function fasting_and_fitness( $user_id, $user_tags ) {

    $fasting_and_fitness_tag = wp_fusion()->user->get_tag_id( 'fasting system And fitness program' );

    if ( wpf_has_tag( 'fasting system', $user_id ) && wpf_has_tag( 'fitness program', $user_id ) && ! wpf_has_tag( $fasting_and_fitness_tag, $user_id ) ) {

        // Add the "fasting system And fitness program" tag if they have "fasting system" and "fitness program"

        wp_fusion()->user->apply_tags( array( $fasting_and_fitness_tag ), $user_id );

    } elseif ( wpf_has_tag( $fasting_and_fitness_tag, $user_id ) && ! wpf_has_tag( 'fasting system', $user_id ) && ! wpf_has_tag( 'fitness program', $user_id ) ) {

        // Remove the "fasting system And fitness program" tag if they don't have "fasting system" and "fitness program"

        wp_fusion()->user->remove_tags( array( $fasting_and_fitness_tag ), $user_id );

    }

}

add_action( 'wpf_tags_modified', 'fasting_and_fitness', 20, 2 );