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Help Your Kids Lose Weight by Losing Weight Yourself (page 2)

By Susan B. Roberts, Ph.D.
Obesity Prevention Special Edition Contributor

Our Availability Instinct

Bad Popcorn in Large Buckets

In a study at Cornell University, 158 moviegoers were offered free popcorn in return for answering some questions about the theater after the movie. Half got fresh popcorn in 120-gram (4-ounce) or 240-gram (8-ounce) buckets. The other half got stale popcorn in the same-size buckets. After the movie, the containers were weighed to see how much everybody ate. The moviegoers who were given a large bucket of stale popcorn ate almost as much as those who were given a smaller bucket of fresh popcorn. This doesn’t mean they liked it. They just ate it because it was there.

Average amount eaten (in grams) Small Size Large Size
Fresh popcorn 59 86
Stale popcorn 38 51

When you open a bag of potato chips, do you eat more than you intended? Or if you stick your hand in the cookie jar, do you find you have had several, not just one, before you can stop? If so, it’s because your availability instinct has taken charge and you just can’t help yourself. It’s a little recognized fact that having food readily available can trigger hormonal and nervous system activity that makes us hungry—even if we’ve just finished a fancy five-course dinner. Still more surprising is the recent finding that the available food doesn’t even have to taste good! We’ll wolf it down as if we haven’t eaten for days. It turns out that we’ll even overeat stale peanuts if there’s a big enough bowlful within easy reach.

Our instinct to eat just because it’s there developed thousands of years ago and is a major cause of weight gain today in both adults and children. As members of the species now called Homo sapiens, we had to cope with the changing circumstances in the world around us. This was essential for survival, and the most successful survivors were those who ate whenever food was available. The problem for us today is the abundance of available food, especially if it’s food that we know and like.

Bigger portions are a further problem because even more food is in front of you when you sit down to eat, so your availability instinct keeps you from putting your fork down when you should feel full. After summarizing all the research studies on portion size and food consumption, my lab calculated that for every 1,000 calories added to your plate on top of what you need, you’ll most likely end up eating about 190 of them. That doesn’t sound like a lot, but continuing to do this just once a day for a year can cause a weight gain of many pounds (at 190 calories per day, you would gain almost 20 pounds in a year!). It’s easy to blame it on mothers for telling us to clean our plates, but most of us do this pretty instinctively with no encouragement at all. And when portion sizes are routinely several times what we actually need, the internal signals that we rely on to tell us when to stop eating become confused. In a study conducted by Brian Wansink at Cornell, soup bowls were refilled surreptitiously so that none of the participants knew how much they were consuming (because the levels in the bowls never went down). The surprising result was that, on average, the participants ate 76% more soup but estimated that they had eaten only 5% more!

Gulp, Gulp, Gulp. Large portions also encourage what I call the Gulping Syndrome. Faced with a large plate of a favorite food, we tend to take bigger bites than we normally would and swallow them quickly without realizing what we’re doing. Often we prepare the next mouthful on our fork while we’re still swallowing the previous one. Studies show that even preschoolers will take larger bites if they’re presented with large portions of food.  Instinctively adapting to their environment, they open their mouths wider and swallow faster.  Preschoolers!!

Here’s why the Gulping Syndrome is such a problem. When we take big bites of food, we don’t give ourselves time to realize that we’re getting full. This means we end up eating more simply because it takes longer for us to feel satisfied.

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