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"Anything above 10 grams or more of sorbitol at a time has been shown to cause gastrointestinal upset -- and some of these low-carb diet foods have as much as 30 grams a serving," says Heller.

A low-carb diet is one that restricts the consumption of carb-heavy food and drinks (such as juices, beer and sugary sodas), on the basis you replace them with other nutrient-dense ingredients.

"Anything above 10 grams or more of sorbitol at a time has been shown to cause gastrointestinal upset -- and some of these low-carb diet foods have as much as 30 grams a serving," says Heller.