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 masteringdiabetes.org for more info about this).