I've got a problem to solve. I've wordpress site with 2 pages : Food and Cooking.

I've groups : food_groups (1) and cooking_groups (2).

I wish to show only (1) on Food page and just (2) on Cooking page.

Help me to solve it . Thanks all.

Use this code, here you need to alter the category id of yours.you could have more sample at http://codex.wordpress.org/Function_Reference/query_posts

   query_posts('cat=3');
   // set $more to 0 in order to only get the first part of the post
   global $more;
   $more = 0;

   // the Loop
   while (have_posts()) : the_post();
   the_content( 'Read the full post ยป' );
   endwhile;