Technologists in the US are showcasing two portable gadgets, Lumen and FoodMarble, that a**lyze the gases in users breath and displays how they should improve their d*etary.

A user b***s into the pocket-sized devices that pair up with a smartphone app that reveals how well s/he is digesting food or burning calories.

Lumen has been designed with an inhaler shap*d product that measures carbon dioxide levels in the user’s breath.

This provides a way of monitoring a person’s metabolism, a chemical process that converts food into energy.

Lumen’s app displays whether the user is b*********rbohydrates or fat, with frequent use, the device learns what d*et is most suitable for the user.

Stud**s that wi*l account for the effectiveness of the device have not yet been p*er-viewed, although hundreds of users are trying it.

READ: DETECTING C****R THROUGH BREATHE

Relatively, FoodMarble device released in December measures the hydrogen levels in a user’s breath in an attempt to make conclusions about one’s digestive health.

FoodMarble founder, Lisa Rutledge has said that the presence of hydrogen in one’s breath can be a sign of trouble digestion from a recent meal.

“It happens because there’s fermentation going on in the gut and some hydrogen created in the process is exhaled,” said Rutledge.

The device has been created to aid people who experience abdominal pain, bloating and gastrointestinal symptoms to reveal foods that produce hydrogen which should be avoided.

This latest technology is yet to be validated by scientists despite the fact that about one mi*lion pre-ordered FoodMarble devices have been shipp*d.