On Category page, How can I get the category ID?

This might be very basic question, but I can’t really get the category ID on category page (actually a category page of custom type post).

Filename is taxonomy-item-category.php & URL is http://www.abc.com/cat/food/

I have tried some of the following but not working…

$cur_cat_id = get_cat_id( single_cat_title( "food", false ) );
$cur_cat_id = get_cat_id( single_cat_title( "", false ) );

get_the_category( "food" );

How can I get the category ID on category page?

$cat_id = get_queried_object_id(); – it’s that simple!