Enjoyment and ease of preparation/consumption are also relevant.
Breakfast bars are convenient and are marketed as being nutritious, but they are also relatively expensive and most people enjoy them less than eggs and bacon. They are also arguably less healthful than, for example, fresh fruits and vegetables, but many people would not find fruits and vegetables filling enough to constitute an entire breakfast.
Enjoyment and ease of preparation/consumption are also relevant.
Breakfast bars are convenient and are marketed as being nutritious, but they are also relatively expensive and most people enjoy them less than eggs and bacon. They are also arguably less healthful than, for example, fresh fruits and vegetables, but many people would not find fruits and vegetables filling enough to constitute an entire breakfast.