Your metabolism powers everything that happens in your body. By training it to be more flexible, and switch more easily between burning carbs and fat, you can improve many aspects of your well being. From work-outs and weight loss to sleep and longevity.

Lumen measures the CO2 concentration in a single breath. The CO2 you exhale is produced when your metabolism turns fuel into energy. Through a patented algorithm Lumen can use the measurement to accurately tell you, at a level comparable to that of gold standard RER measurement equipment, what fuel your body is currently using for energy - fats, carbs, or both.

A more flexible metabolism makes it easier to lose weight, with Lumen you'll train your body to switch more easily from burning carbs to fat. Many users find this helps them with weight loss. Additionally if you select a weight loss track in the Lumen app, Lumen designs your nutrition plan in a way that supports healthy and sustainable weight loss.

Reaching a state of ketosis usually requires extended deprivation from consuming carbohydrates. Lumens methodology isn't about cutting out carbs but rather incorporating healthy carb rich foods into your diet, while training your body to shift more efficiently between using carbs and fats as a fuel source and maintaining a healthy state of fat burn.

For more info read this article on the subject.

Yes. Lumen has been validated in multiple studies as well as peer-reviewed and scientifically proven to be as accurate as the gold standard for measuring Respiratory Exchange Rate (RER) . Read the peer-reviewed paper.

No. Lumen is a wellness product that helps you measure and track your metabolism.It does not diagnose, treat, cure or prevent disease, and its recommendations are not medical advice. Always speak to your doctor if you have any concerns about your health.

We want you to be completely satisfied with your Lumen. So please reach out to Customer Support if you're having problems. But if you decide Lumen is not for you, just return it within 30 days of receiving it for a full refund. Read our full refund policy.

Lumen is under warranty throughout your membership term . So if your device or charging dock develop a fault caused by manufacturing defects and you have an active membership, we'll fix or replace them free of charge. Accidental damage is not covered. Read our full warranty policy.

We created Lumen to help people above the age of 16, improve their metabolic flexibility so they can enjoy better work-outs, improved sleep, easier weight loss and happier, longer lives. However there are certain conditions and diseases which can impact the Lumen results and therefore we do not recommended Lumen for people with the following:

‍Who should not use Lumen? ‍Conditions affecting the measurements:

• Diabetes
• Severe asthma
• COPD
• Pregnancy

‍Additionally Lumens nutritional recommendations may not be suited for people with:

• Kidney disease
• Cancer
• Thyroid disorder

‍For other medical problems, please check with your doctor first.