In the NY Times last week, professor Brian Wansink talked about some of his research on how people have relatively little concept of what they're eating and usually take visual cues from outside sources, rather than from their own bodies about fullness. He mentioned a test that involved giving participants stale and fresh popcorn in different-sized containers that showed people would eat more from the larger container - even if that was the stale popcorn. That is not the only experiment that he and his colleagues did to support their position, however. They have a whole repertoire of experiments that demonstrate the same results. The tests answered these questions:

• Do even educated eaters fall prey to mindless eating based on container size?
• Does a food or a wine label affect how people feel about their meal and how much they eat?
• How hard is it to correctly estimate portion size based on container size, and how can the shape of a container make you consume more?
• Does how food is described change consumption rates?
• Do visual clues help slow down mindless snacking?

The answer is "yes" to each of these questions and they way they got to that answer in each case was interesting. Re-naming peas as "power peas" got kids to eat more. Educated eaters still binged when given oversized bowls and color-coding chips so people could see exactly how much they were eating helped them to eat less. The tests don't necessarily tell us anything new, but it's always interesting to see how people react in these different situations anyway. In fact, it's sort of tempting to try them out on coworkers in the break room or, if you have a child that needs to do a science project, questions like these could be a good starting point.

The more food that is put in front of you, the better the odds are that you will overeat or, at least, eat more than you might otherwise. Generally, this is common knowledge, but some researchers put it to the test by giving people both good and bad tasting foods. Specifically, while one group of participants got varying sizes of freshly popped popcorn, another group was given 2-week old stale popcorn (described as "perfectly safe, just a bit funky"). The results proved the theory, when fresh popcorn eaters ate 43% more popcorn when it was served in a large container and stale popcorn eaters ate 34% more.

If the taste of a food isn't enough to stop people from eating it, it's best to control the size of the container that it's in. So do yourself a favor and use smaller plates and bowls, especially for snacking. Or fill up a bowl with healthy fruits and veggies for munching.

Exact portion size can be difficult to determine without measuring (which is an option), but there's too much variation in all those guidelines that compare portion sizes to, for example, the size of a fist. When in doubt, just take a little less that you think you should. At the very least, you'll be eating one less bite at a time - and over time, even a small change like will add up.