I've lost some weight recently by cutting my intake. My inspiration was my sister who used to be 5'2" and 260lbs but is now ~130lbs. She got her stomach stapled and for some number of months was on a 500 calorie a day diet. (I don't recommend that)
Anyway, seeing that and reading things here on HN about how calorie restriction has an order of magnitude more effect than exercise (which I do) I decided to try to eat ~1500 calories a day for a while.
It's surprisingly HARD because of how little food that is.
They way people eat in the USA, it's crazy how large the portions are. I'm in Japan where the portions are smaller but, calories are labeled on most things and even with small portions it's amazing to me just how little I can eat and stay under 2000 a day let alone 1500 a day.
A "small" Japanese convenience store style sandwich is 300 calories. Those are probably only 60% the size of the smallest sandwich I'd see in the USA. Pretty much any small Japanese pastry, donut, thing made with bread is 300-500 calories. Again those are at least 30% smaller than their USA counterparts.
Soda, Fruit juice, coffee with sugar, etc, all around 140 calories for 12oz.
Potato-chips or fries or a sugary snack? Forget about it!
The point is, it wasn't until I actually tried seriously looking at my calorie intake that I realized how many calories I was consuming. A small lunch, a medium dinner and a snack and I'm over 2000 calories easily. There's no way I could fit any kind of "normal" breakfast in that routine and still fit in 1500-2000 calories.
Anyway, I guess like I said that's kind of obvious but for whatever reason it wasn't to me until I actually started paying attention. As for being hungry all the time, yea, because of 48+ years of eating way too much my idea of what a meal should be or how much I should eat to feel like I've done more than just had a snack is seriously out of whack.