Can anybody throw out ideas on what it could be? I thought about the possibilities:

- I take 500mg magnesium 2x/week, on top of tons of chocolate and 1 bottle of sparkling water/day, and liberally salt my foods with pink Himilayan salt, so I don't think it's a mineral problem
- I drink about 1.5-2L of liquids/day, so it's not dehydration? Although lately my pee has been yellower/smellier lately...
- I easily eat over 5 lbs of red meat/week, 1-2 lbs fish/week, and 1/2-1lb liver/week, so it's not B-vitamins?
- I eat at least 10 servings of dried seaweed/week, so it's not iodine.