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.
The latest Dietary Guidelines for Americans recommends keeping saturated fat to less than 10 percent of calories a day. For a 2,000-calorie-a-day diet, that's 200 calories or about 22 grams of saturated fat. Use the Nutrition Facts label to find out how much fat is in the foods you eat. The Nutrition Facts label shows the amount of total fat, saturated fat and trans fat in one serving.