A former FDA commissioner went dumpster diving to find out why we overeat
washingtonpost.com
washingtonpost.com
Some foods spike your insulin levels and 3 to 4 hours later your body is so glucose deprived that you feel bad and depressed, but take one bite to eat and within 5 minutes you're chipper again.
Just because people are given the option for more food for another .30 more people go for it not realizing they may be getting another 500 calories they shouldn't be consuming.
I would say to friends, "Do you honestly need the extra food?" and I would get the "But it's a bargain!" response.
And "potato chips" isn't an ingredient.
This limits me to fruits, vegetables and meat (generally) and helps me stay away from processed food. It is really easy to remember too. I pick up an item at the store, ask myself it will rot, if it will, I buy it.
Also, I do tend to stay away from rice and grains as they usually have a high glycemic index and I have a history of Type II diabetes in my family.