WEll for CKD type diets the purpose is this.
Day1: Low carb Low insulin, high gh high test
Day2: Low carb Low insulin, high gh high test
Day3: Low carb Low insulin, high gh high test
Day4: Low carb Low insulin, high gh high test
Day5: Low carb Low insulin, high gh high test
Day6: Carb load High insulin, high gh high test
Day7: Carb load High insulin, high gh high test
From what i've read GH is suppressed by the release of insulin, however on a carb load it's suggested that because of the low amount of carbs during the week then the spikes through the day of insulin the body sees it as a stress or and releases high levels of gh.