I would like to see some over the counter take home device that lets you figure out what spikes your blood sugar, and then creates a diet tailored to. I'd be ok

I would like to see some over the counter take home device that lets you figure out what spikes your blood sugar, and then creates a diet tailored to. I'd be okay with some finger pricking device. Yes, decreasing caloric intake can cause weight gain - I want to know what the most effective ones to cut are, and replace them with less potently delivered ones.