Hi Joe and welcome to the forum,
It's always a great time to get your health in order. Don't be afraid to have an extra shake if you have an extra long day. Are you on the men's program? (Medifast 70?)
You've probably read that the first couple days can be a little tough until you get into the fat burning stage. Stick with it and you'll be into the MediZone before you know it.
Try to get at least 64ozs of water or 1/2 your body weight in ounces if you can.
Check in and let us know how you're doing.
All the best,