"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.

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“Many healthy options had different focuses, like low carb, high protein ... BistroMD offers three meals and two snacks per day, or two meals per day, with different plans for males and females.

"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.