It sounds like your diet may be out of balance.  Make sure to include 3-5 food groups with main meals and 2-3 with snacks (lean protein, whole grains, fruit, vegetables, dairy, healthy fats).  For example, a salad with veggies and dressing includes vegetables and healthy fats but that alone is usually not enough to keep you full.  So add a protein source to it (beans/chicken) and round it a piece of whole grain bread and a side of yogurt.

The goal is to include foods with a high satiety value, meaning they take longer to digest and keep you fuller longer.  Here are some ways to increase the satiety power of your meals:

• Make sure most of your meals have a source of protein.  Protein is the most filling of the macronutrients (carbohydrates, protein and fat).  So include nuts on your cereal, a boiled egg or chicken on salads and build your dinner meals around a lean protein source.
• Include healthy fats with your meals.  Fat also helps to slow digestion and is satisfying.  Try chopped avocado on salads, nuts topped on yogurt and veggies sauteed in olive oil.  A healthy fat source at every meal will increase satisfaction.
• Fiber-rich foods are also filling.  Include fruits and veggies with meals (as you have), whole grains, beans/legumes and nuts and seeds.
• While it's great to eat healthy, make sure you eat meals you enjoy that also taste good.  That include sweets in moderation.  A small piece of dark chocolate or cookie after a meal can increase satisfaction and help keep cravings at bay.

Keep trying different things until you find meals that are not only healthy but satisfying.

 

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I am not an expert and am only answering from my own experience.  Even back to when I was younger, I can remember always being hungry and always eating.  People used to comment on how much I ate and that I didn't gain an ounce.  I also try to eat healthy and love vegetables.  Two years ago I was diagnosed with hypoglycemia- low blood sugar- not due to diabetes.  Especially around the time of my period my blood sugar is hard to control.  I feel like I'm starving and of course crave chocolate!  I usually give in and then that starts a viscious cycle with my blood sugars.  I try to have a variety of vegetables, fruits, cheeses, peanut butter and whole grain snacks (wheat thins, triscuits, etc) on hand.  So if you are feeling the signs- shaky, dizzy, weak, grouchy, feel like you could eat a freakin' cow LOL!.... you may want to have your blood sugars tested.

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You say that you sleep all night and are still tired the next day.  I had this problem for years and it turned out that I have sleep apnea.  Sleep apnea interferes with REM sleep and though it seems that you sleep all night you are waking up a lot. 
Sleep deprivation due to sleep apnea  or for any other reason can cause an imbalance in leptin and grehlin.  These hormones affect appetite.  I would eat a big supper and in an hour I was physically hungry again and wanting to eat another full meal.  I gained 15 pounds in about 3 months before I got treatment for the apnea. You might ask your doctor to assess you for sleep apnea or other sleep problems.  

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How are you doing with your issue?

 

I feel like this is really rare and you probably would know by now if you have this. Prader-Willi Syndrome will give you an unsatisfiable craving for food (if you are born with this you will have had this eating problem your whole life).

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User-generated content areas are not reviewed by a WebMD physician. WebMD understands that reading individual, real-life experiences can be a helpful resource, but it is never a substitute for professional medical advice. Please see the bottom of the page for more information or visit our Terms and Conditions.