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One of the papers mentions using an existing commercial TDR (total dietary replacement) product:

https://www.one2onediet.com/

And a calorie limit of 8-900 per day (and some support from a weight loss consultant, which I guess I spires the name, the 1:1 diet)

I've been drinking ~1600 calories of Huel Monday-Friday for a little over a year, maybe you could try this.

Or even one of the many other food replacement drinks.

I personally enjoyed Huel back in version 1, or it may have been 1.1, but then it quickly swung into containing high levels of sweetener. More popular than other options, but if anyone else found it had moved into drinking cake then try some of the others rather than giving up.

I found the same. I would find my thing with Huel then they’d be out of stock or change it up.

Also despise their website and shopping setup. Everything is pushing you towards expensive, repetitive subscriptions.

12 weeks with a total daily calorie intake of around 800–900 kcal