YES! I posted about this yesterday, actually...I get so grumpy it's miserable for me and everyone else.
I have one memory in particular that, looking back on it now, I think is hilarious although at the time it was not in any way humorous. A couple of years ago my mom and I began SB for the first time, and were faithfully on it for several days, and decided to go to the store one afternoon to buy some more food for the plan. It turned into an entire hour of snapping at each other, leaning on the cart because we were too tired to stand up, and at one point I even sat down on the ground and refused to go anywhere else unless I could buy a bagel or some ice cream or SOMETHING...haha.
As hard as it is, I know from experience that when you stick to it, it's worth it.