I'm on 3 shakes a day preop diet.

Today was day 2 and I had an Optifast Soup and half a shake. Yesterday I had the soup, half a shake and about half an optifast pudding.

I try to force myself to just keep drinking it but I can't do it. Will my body not go into ketosis because I'm not drinking enough?

From my experience carbs are what keep you out of ketosis. I had trouble with the shakes too. Call your surgeons office and ask what the alternative is, maybe another brand or whatever. Just stay on really low carbs.

If you feel the need you can buy little ketosis tabs/sticks to check for ketosis.

Good luck, this is tough going through the pre-op but you CAN do it.

Colleen

Honestly dont worry about it. Its short term. That pre op diet nearly kills everyone....I drank like maybe two shakes a day and that protein bar that came with optifast. I hated that soup and I hated the vanilla shakes and it turned out ok...I lost 16 lbs in 10 days. Consider it a boost in your weight loss success. Youll get through it. We all do! good luck on your upcoming surgery.