If it happens every time you eat Vietnamese then places that serve it aren't to blame. I recommend looking into your diet prior to your ventures toward Vietnamese restaurants.
Fatty pork can also cause these symptoms as well as items that contain lots of sugar.
Food Safety Report: TT Pho, Riley Fuzzel Road, Spring, TX, USA
If it happens every time you eat Vietnamese then places that serve it aren't to blame. I recommend looking into your diet prior to your ventures toward Vietnamese restaurants.
Fatty pork can also cause these symptoms as well as items that contain lots of sugar.