Deliberately inducing oneself to vomit will break the fast if the vomit is a mouthful. If the emergence of the vomit cannot be restrained, the vomit will be said to be a mouthful. Vomiting less than a mouthful will not break the fast even if deliberately induced.1 Furthermore, if a small amount of vomit came out but it returned down the throat on its own, the fast will not break. However, if the person swallows it intentionally, his fast will break.2