MY_MODULE.module

<?php

/**
 * Implements hook_menu_alter().
 */
function MY_MODULE_menu_alter(&$items) {
  $items['user/%user_category/edit/profile']['access callback'] = FALSE;
}

/**
 * Implements hook_form_FORM_ID_alter() for the user edit form.
 * Merge the profile2 form with the user account form itself :
 */
function MY_MODULE_form_user_profile_form_alter(&$form, &$form_state) {
  if (($type = profile2_get_types('profile')) && $type->userCategory) {
    if (empty($form_state['profiles'])) {
      $profile = profile2_load_by_user($form['#user'], 'profile');
      if (empty($profile)) {
        $profile = profile_create(array('type' => 'profile', 'uid' => $form['#user']->uid));
      }
      $form_state['profiles'][$profile->type] = $profile;
    }
    profile2_attach_form($form, $form_state);
  }
}