Mac wrote: One Fung reference I wanted clarification: "However, fasting does not increase hunger. You’re less hungry".
I can tell you I've been at this for 4 months, and pretty much feel the same hunger at 18 hrs that I did 4 months ago.
I’m with you. I’ve been listening to my husband George talk about being ketogenic and not feeling hungry any more. JEALOUS!
I’m also ketogenic, fast approx. 16 hours a day, eat basically the same diet as he does, just twice a day vs his once a day and I still struggle with hunger issues. I will say my hunger is tamped down from before I started this lifestyle, but I still struggle. I will say during my 7 day fast, Dr Fung's quote was true, the hunger did not increase during the fast, in fact my hunger issues got better as the days passed.
On our lab results for Dr Gundry, my leptin (hunger hormone) has gone down from 18.4 (12/15) to 9.0 (6/16). According to the lab’s reference range, at risk is <2.3 or >64.2, so both measures are “good”, yet as I write this my stomach is gurgling with hunger (which in the Fung/Moore book they say sparkling water is good for that.)
George’s lab results for leptin started crazy low at <.8 (12/15) and has remained crazy low. As this is in the lab’s “at risk” range, this measurement was marked red, but in discussing our lab results with Dr. Gundry, he dismissed the red saying that’s what you want, you want it low. George, who used to deal with ravenous hunger cravings when he was a carb based vegetarian, now doesn’t deal with hunger issues, so maybe with time…?
Dr Ron Rosedale discusses leptin. I haven’t done a deep dive on the subject, but it seems to go hand in hand with insulin. You can develop leptin resistance much like you can develop insulin resistance. Leptin is produced by the fat cells in the body. Losing weight leads to reduction of leptin levels. George is very lean, I am considered “normal weight” but do carry fat I could lose, I would say our leptin measures reflect that.
But while losing weight reduces fat mass, which leads to a significant reduction in leptin levels, this doesn’t necessarily reverse leptin resistance. The reduced leptin makes the brain think it is starving, so it initiates all sorts of powerful mechanisms to regain that lost body fat, erroneously thinking that it is protecting us from starvation.
In the Fung/Moore book,
The Complete Guide to Fasting, they say “The body always wants to stay at a certain weight, and any deviation above or below that weight triggers adaptive mechanisms to get us to return to that weight.” i.e. feelings of hunger. This is how I explain my continued feelings of hunger as I have lost weight since by following Dr Gundry’s diet aided by finally having a surgery (it took 3 of them) that addressed the pain in my foot allowing me to walk comfortably again, return to an active lifestyle, and feel good about myself again. I just “power through” my continued feelings of hunger. Fasting does help me with the mental resolve that “this will pass” as feelings of hunger don’t grow, they do come and go in waves and since the hunger issues do seem to have gradually reduced, I am hopeful, they will only continue to reduce with time and continued fasting/weight loss and someday I can join my husband with his no hunger issues status.