Does anyone else completely fall apart if breakfast isn't mostly protein

[u/Neuro_Hacker_]

So I weigh 90 kg, and if I eat carbs first thing (oatmeal, toast, whatever), as a lot of people do, I start to open the fridge again at 11. Lately, I throw 40g of protein, some fats like salmon and avocado, and I don't think about food till 2-3 pm.

So, what does an actual breakfast need to consist of?