you basically need to eat foods that take longer for your system to consume. Fats like omega 3 and 6 are needed in your diet. The human brain lives on glucose and sugar in general, so you need to cut down your low string carbs, like sugar, white bread, pasta, potatoes and so on and bring in more long string carbs, like full grained bread, sourdough bread, beans etc. Long string carbs, natural fats and protein takes longer for you to digest which means you need less to eat to feel full because the chemical reactions in your brain will be different, you'll gain a more steady flow of glucose to your brain and to your cells on that kind of diet.
Im trying to lose weight aswell and Im reading a book on how the brain works and all the scientific results which suggests the best diet for your brain. You need to look at how your brain reacts to your intake of food and how it regulates your body rather than go on a low calorie diet that you and your brain will eventually start hating because its too one dimensional. I didnt understand how when I was eating pasta on its own I could eat and eat and eat it. But now I know why, its the reward system in my brain that plays me a trick, once my tongue reacts to the pasta and the saliva's meeting with eachother (there is an enzyme in humans saliva called amylase that makes starch to sugar) it tells my brain theres sugar on the way and my brain reacts like an addict "more, more, more!!!!". You have to control the reward system and balance your bodys intake of energy. There is more ofcourse. I cant help you with the book unless you can read danish or swedish since its two swedish doctors that made the book concentrating on the scientific research done on this subject. The authors names are Martin Ingvar and Gunilla Eldh. Im pretty sure theres an english book out there based on the same principles.