Group Union

I have the following query that always give me two rows. I want to group them to one row using tbluser.userid, is it possible to group a union?

SELECT
SUM(tblfooditem.calories)
FROM tblfooditem
INNER JOIN tbluser ON tblfooditem.userid = tbluser.userid
WHERE tblfooditem.userid=?userid AND tblfooditem.date=?date
GROUP BY tbluser.userid
UNION
SELECT
SUM(tbladdedmealitem.calories)
FROM tbladdedmeal
INNER JOIN tbluser ON tbladdedmeal.userid = tbluser.userid
WHERE tbladdedmeal.userid=?userid AND tbladdedmeal.date=?date
GROUP BY tbluser.userid;

From stackoverflow

• It's possible.

  select sum(s) from (
  SELECT
      SUM(tblfooditem.calories) S,tbl.userid
      FROM tblfooditem
      INNER JOIN tbluser ON tblfooditem.userid = tbluser.userid
      WHERE tblfooditem.userid=?userid AND tblfooditem.date=?date
      GROUP BY tbluser.userid
      UNION
      SELECT
      SUM(tbladdedmealitem.calories) S,tbl.userid
      FROM tbladdedmeal
      INNER JOIN tbluser ON tbladdedmeal.userid = tbluser.userid
      WHERE tbladdedmeal.userid=?userid AND tbladdedmeal.date=?date
      GROUP BY tbluser.userid
  ) Q
  group by Q.userid