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Two devices that badyze people's respiratory gases promise to show how they can improve their diet.
Lumen and FoodMarble, which function as "breathalyzers," are handheld devices presented at the CES Technology Show in Las Vegas, USA.
They pair with smartphone apps that tell their users how they digest food or burn calories.
The app gives advice on what the user should eat that day
But according to experts, this technology has not yet been duly validated by scientists.
Lumen has raised nearly $ 2 million from the Indiegogo crowdfunding site. The company has designed a product in the form of an inhaler that measures the levels of carbon dioxide in the breath.
According to the company, this provides a way to monitor a person's metabolism – the set of chemical processes that convert, among other things, food into energy.
"You do not need to guess the amount of sugar contained in this Kung Pao chicken nor the number of calories you have burned during this period," explained Dror Cedar founder.
Instead, he explains to the BBC, the application simply states whether the user is burning carbohydrates or fat. He then suggests recipes that help burn fat and, over time, Lumen learns which diet is best for each individual.
Used lumen product
Photo: BBC News Brazil
Scientific Validation
According to Cedar, the device has been tested by hundreds of users in the United States.
However, studies on the efficacy of the product have not yet been reviewed by field researchers.
The lumens will go on sale for 299 USD (R $ 1,104) in the coming months. The application may charge a subscription fee in the future, but will be free for the first year.
FoodMarble measures the levels of hydrogen to try to infer the digestive health of those who use it. The device was launched in December and the company has collected $ 1 million with pre-orders, which have already been shipped.
Founder Lisa Ruttledge told the BBC that breathing hydrogen levels could be a sign that someone was having trouble digesting a recent meal.
"It's because there is a fermentation in your gut and that part of the hydrogen created in this process is exhaled," he said.
The idea is to help people with swelling, abdominal pain and other gastrointestinal symptoms to improve their nutrition. By displaying foods that lead to hydrogen production, FoodMarble could help its users adopt a healthier diet.
However, although these tests are sometimes used by doctors and nutritionists, some people doubt their accuracy.
"There is little scientific research showing that these tests, done in a hospital setting, help determine which foods you are sensitive to," said Kevin Whelan, professor of dietetics at King's College of Medicine. London.
Indeed, several factors can affect breathing – especially the time needed to digest a meal, which is not always the same.
Lisa Ruttledge said that one of her company's goals was to make FoodMarble the first device of its kind to be evaluated as part of a scientific study.
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