Soylent too high in fat


Fruit juice?!? You might as well just drink soda. It’s the same stuff.

Yes, carbs turn to glycogen (sugar). Then the blood sugar is regulated by insulin to turn excess sugar into fat.

FWIW I’m not a nutritionist either… I’m an engineer. Have you scanned this forum for the many fat vs carb discussions?


I have scanned the forums. I mostly see people advocating keto because they are interested in the short-term weight loss, or high protein because they think it helps with bodybuilding. I don’t see a lot of info here talking about what is the diet that is going to contribute to the longest life and greatest health, which is why I posted this topic, because it seems to me that the community of physicians looking at nutrition from that perspective have a very strong consensus towards low-fat high-carb.


Very strong consensus? This is the amazing thing about the internet… if you go down the right rabbit hole you might conclude climate change is a hoax or vaccines cause autism.

Start here:


This movie review does a nice job of breaking down what they all missed (or ignored?)

There’s also the problem that with such low fat and protein, most people won’t be able to follow the diet – or will be eating endlessly while following it.


I’m not an expert and this discussion is getting pretty technical. But I did have a conversation with a doctor not long ago about such matters, and he believes that people are all unique and do not react in the same way to various diets. So 37% fat might be just what you need, but not the right thing for me.

Personally I think that the fat content in Soylent is higher than it should be. Both the World Health Organization and the US government advocate for a lower percentage. But they are not evaluating Soylent; they are looking at average folks’ fats. However I also believe that a person with a healthy system should be able to adjust to Soylent’s formulation. I have been able to without any difficulties arising. My intake is in the 25-30% range. I am a satisfied customer but eating only Soylent strikes me as unwise.


OK, I read the movie review you linked to, although some of the finer points are hard to have an opinion on since I’ve never seen the movie Forks Over Knives.

The position of the movie reviewer seems to be, “I believe that this diet makes people healthier, but not necessarily for the reasons given in the film. Possibly these doctors just stumbled on to an effective diet by accident that happens to work, but for other reasons, like ditching processed foods and cutting back on omega 6. I’m not convinced you can’t get the same benefits while eating some meat, dairy and fish.”

The doctors in the film apparently all recommend the same basic diet for maximum health: whole-food, plant-based diet. If you’re eating a whole-food plant-based diet, the macronutrient ratio that naturally occurs in such a diet would be about 80% carbs, 10% fat, 10% protein. So indirectly, they are endorsing such a macronutrient profile.

Let’s think about this in the context of Soylent.

These doctors advocate vegan. Soylent is already vegan. No need to argue about that point, and whether it is necessary for great health.

These doctors advocate whole foods. Soylent is not whole food, it is highly processed. But there is no way it could ever not be highly processed, so again, no need to argue about this point. If you believe processed foods are inherently harmful, you shouldn’t be drinking Soylent.

So the remaining issue is macronutrients. Soylent is plant-based, but it isn’t a whole food. Nevertheless, it is certainly possibly for Soylent to do better at mimicking the macronutrient profile of a whole-food plant-based diet that is known to have such positive outcomes. Even if you think the 10% fat level recommendation by these doctors is too extreme, Soylent’s fat level is too high for all current mainstream recommendations as well (isn’t that why they got into trouble in Canada, because the Canadian govt felt the fat was too dangerously high to be called a meal replacement?), and it’s too low to satisfy the keto people. So who is Rosa Labs making happy? What science backs up this particular formulation?

To reiterate, I went down the path of researching this because I wanted to answer the question of why my own health markers were trending worse since I started drinking Soylent for the majority of my caloric intake. The nutrition science that correctly predicts the outcome I’ve personally seen says that excessive fat intake increases insulin resistance and raises cholesterol (see for more info about this).


My impression is that you’ve rediscovered the anti-fat perspective that was so popular for so long and let food makers get rich for so long with labels such as “low in fat!!” that did nothing to help health and in fact presided over a massive increase in obesity.

Now, the perspective is changing, as reflected in the “Big Fat Lie” NY Times article that Greg linked, but still, if you incorporate the old perspective that fat is evil, you will naturally get the impression that fat is evil.

