considering I only left school last year I should most definitely know if the answer I'm going to give is right...but I'm not sure!
Most certainly it depends on what you drink. If you drink alcohol it raises the ammonia levels in your body which can cause the pH in cells to rise to toxic levels. Urea is used to almost neutralize the ammonia in our urine making it a yellow color, therefore the more alcohol or acidic things you drink the more Urea is used and the darker your Urine will be
I failed science so theres a chance absolutely none of that is accurate...but it sounds right in my head