Portion size again

Estimating portion size is difficult for all of us, but developing rules of thumb will be handy. Because we have got used to larger portions in restaurants, our estimate of calorie content of a meal gets confused.

Research by Brian Wansink and colleagues has shown that everyone (normal weight, underweight and overweight, men and women) has difficulty in estimating the calorie content of a large plate of food, whereas they accurately assess the calories in a more normal portion.

If we are overweight, we tend to have larger portions. That means that those of us who are overweight are making these wrong estimates frequently. As a result, we are underestimating the calorie content of most of our meals and so we put on weight. What to do?

These researchers suggest that you should estimate the calories and then double them. A normal meal might be 500 calories. If you are overweight and you know that you are eating a large portion, then advise yourself that this meal probably contains 1,000 calories - half your day's allowance.

Counting calories is dull, but having a fair idea of the calorie content of your meals is handy. It allows you to develop useful rules of thumb when you are seriously trying to control your eating.

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