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A single serving of pretzels is 10 pieces, however many people will eat twice as many without realizing they're eating a double portion. Many brand name cereals list a portion as ¾ or 1 cup.

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Portion distortion reinforces external food cues to dictate when you eat or stop eating. That means you become more reactive to eating food you see and less reactive to signals from your body indicating that you are hungry or full.

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Other researchers say food portions have been gradually getting larger because that's what many consumers want. It's called "value sizing" getting more food for the dollar.

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Hamburgers have expanded by 23 percent; A plate of Mexican food is 27 percent bigger; Soft drinks have increased in size by 52 percent; Snacks, whether they be potato chips, pretzels or crackers, are 60 percent larger.

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Farmers were able to grow food more cheaply by using fertilizer, pesticides and herbicides. In the 1970s, the government began subsidizing farmers to grow more food. Over time, companies have increased their serving sizes to increase their profits, and we all caught on.

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Portion Distortion is an effect most commonly in America where you eat more if you are served more.