I am four years and 8 months post bypass and taking your vitamins is always going to be important. The reason you may wish to continue the chewables is that they are more readily absorbed by your shorter digestive tract. My surgeon tracked by levels carefully for two years every three months and now I make sure they are checked yearly.
You can never obtain enough vitamins from food and don't make a mistake and forget that. I still take protein though not as often, usually in the morning. When I skip my calcium, I have gas and diarrhea. I used to order a vitamin I like called vita-for life that was developed for gbp patients. Now I take two centrum, and 3 calcium and I am on hrt to make sure I absorb enough.
I actually lost more weight than I thought I would and had to work hard to gain weight back. I did not like that gaunt look many of us get after the first weight loss, but your body levels out and you start to absorb a few more nutrients and if you take your protein, your energy and skin tone looks and feels healthy. Good luck, I hope this helps you.