i tried one optifast shake (still deciding on surgery but getting closer) and got a monster headache and brain fog for a few hours following looking on their site this is normal for after a few days on the optifast program after your body goes into keto, not as a reaction right after drinking one shake! now i’m worried about two weeks of drinking them pre-surgery if i’m reacting to something in them like this. i’ll ask the dietician about it before surgery but wondered if anyone else had a reaction like this?

Nope - one ‘reaction’ could be badly timed coincidence though?

I never took much to the optifast shakes but loved the solid bars. Maybe try one of those and see how you go...

I was on optifast for one month preop. I used all strawberry shakes (premixed). My husband and I both loved them and never had an issue.

I agree with the poster above. Maybe the headache was caused by something else and was just coincidental.

Always best to check with your dr though.

thanks, i'm going to try again and see what happens as a start and hopefully it was just coincidence

i'm glad you both didn't have issues with it