Visitors to all courts around the country are searched by security staff for knives and weapons as they enter.
But staff at the court in High Wycombe have also been told to seize packed lunches.
Grieving families attending inquests into the deaths of loved ones were even told they could not bring in bottled water.
An official at the court said: "The concern is that people are going to use their food as a missile and fling it down the stairs at people.
"Apparently there have been incidents of lunches being thrown around in the past - so we have had to introduce these rules for everyone regardless of who they are or why they are here."