Definition. The urine creatinine test measures the amount of creatinine in urine. Creatinine is a breakdown product of creatine, which is an important part of muscle. Creatinine is removed from the body entirely by the kidneys. Creatinine can also be measured by a blood test.
Ketones are the byproduct of breaking fatty acids down to be burned. Okay, it's a water fast, but we can assume that after 3 days, ketosis is acheived. About 250 grams of fat is about the maximum amount of fat that will be burned daily. I say around 250-300 grams per day.
In honor of National Nutrition Month, we're taking a look at the dietary guidelines for some of the sneakiest health spoilers. Fat: The American Heart Association suggests that people consume 500 to 700 calories from fat each day, somewhere between 56 to 78 grams (or 25 to 35 percent of your total daily calories).