It is a package kit we got from our doc. If I remember correctly first day @800 calories...goes down to @4-500 calories. Minimal brothy soup, cracker, drink mix, & some kind of small sweet .
I’m low carb-most days not more than 30 grams and many days under 10 and don’t count calories but guessing my daily consumption is probably 3500-4000 calories, mostly fat with some protein and cans from veggies/nuts