonal fruit. 

Every one of those foods delivers nutrients in a form our bodies actually recognize. Soylent, on the other hand, delivers isolated compounds from industrial crops, held together with emulsifiers and sweetened with a chlorinated sugar substitute. That’s a shortcut to metabolic dysfunction, not good health.

The bottom line? Soylent isn’t food. It’s a NOVA Group 4 ultra-processed product, and the research on what UPFs do to the human body has gotten a lot stronger since I first wrote this review back in 2018. 

For example, a 2024 BMJ umbrella review covering nearly 10 million people linked ultra-processed food consumption to about a 50% increased risk of dying from cardiovascular disease — along with 31 other adverse health outcomes.

Below, I break down what’s actually in Soylent today, why each of its core ingredients is a problem, and what I’d eat instead the next time you’re too busy to cook.

What’s Actually In Soylent

Let me be clear about what you’re drinking when you crack open a bottle of Soylent. First, here’s a quick overview, with a deeper dive into each ingredient below.

Soy

As its name suggests, Soylent’s protein comes from soy protein isolate, which is what you get after an industrial process involving chemical solvents, alkaline washes, and spray-drying. 

And the raw material going into that process isn’t exactly clean to begin with: about 94% of the soybeans grown in this country are genetically modified to survive being drenched in glyphosate, and residues from that spraying show up in the finished product.

Soy also happens to be one of the most estrogenic foods on the planet – it’s loaded with isoflavones that bind directly to human estrogen receptors. 

Fat

The fat in Soylent is canola oil and high-oleic sunflower oil. 

To make canola oil, you crush rapeseed, wash it with hexane (a petrochemical solvent the EPA classifies as a hazardous air pollutant), then bleach and deodorize it at temperatures above 450 degrees. 

The finished product contains trans fats from that deodorization process, but FDA rules let anything under 0.5 grams per serving round down to zero on the label. So the bottle says “0g trans fat” and the consumer never knows.

Both of these oils are high in linoleic acid, an omega-6 fat that’s been accumulating in American body fat for decades — with levels up 136% over the last half century. 

I’ve written extensively about why that matters in my article on saturated fat vs. PUFAs, but the short version is this: the two strongest randomized trials ever run on this question both had their results buried for decades because they showed the opposite of what the dietary guidelines predicted. 

When the data was finally recovered and published, both showed that eating more linoleic acid increased the risk of death. 

I’ll say this: high-oleic sunflower oil is more stable than regular sunflower oil, and I won’t pretend otherwise. But comparing seed oils to each other is like comparing filtered cigarettes to unfiltered. 

The better question is why you’d choose any of them when animal fats — tallow, butter, ghee — come with vitamins A, D, and K2 built in. No seed oil delivers any of that, no matter how it’s refined.

Maltodextrin

Then there’s the maltodextrin, a cheap corn-derived filler with a glycemic index somewhere between 85 and 105 — which is higher than table sugar. 

Yes, that’s right: every Soylent shake spikes your blood sugar harder than if they’d just used regular sugar in the formula. 

On top of that, research has linked maltodextrin to gut barrier damage — it helps harmful bacteria colonize your intestinal wall and degrades the protective mucus lining, even in people without pre-existing gut issues. 

As someone who spent years dealing with IBS before I changed how I eat, that’s not something I take lightly.

Sucralose

Soylent’s primary sweetener is sucralose, and this is the ingredient I’d be most concerned about right now. 

I covered it in depth in my article on the dangers of artificial sweeteners, but here’s what caught my attention most: a 2023 study found that your gut actually converts sucralose into a compound called sucralose-6-acetate, and that compound damages DNA. 

The researchers said a single sucralose-sweetened drink could produce enough of it to exceed European safety thresholds for genotoxicity. 

Sucralose is in nearly every Soylent product on the shelf.

Vitamin Premix

Soylent markets itself as “complete nutrition” with 39 essential nutrients per serving. But those nutrients come from synthetic isolates, not from food. 

That matters because synthetic vitamins don’t behave the same way in your body, and the gap between “synthetic” and “natural” is bigger than most people realize. 

The synthetic form of Vitamin E, for example, has about half the bioavailability of the natural version. 

Similarly, synthetic folic acid requires a conversion step that roughly 40% of people can’t do efficiently because of a common genetic variant — meaning their bodies can’t even use what Soylent is giving them. 

