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Do any of these reveal the diet basics? I wonder if a Soylent-like product could deliver?

The Soylent Clone "Jake" https://jakeshake.eu/ has a "Jake Light" version that is just 1500 kcal per day:

There are a few ketogenic soylents -- check out the sidebar at http://www.reddit.com/r/soylent/

I go for Ambronite - it's real food and 500 kcal makes is perfect for fasting days. Ordered here http://ambronite.com/