The pitch: Monitor your blood sugar without a finger prick
Time for results: two hours
Key players: David Sinclair, a Harvard Medical School professor, who’s an adviser.
Levels is a pretty simple glucose monitor that sticks to the back of the upper arm for two weeks at a time. The sensor measures glucose from the fluid between cells. Although not as accurate as a finger prick, it’s well suited for those seeking to lose weight or improve insulin resistance. Every five or so minutes, it reads fluctuations in blood sugar, then provides feedback: Swap your morning bagel for something higher in protein; add fat and fiber to your post-workout meal; or take a walk after dinner to diminish the blood sugar spike. $398 to start (includes $199 annual membership fee and first shipment of supplies)