Pretty widely known effect of sugars on the body. The more simple, processed carbs you eat, the more hunger you feel. Easy enough to test out: stop all simple carbs for 2-4 weeks, observe the results. If you're deep into carbs or junk food, there will be withdrawal symptoms from the sugar addiction. After a month, you'll notice you don't crave any sugars, and you'll feel significantly less hungry on a regular basis.