Are there foods that act as appetite suppressants?

Fiber, fiber, fiber. Eating a high fiber diet: more than 30 g per day will help suppress appetite.
Food for Appetites. Using food to suppress appetite is a great idea - here are some hints. Apples, green tea, fiber, red wine vinegar, pine nuts, and water can reduce appetite. Another effective method is to eat high nutrient dense foods, which reduces cravings. The best way is to avoid low nutrient carbs which lead to blood sugar swings and hunger. I drink tea and have a piece of fruit and some nuts if i'm hungry!
Yes. Water, organic vegetable broth, green leafy vegetables, natural pickles, apples are great to fill you up so you dont feel hungry and they are very low in calories.