If you spend less than 60 minutes a day eating – you are eating too fast. It takes at least 20 minutes for your gut to tell your brain that you’ve eaten. Paying attention to what you are eating, chewing and savouring each bite, eating without distractions, such as driving, phone calls or texting, goes a long way to reduce overeating. Vegetables, fruits and complex carbohydrates all take more time to eat than prefabricated processed foods.

From near the bottom of this linked page, http://www.theglobeandmail.com/life/...185295/?page=3

When I step back, I figured I'm eating too fast or just as bad, eating while doing something else. ie. reading online.