Some people hungrier than others. Food is important to some people. When some people get hungry, their stomachs may rumble or make noise. Others don’t. You would never know they were hungry. Also, some people only seem to eat small amounts at meal times, whereas others devour large amounts of food and always seem hungry. If people didn’t eat after a day, they would certainly be aware of it.
They would be rather hungry. Also, exertion and exercising also play a factor in this. If you exert large amounts of energy by working out or running, then you would feel hungrier than someone who did not exert energy. People who survived on the ocean without food or water have been able to survive for many days with limited food.