There was also a video posted several times in which a doctor expressed the newer, more pro-fat perspective. I wonder if you watched that video as you carefully scanned the fat discussions?


I’ve long been interested in nutrition, so I read the Taubes article when it came out in 2002, and read the many articles debunking it in the 16+ years since, and watched with great interest as it came out that prior to his death, Atkins suffered from a heart attack, congestive heart failure, and hypertension (

Nevertheless, I have an open mind, and I personally tried “Soylent plus only no-carb foods” diet for a year. My A1C and cholesterol skyrocketed, unfortunately, just as mainstream nutrition science predicts.

I don’t think it’s accurate to say that the “old perspective” is low-fat, and “new perspective” is low-carb. The most accurate summary would probably be that the core nutritional recommendations have remained unchanged for many many decades: as Michael Pollan summarized “Eat food. Not too much. Mostly plants.” Most doctors I’ve spoken with seem to think of the Atkins/paleo/keto diet as a fad from the early 2000’s that demonstrated some interesting short-term weight-loss effects, but is unlikely to be safe in the long-term.

I remember running across the Sarah Hallberg TED talk a few years ago. I was watching it on YouTube and the next video that autoplayed was another TED talk by Neal Barnard about reversing type 2 diabetes through a whole food plant-based diet. Check it out:

What was going on? I wondered. How is it possible that two doctors in a row on TED talks could argue directly opposing points about what reverses type 2 diabetes? Is the correct diet low-carb or low-fat?

This launched my investigation into the question of diet and type 2 diabetes, and it turned out that in a sense, both were correct. The underlying science is that fat causes insulin resistance. So you have two choices:
Choice 1: You can eat all fat and virtually no carbs. You’ll become insulin resistant, but it won’t matter, because you won’t be eating carbs, so no need for insulin. Once you go down this road, you have to be really careful to avoid carbs because your natural insulin won’t work properly and your blood sugar will spike extremely high in the presence of carbs.
Choice 2: You can eat all carbs and virtually no fat. Your cells will regain their insulin sensitivity, your type 2 diabetes disappears, and your body can handle the carbs with aplomb provided you stay away from fat.

It would appear that the solution to diabetes lies in the extremes, either extreme. Fats plus carbs is the problem.

Either seems to work in the short-term, but epidemiology tells us that eating high fat and virtually no carbs is likely to harm us in the long run, with a higher risk of heart disease and cancer. Simply put, there aren’t any societies / cultures we can point to that live a long time on such a high fat diet, whereas all the “blue zone” cultures where people live the longest eat copious amounts of whole plant foods with low caloric density. If you’re going to bet on one of the two extremes, it seems pretty clear to me which way I want to bet.

Let’s bring this discussion back to Soylent. The problem with Soylent in its current formulation is that its macronutrient profile seems to be one of the worst possible combinations. The fat is so high as to trigger insulin resistance in vulnerable individuals, but then the carbs are also high enough to cause blood sugar spikes in those who are insulin resistant as a consequence of the high fat. My “soylent+high fat foods” diet failed because when I was eating so much fat, the carbs in Soylent were enough to send my blood sugar sky high. Soylent was insufficiently keto for that approach to work.

Soylent also makes it difficult to pull off the other extreme of eating low-fat. Pursuing that approach to reversing diabetes, the level of fat in a single Soylent is about the max you’d want to get in a day.

But lets say you don’t want Soylent to be an “extreme diet” macro profile, i.e., neither aggressively low-carb nor aggressively low-fat. I think that’s reasonable, as Soylent is primarily catering to healthy individuals. Well, then you’d want to look at current mainstream recommendations. Recommendations from the Institute of Medicine and the Academy of Nutrition and Dietetics for healthy individuals are that 20% to 35% of total calories should come from fat. I think the evidence favors going closer to 20%, but anything in that range would be an improvement. There’s no mainstream organization out there that I’m aware of suggesting that for long-term health, the percentage of calories from fat should be as high as Soylent’s (47%). That’s crazy high, unless you’re going to go to full extreme of eliminating carbs altogether.



Another source you might enjoy talking about fat as probable cause for extra calories and obesity in America.


