Fasting in Ramadan, a person did not wake up one day to eat the meal taken before the dawn.

Fast Invalidators
Eating and Drinking
To Break Fast due to Hunger/Thirst
Fasting in Ramadan, a person did not wake up one day to eat the meal taken before the dawn. Therefore, he could not continue fasting until sunset. During the day, something happened which forced him to break his fast. Is he required to observe kaffārah?
A: If he keeps the fast and breaks it only when it becomes — due to hunger and thirst — unbearably hard for him to continue, he has to perform only qaḍā’ of the fast and no kaffārah is required.
Source: Hadana adopted from the Istiftaat of the Grand Ayatollah Khamenei