And the scariest example might be beta-carotene. The two largest trials that ever tested the synthetic form (see here and here) had to be stopped early because it increased cancer rates.

The Bigger Problem: Soylent Is Ultra-Processed Food

Even if you set every individual ingredient critique aside, Soylent has a bigger problem: it is, by every meaningful definition, an ultra-processed food.

The NOVA classification system is the most widely used framework in nutrition research for categorizing food by processing level. 

Group 4 is defined by the presence of ingredients you wouldn’t find in a home kitchen — isolated proteins, modified starches, soluble corn fiber, artificial sweeteners, synthetic vitamin premixes, emulsifiers like soy lecithin and gellan gum. Soylent contains all of these. It is a textbook NOVA Group 4 product.

That matters because the evidence on what UPFs do to the human body has gotten substantially stronger over the last few years.

In 2019, Kevin Hall’s lab at the NIH ran the first-ever inpatient randomized controlled trial directly comparing ultra-processed food to minimally processed food. Hall et al. (Cell Metabolism, 2019) recruited 20 weight-stable adults and had them live in a metabolic ward for four weeks. For two weeks they ate ultra-processed food. For two weeks they ate minimally processed food. The two diets were matched for total calories presented, energy density, sugar, fat, sodium, fiber, and macronutrients. The only variable was processing.

On the ultra-processed diet, subjects ate roughly 500 calories per day more than they did on the unprocessed diet, and they gained about 0.9 kg in two weeks. They lost the equivalent on the unprocessed arm.

The same calories on the menu, the same macronutrient targets, and a completely different physiological response.

In 2024, the BMJ published an umbrella review by Lane et al. covering 45 separate meta-analyses on ultra-processed food and 32 different health outcomes. 

The sample size was nearly 10 million people. The result? Direct associations between UPF consumption and 71% of the health outcomes studied. 

Convincing (Class I) evidence linked higher UPF intake to about a 50% increased risk of cardiovascular disease–related death, a 48% to 53% increased risk of common mental disorders and anxiety, and a 12% increased risk of type 2 diabetes. 

Highly suggestive (Class II) evidence linked it to a 21% increased risk of all-cause mortality.

You don’t have to debate the linoleic acid hypothesis or the sucralose toxicology data to make the case against Soylent. You can just look at what category of food it belongs to and at what that category does to the people who eat it. 

The outcomes are consistently bad.

What About Huel, Ka’Chava, and AG1?

So, here’s the obvious follow-up question: if Soylent is a problem, are its competitors any better?

Huel is a plant-based meal replacement that pitches itself as a cleaner alternative to Soylent. It was acquired by Danone in March 2026 for around 1 billion euros (the same Big Food consolidation pattern as Soylent). Huel doesn’t use sucralose or soy protein isolate, which is genuinely better. But it still uses canola oil in its ready-to-drink line, sunflower oil powder in the Black Edition Powder, and steviol glycosides as the sweetener. In other words, it falls into the same ultra-processed category as Soylent.

Ka’Chava is the cleanest of the major plant-based meal replacements. It uses pea, brown rice, and sacha inchi for protein; coconut milk for fat; and monk fruit for sweetness. The marketing is good. The problem is that it’s still a 240-calorie powder slurry built on isolated plant proteins and a long list of added vitamins and superfood extracts. It’s a less-bad version of the same category.

AG1 isn’t a meal replacement. It’s a 50-calorie greens powder that costs about $3 per serving. It still ends up on lists like this because the company markets it adjacent to the meal replacement category. Goldman Sachs reportedly began exploring a sale of AG1 at a $2 billion valuation in April 2025, which tells you more about the venture money behind the category than it does about anyone’s nutritional needs.

The deeper issue is that all of these brands are answering the wrong question. They’re trying to make a slightly better version of an inherently flawed product category. 

Plant-based meal replacement powders are ultra-processed regardless of whether they use sucralose or stevia, soy isolate or pea isolate, canola or coconut. 

The right answer isn’t a cleaner powder. The right answer is real food.

The Market Is Catching Up

Worth noting: Soylent itself is in trouble. In August 2025, parent company Starco Brands disclosed in its SEC filings that there was “substantial doubt” about its ability to meet its financial obligations. 

Soylent’s nine-month gross revenue in 2025 was about 30% below the same period in 2024. The company has been pulling back from retail to focus on direct-to-consumer.