Ah yes… Some guy on the internet named Kevin disputes the science… In related news more people now believe the earth is flat because they saw a video on YouTube…


There are other studies that show less of a difference between low carb and low fat diets…

I would like to try Keto at some point but it sounds like a hassle.

I found the following account interesting even though I’m not diabetic. Namely how trying to stay in an ultra low carb or ultra low fat diet is fairly difficult… interesting how her blood sugar shot up with a bit of saturated fat while on the low fat diet as compared to her normal moderately low carb diet. Similarly I’ve heard a bit too much carbs can throw you out of ketosis for a few days(?) then you have to claw your way back in (Keto fog?)

Seems to me it’s the blood sugar spikes that cause the insulin response which creates the body fat (and insulin insensitivity in extreme cases).

The enemy would seem to be some combination of simple carbs and saturated fats… (as well as calorie imbalance… obviously) which seems to typify the modern American diet.

Soylent being fairly high in unsaturated fat and moderately complex carbs seems about right. Maybe more fiber would be good?

Not sure what the optimal level of carbs is… aside from high heart rate activities (like running a 5k) it seems to me the fewer the better.


He tends to back his data with scientific studies. That doesn’t make it true, since the data needs to be analysed accordingly and there is a lot of discussion as seen in t his thread in both end. Just put it there for people who might be interested.

i did not take any stands in either side.


More fiber would definitely be good.
As for soylent being moderately complex carbs… You have maltodextrin, complex carb which behaves like sugar; and you have isomaltulose a sugar that behaves like complex carb in term of absorption. Not sure if I would define it like that.


This medium post is in agreement with everything I have seen from experts who have reviewed Taubes’ claim. It makes no sense to say that low-fat dietary guidelines caused obesity, because the data is clear that people did not in fact lower their fat intake as a consequence of those guidelines.


Thanks for posting the link to the 23 studies.

These do not actually compare low carb to low fat, despite the headlines. If you drill into the studies, you’ll see that the “low fat” diets in these studies are 30% calories from fat. No one would really consider that low fat – it’s “moderate fat” at best. The studies that actually look at people with “whole food, plant-based, no added oil” diets, which average 10% calories from fat, show unequivocal benefits.

That said, even the results of these studies you linked to, which compare high-fat-very-low-carb to a moderate diet demonstrate results that you should find alarming. The studies you linked to with a longer timeframe showed no statistical difference in weight loss between the two groups, but the high-fat-very-low-carb groups had higher total cholesterol and higher LDL cholesterol, which is perhaps the biggest risk factor in heart disease. This is precisely why doctors advise against high-fat diet in the long-term.

Bringing this back to Soylent, if you are a believer in the benefits of the high-fat-very-low-carb approach and the rise in LDL cholesterol and total cholesterol doesn’t concern you, these studies looked at 60% fat along with less than 4% calories from carbs. Can you find a single study advocating 47% calories from fat and 33% calories from carbs? I can’t: those who advocate for high fat believe it is only safe if you heavily restrict carbs. High fat plus moderate carbs seems to be right in the sweet spot of awfulness that no dietician would recommend.


I’ve lost 15 pounds and 20pts of LDL in the last few years since I’ve been on mostly Soylent… I used to add extra oil to Soylent (and Schmoylent) to up the fat. I didn’t quit the practice for health reasons but rather just because it was a hassle. Like I said before, I would like to try Keto at some point just to experience it. Likely from a soylent type powder/oil combo.

On the most part though, I’d think a <10% carbs or <10% fat diet would be just too much of a pain in the ass.

Better just to minimize the simple carbs/sugars and saturated fats…

If you believe a <10% fat diet is right for you, Go for it! But please leave my Soylent alone. It’s working great for me as is.


As I said, I’m not really expecting Soylent to suddenly cater to the extremes and go either <10% carbs or <10% fat. But its current ratio doesn’t make any sense, and fat level is far above all recommendations (except for those who advocate extreme carb restriction, and Soylent shouldn’t be catering to those sorts of extremes).


At least we now have a lot of new posts on this old subject!


Lol. I guess you can find anything on the internet. Carbs are bad! Fat is bad! The earth is round!

This is kinda like religion here (or politics)… not changing any minds, just making lots of noise. Sigh.