breakfast (a smoothie),
mid-morning snack (an apple and a cup of tea), and
lunch (grilled chicken and a spinach salad with balsamic dressing).
My last meal was around noon, and it is now 2:17 and I'm STARVING.
I wasn't planning my next meal until like 7:00 (a protein shake)
Ok I shall put two posts up here one pointing out the obvious mistakes you are making here and the second pointing out why this obsession with protein makes people go astray
First thing and most startling, but could be depending on what you are putting in your smoothie. You are runing the tank on empty your first portion of starchy carbohydrates is when? Your last evening meal?????????? If your main source of carbs is fruit based its a short lived energy source. Quite simply you have no immediate fuel source to run off, its then switching to your protein and breaking that down as quick as it can, oh and depending if you dont have the consumption level right it will be eating into the glycogen in your muscles too whilst it bridges the gap of energy conversion and release so not good.
Secondly you say you are hungry yet the only true solid you are having untilmidday is an apple, not even a glas sof milk as well you would expect if you were taking in regular small meals as 70 calories alone wouldnt really cut the mustard as an in between meals.
Then again you are stretching out the duration to 5 hours before your next feed and thats just a liquid fom and protein.
So basicaly you need to address your carb defficieny and cut back on the liquids if you dont need the calories.
You also need to plan your meals better getting a good macro split. If you want to eat 6 meals a day the look at it like this: say you are on 3000 calories a day
That will allow you:
3 main meals: Breakfast 500
Total = 1800
This leaves a total calorie allowance of 1200
You now want 3 other snacks/meals so that allows you 400 calories per snack