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Lumen
Handheld breath-based metabolism tracker
Nutrition & metabolic healthWearables & consumer diagnostics
Lumen is an Israeli health-tech company whose handheld breath-analysis device measures whether the body is burning fat or carbohydrates, paired with an app that gives personalised nutrition guidance.
The read
Lumen makes a small handheld device that analyses a single breath to determine whether the body is metabolising fat or carbohydrates, feeding the result into an app that gives real-time nutrition and exercise guidance. A 2025 study benchmarked Lumen's breath-based measurements against standard indirect calorimetry equipment, lending independent scientific validation to its core measurement claim.
The product is currently sold through a distribution partnership with GiddyUp rather than direct-only e-commerce.
The Bridgehead view
Lumen is betting that validated proprietary hardware is a durable moat as GLP-1 drugs commoditise the generic "what to eat" advice layer that software-only rivals like Noom rely on, but hardware also means slower iteration cycles and higher unit costs than an app-only competitor.
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Personalised nutrition & gut-health science app
ZOE
ZOE is a UK-founded health-tech company that combines at-home biological testing of the gut microbiome, blood sugar and blood fat responses with an app that gives members personalised food guidance.
ReadBehaviour-change weight-loss & GLP-1 companion app
Noom
Noom is a US-based mobile app that combines cognitive-behavioural coaching and food logging with, since 2023, prescription GLP-1 weight-loss medication support.
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