Earlier quoted context omitted.
Where can I buy a tube feed exactly? Do you have any examples of Trinknahrung?
Pharmacies, Amazon, even eBay. Afaik Fresubin 2Kcal DRINK is the highest calorie Trinknahrung from Fresenius. Amazon.com doesn't offer that many, what's there is quite expensive [0]. Never realized this stuff is so rare outside Germany, until now. In contrast, Amazon.de has a wide selection of different high caloric Trinknahrung, the Fresenius stuff even has Prime delivery [1]. [0] https://www.amazon.com/s/ref=nb_sb_…
> 2 x 200ml bottles per day will provide 40g protein, 800kcal and meets the average adult recommended daily requirements for vitamins and trace-elements# (DOH 1991).
You would need to drink 5 bottles to meet average calorie requirements. I don't know if there are health risks to consuming 2.5x above the daily requirements, but it was clearly not designed to be a total meal replacement.