This doesn't make any sense

On weekends, I wake up like 2 hours later than weekdays and I can easily skip breakfast without even realizing it.

On weekdays, if I eat something piddling like a banana as soon as I wake up, I can last until a late lunch (past 1 PM). However, if I eat a nice breakfast (like a bowl of oatmeal and granola), when I arrive at work (about 1 1/2 hours after I wake up), by 11 AM my stomach is growling and I feel so dizzy for food. Why do I starve for food and much sooner the more and later I eat on weekdays?!!! You would think a big bowl of oatmeal can last me to a late lunch but as soon as I eat it, I'm ready for a steak.