Not into exercising? Well then at least more slowly. If you give your brain a chance to catch up with your mouth, you won't need as much food to satisfy your hunger.
Eating slowly not your thing? Well then for a mere $1500-$3000, you can have a contraption installed in your mouth called the Charlie Bite. If you open your mouth too wide, a flange comes down and prevents you from chewing, therefore forcing you to take smaller bites and eat more slowly.
Not into having an expensive uncomfortable piece of metal fused to your teeth? Then get off your ass and exercise.