FitFoodie wrote:I've googled this and seen three months, but I'm curious to hear your experiences about how long you have to eat differently for it to possibly show up in your bloodwork, particular lipid profile.
Marc talks about Dave Feldman's work and, as I recall, Dave saw things in 3-5 days - he had a specific number of days that I don't recall without going back to his site. Personally, I know I can make things happen quickly, perhaps even over night and certainly in a few days.
My highest LDL reading (~159 mg/dL) was on the 7th day of a 7 day water fast. My Tg's were 126 mg/dL, which is very high for me. Why? Because fasting I was using fat for fuel and it needs to be transported. Gundry and I chatted about this on a consult. More typical values for me would be LCL-c of 107 mg/dL and Tg's in the 60 mg/dL range. I can change things overnight. Gundry wants us to have Tg's <50 and I told him the only way for me to get there would be to carb up the night before the blood draw - keeping my fat in my fat stores because of the higher carbs. I'm always in mild ketosis. Now, for most folks on a high carb diet, reducing carbs will typically reduce Tg's.
Insulin is very pulsitile, can can change in minutes. Hence fasting insulin values can move around quite a bit. Catherine Crofts' research with Joseph Kraft's data suggest that insulin is best "stress tested." Either on a 5 hour Kraft glucose/insulin challenge test or at exactly two hours after glucose bolus or carby meal. You can search our site for both Kraft and Crofts' work.