I ate 1000 calories by noon.....

I definitely sympathize with you! For me, it helps to plan out my meals everyday in a food journal and then log them on My Fitness Pal after I eat them. By doing this, it shows me how many calories I am eating, and it helps me to stay on track. I pack my food in a lunch bag for work. I have had the problem of feeling hungry a lot, so I have to be very conscious of when and what I'm eating. Maybe you could have a set place where you keep your food for the day and just be sure to log it all as you eat it.

For starters, you can accept that you'll probably be over today. You can get active so you have a few hundred more to use today. But reflect WHY are you grazing and eating more than you usually do; are you hungry, emotional, tired, bored? Or are you really more hungry? If you're truly hungry, maybe you should increase your calories for a few days, or look at exactly what you have been eating. Are you missing something? Need more protein? More fiber? A bit of fat?

You'll figure out what is going on and adjust. Keep coming back here, look at other people's food diaries to see what their days look like.

Are you doing any exercise? Those calories will be burnt in no time.

How long have you been restricting your calories to 1200? Part of it may be that you are just trying to drop too many calories a day too fast. Perhaps trying for a goal of 1600 a day would allow you to loose weight, while not feeling like you have to eat all the time.

Water is also a good suggestion, you won't feel as hungry when you are drinking water.
There are a few 'no calorie' snacks, you can use if you just need to munch. I use to eat pickles, they are high in salt, but if you don't care about that just plain pickles the serving says they have 0 calories each. You can eat a dozen of them for 0-5 calories depending on how you want to list them. I never bothered putting them down. Also, Celery.

If you are sure 1200 is the right calorie limit for you, and want to keep that. Than go for a walk, and eat back all the calories you spent walking. Your goal should be a NET of 1200 calories not 1200 calories total. Meaning 1200 + Exercise calories = Total calories you can eat. When I first started dieting, I put down every bit of exercise, even just going up and down the stairs in my house to get to the restroom. And then I would eat those calories back... After a while, I didn't feel so hungry, so I cut the 'extra' exercise I was adding on.

This morning, breakfast was 559 calories. Lunch was 479. My afternoon snacks came to 276 calories.

And, this is just a start.

Why are you eating only 1,200 calories, especially since you are so young? It sounds like you need to eat more.

Are you active? Do you exercise? If so, you need to log those calories in and eat most of them back.

I would suggest planning your meals, logging them in early in the day, and sticking to your plan.

On the weekdays, I plan all my meals out, take my own food to work, and make sure I don't graze on all the goodies in the office. If I do, the consequences are that I have a hard time stopping and I will gain weight. The weekends are a bit different since I'm not in a situation where there are opportunities to stress eat.

Finally, make sure your goals to lose weight are reasonable. If you have loads to lose (30-40 or more perhaps) then your goal can be to lose 2 pounds a week. However, if you have less fifteen, ten, or less pounds to lose, you might want to set your goals to lose at 1 pounds per week. For example, I have only 9.5 pounds left to lose and I have my goals set to lose .5 pounds per week The reason I'm doing this is so it comes off slowly and moving into maintenance will be easier once I've lost all my weight.

I suggest you reassess your goals and start eating more.

1. stop feeling guilty
2. plan better
3. reassess your goals. At 18, 1200 calories a day is unlikely to be an appropriate goal for you. How much are you even trying to lose? Your ticker says 1kg. If you're a healthy weight, then it's even less likely that 1200 calories a day is enough.

Set your calories to maintain and just eat under that and you will still lose weight! You can always plan on hitting 1200 but if you do go over you can at least see that you have quite a bit of wiggle room