You would set the names of the radio fields to be all the same. Then you would set their values to be all different like:
value="pizza"
value="roast"
value="bbq"
value="none"
Then in the insert record server behavior for the Pizza_field you would use the value:
<?php echo(($_POST['RadioGroup1'] == "pizza")?0:1); ?>
and similarly for the other fields.
On the update page you would have to hand code selecting the radio button when applicable with code like:
<input type="radio" name="RadioGroup1" value="pizza" <?php echo(($row_RecordsetName['Pizza_field'] == 1)?'checked="checked"':""); ?> >