After the flu shot
There’s really no restriction when it comes to what foods to eat after getting the flu shot. You have to listen to your body, feed it what it’s craving, and try to keep general good practices in mind.
Stay hydrated
Again, maintaining a good balance of fluids and nutrients will help your immune system process the flu shot and start building protection. Moreover, one of the best ripple effects of a flu shot is having a slight headache.
Being dehydrated could ultimately exacerbate the headache. But if you drink enough water the day before, the day of, and the day after your flu shot, you should be fine.