O.M.G. day 2 of my 7 day protein Pre Op then 3 day clear. I have MAJOR headaches due to this drastic change in diet! I'm SOOOO tired even after my Adderall meds. The diet I don't mind so much (yet) as I'm vegetarian & love salads. I went to Aldi & they're version of Crystal Light is Fit & Active brand, to be diluted in 2qt of water. Super cheap ... great value! Make a pitcher & your ready to go. Also their Fit & Active dressings are low fat, carbs, cals & so good! I rotate dressings for variety! It's super affordable & I am happy I saved a bunch of $$ going there.