Prova detta.
include('connect.inc');
if (( $rows['food'] == "yes" ) || ( $rows['food'] == "no" )) {
header('location: mypagelocation.html');
exit;
}
eller så kan du skriva det så här också.
include('connect.inc');
if (in_array($rows['food'], array("yes","no"))) {
header('location: mypagelocation.html');
exit;
}