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The pitch: Hack your metabolism

Method: Breath

Time for results: Four weeks of use

Key players: Trainer Don Saladino and Bulletproof Nutrition founder Dave Asprey

The Lumen metabolism tracker is a hand-held, portable device—like a vape—that uses a CO2 sensor to determine if you’re burning fat or carbs for fuel. (Burning fat is good because it promotes weight loss and keeps you energized when glycogen stores are low—whether in a midday slump or the middle of a marathon.) If I wake up and get a score of 4 or 5, it means my body is burning carbs, so my personal nutrition recommendation is to eat less of them and get enough healthy fats to satiate my appetite. Over time this will improve body composition and increase energy levels. $299, plus $19 per month for a membership

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