Compare the Ensure[0] nutrition facts with Soylent 2.0[1]. Note specifically that 1 Ensure is 220 calories vs Soylent's 400, so you'll need to basically double everything on the Ensure's nutrition facts page.

I don't take either Ensure or Soylent (and I'm not sure that USDA recommendations for a 2k calorie diet are that good). It appears that Ensure tries to match a 100% USDA recommendation for caloric profile (at 9 servings per day fat/carbohydrates almost add up to 100%), while providing way over the recommendations on vitamin/minerals (~225% for most, close to 500% for a couple). On the flip side, Soylent appears to try to hit the vitamins/minerals 100%, while having a high fat, low carbohydrate profile (175% fat, 60% carbohydrates).

On the whole, it looks like they are not really replacements for each other, other than in the broad category of "meal replacements" since the caloric profile, and serving sizes are so far away from each other.

Personally, I'd go with the high fat, low carbohydrate version since I've found that those types of meals (in general, not specifically for "meal replacements") tend to keep me more satiated for longer periods of time.

[0] - https://ensure.com/nutrition-products/ensure-original#vanill...

[1] - http://files.soylent.com/pdf/soylent-nutrition-facts-2-0-en....

I thought was an interesting question, so I Googled, and there are actually some pretty convincing replies on Soylent's forums - http://discourse.soylent.com/t/comparing-soylent-to-existing...

Soylent actually has all the nutrients required for an adult human, while Ensure does not. Ensure assumes you eat SOME other food to make up for nutritional deficiencies, while Soylent aims to provide a 100% replacement for all of your meals if you desire it.

I used to drink Ensure before I switched to soylent. I couldn't stand how sweet Ensure tasted, it's kind of disgusting.