The CEO has publicly distanced the brand from the “tech worker who never wants to eat again” framing it built its reputation on. The audience that powered Soylent’s rise is now the same audience driving the anti-seed-oil, anti-ultra-processed, real-food movement. The Silicon Valley wellness culture that birthed Soylent has, in 2026, largely rejected the kind of product Soylent is.

That doesn’t mean Soylent goes away tomorrow. It means the market is finally catching up to what evolutionary biology has been telling us all along.

What I’d Recommend Instead

Here’s the thing about meal replacements: the actual problem they’re trying to solve isn’t nutritional. It’s logistical. You don’t have time to cook. You’re traveling. You’re between meetings. You’re at the airport. You forgot to eat lunch and now it’s 4 p.m. and you’re hungry.

That problem has much better solutions than a soy and seed oil shake.

Tier 1: Real food, with a plan

When I travel, I follow a simple rule. If I’m staying in an Airbnb with a kitchen, I go straight to the grocery store on day one and stock up — eggs, ground beef, cheese, full-fat Greek yogurt, fruit, raw honey if I can find it. If I’m staying in a hotel, I find the nearest steakhouse. I cover the full approach in my article on how to eat healthy while traveling.

For the “I forgot to eat lunch” problem, the same logic applies. Real food is rarely more than 10 minutes away. Two pasture-raised eggs scrambled in butter takes about four minutes to prepare. A ribeye and a sweet potato takes about 15. 

Compared to driving to the store to buy Soylent, the time math is closer than people think.

Tier 2: Animal-based portable options

For genuinely on-the-go situations, two products meet my standards.

Carnivore Bars: There are only three ingredients in the original flavor: grass-finished beef, beef tallow, and Redmond Real Salt. The honey variants add raw honey. Each bar runs about 400 calories with 20g of protein and 35g of fat. This is what I throw in a gym bag, take on a flight, or hand to my kids when we’re running between activities. They just launched an Apple Pie flavor in 2026 that’s become a family favorite.

MK Supplements Beef Liver capsules: If you’re drinking Soylent for the “complete nutrition” promise — the “39 essential nutrients per serving” pitch — that’s the use case where real liver beats a synthetic premix every time. Beef liver contains over 25 vitamins, minerals, and coenzymes in their natural food matrix. MK Supps capsules are 100% grass-fed and grass-finished, freeze-dried (not heat-processed), non-defatted, and packaged in amber glass with a metal lid — no plastic, no fillers, no flow agents. Five capsules per day is roughly equivalent to a one-ounce serving of fresh liver. If you can stomach actual liver, eat that. If you can’t, the capsules are the next best thing.

Tier 3: When you genuinely want a shake

If after all this you’re still set on a meal-replacement-shape product, the closest thing I’ll recommend is HLTH Code Complete Meal. It uses grass-fed whey, casein, and collagen instead of soy isolate, MCT and cocoa butter instead of canola, and monk fruit instead of sucralose.

It’s still a processed product. I won’t pretend otherwise. But on the ingredient profile that matters — protein source, fat source, sweetener, vitamin form — it’s built on animal-based inputs rather than industrial plant inputs.

If “a shake at my desk” is the actual need, this is the version of the product that doesn’t fight against your physiology.

Frequently Asked Questions

Soylent Review Final Verdict: It’s Trash

Soylent is the product version of an idea that sounded good in 2013 and looks worse every year. The premise — that food is an inefficient delivery mechanism for nutrients and that we can engineer something better — runs against everything we know about how human bodies actually work. 

We didn’t evolve to absorb nutrients from a synthetic premix dissolved in canola oil and soy. We evolved to eat real food.

The science has only gotten more damning since the original version of this article was written. Sucralose looks worse. Maltodextrin looks worse. Industrial seed oils look worse. The category as a whole — ultra-processed food — is now linked to dramatically increased risk of cardiovascular death and dozens of other adverse outcomes in the strongest umbrella review ever published on the subject.

You don’t need a meal replacement. You need real food, a plan for the times you can’t cook it, and a willingness to ignore the well-marketed shortcuts that promise to take a few things off your plate but actually end up taking your health off it instead.

Now I’d like to hear from you. Have you tried Soylent or one of its competitors? What did it do to how you felt? Leave a comment below.