Fruits
Grapefruit: Want to ingest fewer calories during meal time?  Eating half a grapefruit prior to gathering around the dinner table can  help fill you up enough to where you are able to resist that second  helping of tortellini. The plentiful amounts of soluble fiber in  grapefruit slow down the digestion process.
Watermelon: Everyone has experienced the stuffed feeling that  comes from this colorful fruit. The water invades the space that your  stomach leaves open for food, thus making you less likely to pig out.  Apples and pears produce a similar result, too.
Berries: If Hollywood still made horror films based around foods, The Attack of the Killer Sweet Tooth  could easily be the name of a new thriller. Instead of allowing  yourself to succumb to the temptation of a cookie, pop some blackberries  or strawberries into your mouth. Frozen blueberries also provide the  illusion of enjoying a cold, high-calorie treat (step away from the  Häagen-Dazs!).
Veggies
Cucumber: Refreshing and crunchy, is there anything  better? Cucumber has very few calories and helps to stave off liver  disease and pancreatic cancer, and even keeps your nails looking amazing  due to the high mineral content. Keep a few slices in the fridge for a  nourishing bite!
Hot peppers: Although they haven’t been directly linked to  weight loss, spicy habaneros or jalapeños aid in curbing the desire to  gorge since we typically eat less when our food has a fiery flavor. Hot  peppers also comprise the compound capsaicin, which speeds up the  metabolism.
Celery: If you’re a self-proclaimed snacker, celery will be  your best friend. Not only does it satisfy the need to eat something,  but it has virtually no calories (one cup of celery equals a measly nineteen calories).  Tip: instead of adding cream cheese or peanut butter to the stalk, give  fat-free cottage cheese or fat-free black bean dip a go!
Protein
Greek yogurt: Some of us can’t stand traditional yogurt, but when  it’s this thick and creamy we will race down to our favorite market  just to stock up on it. Besides its wonderful texture, Greek yogurt  “keeps you satisfied longer,” according to sports nutritionist Leslie Bonci, MPH, RD, because all proteins take their sweet time leaving your stomach.
Eggs: Start the day off right with seven grams of  protein! Having an egg in the morning will keep your body busy because  digesting eggs burns more calories than a carb-infested breakfast.
Fish: It has been engrained in our brains that fish is full of  omega-3 fatty acids, vitamins, and minerals. But did you know that wild  salmon, tuna, and sardines all make your body more responsive to the  fat-burning hormone leptin, which is responsible for suppressing your  appetite? If you won’t eat fish, turkey can also help you ditch the  extra pounds, as it encourages the release of tryptophan, which helps  you sleep. Remember: lack of sleep wreaks havoc on your waistline!