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I would have gone on eating steel cut oats forever, thinking I was being ‘healthy’, despite feeling terrible each morning: shaky hands, fatigue, lack of mental clarity. Thankfully, I was able to tap into the truth about what this was doing to me, and make the simple dietary change my body needed.

Sam, 36, is an entrepreneur. Each morning he ate a bowl of steel cut oats, widely considered a healthy breakfast. This would cause his insulin levels to spike, resulting in shaky hands and a feeling of tiredness and hunger.

By continually monitoring his glucose levels, Sam was able to quickly discover this food didn’t react well with his individual metabolism. Switching to lower insulin breakfast foods, like eggs, helped him feel clearer, more alert and more satiated.

Before a run, I’d scarf down a protein bar or whatever was quick and easy. Some runs were great but on others I felt totally depleted. By learning what my diet was doing to my body, I’ve now optimized what I eat before and after runs, so I’m always getting the most out of my workout and at peak performance. I’ve even cut 20 seconds off my mile times.

Susan, 45, is a law firm partner, mother of 3, and 8-time marathon finisher. By continually monitoring her glucose levels with her pre-run and post-run meals, she was able to see how specific foods were affecting her body on a physiological level.

This helped her dial in her diet around workouts and avoid the energy depletion she was occasionally feeling. Susan recently hit a new personal best marathon time in Boston last year.

I always knew I needed to be healthier, to exercise and to eat better. But I never had the drive. Now I have hard numbers and real-time feedback to confirm whether what I’m eating is right or not. It’s incredibly helpful, and it’s even more motivating.

Dan, 62, is a business executive, slightly overweight and with high blood pressure that runs in his family. For years, he had been told by his doctors to eat better and exercise more. But diet always felt like an abstract concept detached from any of his health conditions.

Levels allowed him to immediately see the results of what his diet was doing to his body in real-time, empowering him to take control of his health and create a metabolic eating plan personalized to his body and life.