After 30, one should seriously evaluate breakfast. Three meals per day becomes just too many calories to burn. Two meals for an adult is plenty. Coffee in the morning suppresses hunger, so one can go until 12-12:30 before getting woozy. At some point I noticed that I was force-feeding myself lunch if I ate breakfast. Hunger is a normal feeling - embrace it.
Of course we evolved with hunger being a regular part of our experience and only in modern times can the gnawing feeling of hunger be avoided almost entirely by many people, or addressed immediately with a convenient food.
I am no biologist but my own experience and some reasonable assumptions would point to the idea that there are biological processes taking place during hunger pangs which are part of our overall energy systems.