By eating foods that are low in calorie density (have fewer calories per pound), you can fill your plate up without measuring your food or counting calories. And you can eat until you're full, and lose weight without feeling hungry all the time.
The foods that are lowest in calorie density are veggies, fruits, starches like potatoes, corn, oatmeal, and other whole grains, and legumes. As you can see from this photo, 200 calories of grapes will fill up your stomach way more than 200 calories of almonds.