Im seeing bubbles (foamy) in my urine concentration (in toilet bowl) for the past week and having  yellowish urine (slightly more yellow in morning). I often feel  low energy and slight temperature (feverish) during day time. Quick Google search says this a sign of kidney issue which can only be solved with dialysis or kidney transplant. Other search result says it could ve diabetes. But I even had a pre-surgery (pre-operative) checkup in December- urine and blood test  that showed everything is normal (for the record surgery wasn't related to any nephrotic issue or any disease)  How is this possible? Should I consult a nephrologist soon? Ps: I should mention that I've been practising one meal a day (OMAD diet) for the past ten days or so hence