Are you sure you were at a deficit of 700 cals? Were you actually tracking your calories? How much lifting were you doing? Was it an increase over your current routine?
I am not entirely sure it was a 700 cal deficit but am positive it could not have been less than a 400 cal deficit and thats a stretch. The last two weeks I had been increasing my reps and sets while working my biceps, triceps, shoulders, back, chest and abs.
Is it possible to gain weight while eating at a deficit of almost 700 calories? Last week I gained 1.75 pounds while maintaining the deficit I mentioned and I was just wondering if it's because I've been hitting the weights.