If something is forced down a fasting person’s throat, his fast does not become invalid. However, if he is forced to break his fast by eating, drinking, or having sexual intercourse – for example he is told, ‘If you do not eat food, we will inflict some financial or physical harm on you’ – and he eats something to prevent the harm from being inflicted, his fast becomes invalid.
Furthermore, based on obligatory precaution, his fast also becomes invalid if he is forced to do any of the other things that invalidate a fast.