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The phenomenon, called Delboeuf's illusion, is "a fascinating optical illusion of the perception of relative size". It is said that our brain can become confused by seeing the size of objects, depending on its context.
The basic idea behind this phenomenon, when it comes to diets, is that by opting for a smaller plate, we finish the contents that can fit in that plate. And once we finish the portion, a message is sent to the brain that we have eaten a large amount. That, experts say, makes you feel full of less food. However, if we choose a large plate and pile it up with food, we end up eating too much.
A 2014 study found that "due to the illusion, research participants overestimated food on plates with large edges as those with thinner edges. The study was published in the International Journal of Obesity.
Another study found that people with large soup bowls poured more food than those with smaller bowls.
But a recent study has questioned the relationship between this illusion and food. They experimented on two samples of people – those who had eaten an hour before the experience and those who had not eaten for nearly 3 hours before the experiment.
They were then shown pizzas served on trays as well as pictures of inedible things such as black circles in circles and tire hubcaps. They were then asked to compare their sizes. People who had not eaten for a long time guessed the sizes more accurately than those who had just eaten. This clearly shows that our brain can not be deceived when it comes to food.
On the results of the study, some nutritionists say that weight loss is much more complex than sleight of hand. Our perception of food is really important and that is perhaps why people who diet end up eating more than they want – because they feel restricted.
According to a nutritionist, positive reinforcements still help to lose weight. For example, instead of saying "reduce" "restrict your diet", you have to say "enjoy this portion" "enjoy this". When it comes to feeling full, a good balance of nutrients is of utmost importance.
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