I read about a study at Google showing that office snacks in a shared work area saw a 40% decrease in the amount taken when jars had lids on them. That means that the extra “work” of taking the lid off a jar made those M&Ms 40% less desirable.
We can laugh at the ridiculousness of these psychological and cognitive tendencies, and we can put that knowledge to good use. When I learned this, I immediately made the rule that no junk food is allowed in my house. That doesn’t mean I never eat it, it just means I have to want it that much more because the “lid on the jar” involves the hassle of going somewhere to get my fix. This happens far less.
Interesting facts like this might make you a hit playing Trivial Pursuit. But I prefer to make them actionable by asking: how can I use this?