I just started the shakes diet on Tuesday. I've been having these terrible headaches and I feel really weak. Is this normal?

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Sounds normal to me...it could be that you're going through withdrawals from certain foods, sugar, etc. Make sure you stay hydrated.

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Withdrawals and dehydration... up your water intake and see if that helps. It takes water to flush out your system, so drink up!

Withdrawals and dehydration... up your Water intake and see if that helps. It takes water to flush out your system, so drink up!

Thanks a lot, I'll do that.

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Yes! I did the Optifast as well. It sucks for the first 3-5 days. Don’t cheat or it’ll be worse. If you’re on any meds for high blood sugar, check your bg levels all the time. I ended up stopping mine after 4 days cause I was bottoming out. Once I started drinking about 96oz of water a day, I felt better as well.