This seems neither new nor groundbreaking, however.
http://dst.sagepub.com/content/8/1/54.short
ETA: a 2011 review of the state of the art: http://knowledgetranslation.ca/sysrev/articles/project21/Ref...
http://dst.sagepub.com/content/8/1/54.short
ETA: a 2011 review of the state of the art: http://knowledgetranslation.ca/sysrev/articles/project21/Ref...
Trying to guess how many calories are in your food and adding them up each day isn't accurate, so a device that tries to measure it automatically based on your physiology only has to be that accurate. Maybe within 30% would still be useful to people tracking their fitness.
Obviously someone who is tracking their glucose or caloric intake for medical reasons should use FDA-approved medical devices and techniques for that, but those people aren't the target audience for this device.
I have no idea if this thing is legit or not, but calling it a scam because accurate non-invasive glucose measurement is a holy grail is completely missing the point of what the device is and what it's for.