There's an interesting story at ladaat.info about a yeshiva bochur who went to get a brocha from Rabbi Karelitz before he underwent gastric surgery as a means to lose weight. According to the article, Rabbi Karelitz said that it wasn't sure that the operation was permissible, according to halacha. The rabbi suggested that the bochur should find another way to deal with his problem and said he would have to hear medical opinions before issuing a pesak. Rabbi Karelitz added that a ben yeshiva should work on the midah of Taavah - desire.
Another article is about a father who stopped a Hatzalah volunteer in Bnei Brak when his daughter lost consciousness after a piece of a jelly donut got stuck in her throat. The volunteer called other members of the organization to help him and they were successfully able to dislodge the donut. The girl was taken to hospital in stable condition.