A big Hi and Welcome to Bandboozled India
The pre op on the site is the most up to date, so I would always refer back to this one for values etc. Normal slim fast powder is totally fine to use 🙂
You would have to do a full day on the powder or a full day on the ready made shakes unfortunately, you cannot mix and match these. So probably best to see what works for you on that particular day really.
Exciting times hey, when is your surgery?? and don’t forget if you are on Facebook come and join us on ‘BandBoozled Bariatrics’ FB group for more chats and support from the other members
We look forward to supporting you on your weight loss journey xx