How did you decide on the gastric bypass? Have you researched all your options? Take this time to RESEARCH like crazy - the different surgical options (VSG, DS, RNY, and band), the post-op dietary and supplement requirements, the potential side effects and complications (and means of mitigating certain potential side effects), etc.
In the meantime, when was the last time you had labs drawn? I wouldn't supplement anything more than a good multivitamin and maybe some vitamin D pre-op unless you have a known deficiency (most Americans are low in vit D anyway, so chances are you're not going to OD on it anytime soon!).
You ask about a special diet, but if you're seeing your PCP for 6 months, I assume that's for the 6-month medically supervised diet requirement, so you should already be following some sort of physician-recommended plan. Beyond that, each surgeon has their own requirements for pre-op diets, so you'll have to wait until you've spoken to your chosen surgeon ad have a surgery date set.
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