All theory here... I think it has a lot to do with thermo effects on the body, this is all a guess and based on what I have read on Rays site, i recommend every one read his site, if only to get a better understanding of how the body converts food to fuel.
Anyway heres my guess.. and thats all it is
Either full starch (Potato) or full protein (meat) diet would work to drop weight, add in good fats to either and the weight lose slows or in some cases stalls. I think there is an increase in the bodies metabolic rate which in turn increases the thermo load (similar to Cold stress theroy, remember where this idea came from and the research Ray Cronise is doing, read his blog for some great insights, but no solid answers.....)
Say for me at 6'2" and 235lbs my BMR is ~ 2200 now with exercise and an increase due to thermo effects from converting a Starch in the case of Potatoes or Protein in the case of Meats into amino acids (AA's) and energy that the body can use. Now this affect may be in the order of 50% remembering that sitting in 27 deg c water (80f) increases the BMR by at least two times. So if all of a sudden my BMR is increase by 1.5 times for 24 hours I need 3300 cals plus any activity say 1.1 multiplier so I am up to 3600 cals. Now after 6 days on the Potato, rice and hot chili sauce diet I am eating an average of 1200 Cals. That leaves a deficit of 3600-1200 = 2400 meaning that I would lose ~ 2400/3500 * 2.2lbs fat = 1.5lbs of fat or energy needed per day.
Now I am 6 days in and have lost 10.8lbs, 10.8/6 = 1.8lbs per day pretty close to the above calcs.
Now again from my understanding if we are all ready fat adapted to burn fat from a pretty clean Paleo/Primal diet then I should access the fat in my body first, why would the body try and get energy from burning inefficient muscle mass, bones or organs?, surely it would access the BF first over a short period, long term starvation mode may kick in and there might be a reason why it would target Muscle and bones, but at ~20% BF I dont see why it would. So even through I am eating no fat I am actually on a high fat diet, my own body fat.
Now if your are on a high fat, low starch and medium Protein diet, then the body will use the fat first? From what I understand its easy for the body to burn and convert to fuel (note I need to read more about this). This will mean that the thermal affects to convert Protien or Starch to AA's and energy is lower. So the mutilpier may be as low as 1.1 or less. Using my example above 1.1*2200*1.1 = 2662 Cals, I know for a fact that I dont feel full on 1200 cals on a LCHF diet so would eat typically 1800-2000 cals giving a deficit of 2662-1800 = 800cals or ~ 5 days to see a 1lb loss
I do think some of the weight loss is water, glycogen, muscle mass and fat. I think a good percentage of it is fat as that is what the body would burn first. I think you could replicate the same weight loss on just a meat diet or green veggies, or vegan diet, or banana, if you keep the Calories to low enough deficit, Converting these to AA's or energy may not take the same thermal effort as starches or protein...
Interested to hear you opinions, pro or not on the above, as like most people on this site we are are here to learn, or if I have the science wrong some pointers would be great.
Cheers Not so Fat belly Frog
Last edited by fat belly frog; 11-12-2012 at 01:37 AM.
"Times fun when you are having Flies" Kermit the frog