mysql: FULLTEXT or FOREIGN KEY

DROP TABLE IF EXISTS `counters`;
DROP TABLE IF EXISTS `news`;

CREATE TABLE `news` (
  `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `header` VARCHAR(500),
  `subheader` VARCHAR(500),
  `leed` TINYTEXT,
  `text` TEXT NOT NULL,
  `src_name` VARCHAR(256),
  `src_url` VARCHAR(256),
  `ya_title` VARCHAR(500),
  `dt` TIMESTAMP,
  `ready` BOOL DEFAULT FALSE,
  `cat_id` INT UNSIGNED NOT NULL,
  `user_id` INT UNSIGNED NOT NULL,
  `city_id` INT UNSIGNED,
  `files_id` INT UNSIGNED,
  /*FULLTEXT (header,subheader,leed,text),*/
  PRIMARY KEY (`id`)
) ENGINE=INNODB;

CREATE TABLE `counters` (
  `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `news_id` INT UNSIGNED NOT NULL,
  `cnt_day` INT UNSIGNED DEFAULT 0,
  `cnt_month` INT UNSIGNED DEFAULT 0,
  `cnt_all` INT UNSIGNED DEFAULT 0,
  PRIMARY KEY (`id`),
  CONSTRAINT `counter_fk` FOREIGN KEY (news_id) REFERENCES news(id) ON DELETE CASCADE
) ENGINE=INNODB;