I am not talking about allergies, but about milder food intolerance. How do people approach this to quantify and measure it? I have read that most serum lab blood tests are useless. Prick tests? Elimination and reintroduction seems to be the consensus, but still there is nothing quantifiable. Do people use blood glucose measurements to determine their food intolerance? Some people use heart rate or heart rate variability(HRV) changes while eating particular foods. Please share your strategies!