They must give you a diet sheet surely ... The usual routine is: For the first two weeks after sugery it is 120ml simple fluid such as water and NAS squash sipped over an hour for 16 hours a day. Then two weeks of more complex fluids like Heinz Cream of Tomato soup (absolutely no lumps or bits whatsoever), tea and coffee, milk. Weeks five and six will see you thickening up through the puree stage. After week six you will transit back to solids with three meals a day of portions that will fit inside an egg - this is portion size for life. I found this transit very challenging and distressing but pushed through the constant regurgitation and am fine now. Fats and sugars for the rest of your life will need to be kept as low as poss - sugar ideally under 7% (ie 7g per 100g shown on the nutrition info on the product), an Activia 0% yog is aporox 14% sugar so way too high, so be aware that most diet low fat foods will be very high in sugar. Fats and sugars will make you very ill indeed if you have them.
You really do need to check with your provider for a post bypass diet, as they are all different very slightly but the example I have given was mine. Just remember with a bypass you are essentially waving goodbye to food, which has been our best friend and worst enemy. The challenge is enormous but so are the results, and certainly for me it was the best thing I ever did. I have a thread in RNY Gastric Bypass:inspirational photos before and after, it's title starts Be a warrior not a worrier ... Take a look if you are interested. And always ask the forum if you have a question as someone will always come on with an answer and/or advice. Xxxxx