It works best if you use it in the morning. I think that the acitogenic dieter will probably find utilityi in seeing whether he burning fat or carbs mostly. You can, you can use this to track every morning to see, ya, that's what you can iterate with your diet, and then see, and then you can get like a plot graf. Does it tell levels are just, it doesn't giveyou. It has a proprietary algorithm. But they did publish,. this is actually on of the reasons why i decided, i agreed to test it out. They did publish a pureview paper. Then i found that it was correlated with a the metabolic cart