If you want to be serious about eating to feel full, do some research. And then do some more. Because diet is a highly personalized thing. What works for some will not work for others. But as Blackjack200 has already stated, the key to losing weight is calories in < calories out. And that is it.
I have lost 50 pounds by counting calories. I have a lot more to go and have started adding some cardio in for heart health. But it is still only calories.
The things I have learned for myself:
i track my calories. i have an app for my phone and i log everything. try it and you might be amazed at how much you are actually eating. once you really start keeping track of what you eat, you can see what choices you make that are calorie wasters.
drinking anything other than water is a complete waste of calories. no soda. no juice. calorie free drinks like tea and coffee are okay if you like them without sugar or creamer. ( i don't, so it's just water for me)
I need fat in my diet. it helps me to feel fuller longer. and if you are eating a moderate amount of the right kind, they are not 'evil'. i eat cheese. and butter. and other foods with fat. and i love them.
i eat more greens and veggies. veggies and salads are great ways to eat a lot and not get a lot of calories. i dont like a lot of veggies. but i like a few, and so those few i eat by the crapload. they are a great source of fiber, which also makes you feel full.
i eat more FRESH fruit. i love fruit. i think fruit gets a bad rep when people talk about diets, but as in everything, moderation. fresh fruit is about a bajillion times better than canned fruit or fruit sauces though so i stay away from that.
i eat more lean proteins. i love red meat and would eat it every day, but i personally feel chicken, turkey and fish are better choices, so i eat those more now. proteins are great for making me feel full without a huge calorie impact. i also eat more eggs. which i love.
i find that now that i am really choosing foods that i not only like, but are calorie smarter, i eat a LOT and still don't have a lot of calories. leaving me with room for treats even!
for example, the other day i ate only 1300 calories. im not trying to eat that little. but i had a cup of yogurt for breakfast with some blueberries and honey wheat germ mixed in. a chicken caesar salad for lunch. for dinner i had half a bag of steamed broccoli, pasta with alfredo sauce and TWO rolls. and then two freeze pops later that night. 1300 calories. and if i ate anymore, i would have felt stuffed. now granted, it wasn't the best as far as eating enough protein for the day, but i was under my carb goal, under my fat goal. and i never felt hungry all day.
a few years ago i would have had fast food for 2 of those three meals, and a bunch of wasted calories in soda and juice that totaled about 3000 calories and probably still felt hungry.
you need to really understand that it is a change of mind. it has to be, or it won't work. and that it takes time and effort. or it wont work. i didnt get to this point overnight, or even after a few months. some people like to eat early. some people like to eat late. some people just dont like fruit. whatever works for you personally, as long as you try to be smart about where you get your calories.
weight loss = calories in < calories out.
sorry for the ridiculously long post and good luck!