caffeine

I am 2 years out now from my RNY, but started weight gain about 8 months ago. I cant' understand why everytime I step on the scales I went up a pound! The dietician in St. Louis said that anyone who starts to gain weight after surgery should cut out all caffeine. I started to gain the weight when I went to nights at my job, and I downed the coffee,and still do! Does anyone know about this issue? I have gained 20 pounds back now! Help.

I already cut out all milk dud, but had no withdrawls since I replaced them with your no bake cookies. But I will try the no coffee if that is one of other problems I have! I heard someone speaking about caffeine makes your pancrease put out extra insulin, and I am hypoglycemic now anyways.