Well, of course do we really know why Jimmy put a good bit of weight back on. It goes to my original question of how hard is it really to keep significant amounts of weight off. I personally have yo-yo'ed 3 times between 150 and 300ish and have to tell you it is REALLY easy to put weight back on VERY fast. In a 2 month period last winter, I managed to get back up to 175 by eating 'completely primal', but was eating things like almond flour 'paleo cookies', dates and walnut 'paleo balls', some dried fruit, nuts and tons of meat. But I really did take a pass on pies, cakes, anything that wasn't technically paleo ... and still put on 20 pounds.
Originally Posted by Grumpy Caveman
Reading this week's Gnolls: When Satiety Fails: Why Are We Hungry? Part IV he cites and interesting study that backs up lot's of people's N=1 experiences:
It turns out that:
- The obese have impaired metabolic flexibility.
- The obese have impaired mitochondrial capacity to turn nutrients into energy in the muscles.
- The obese have an impaired ability to oxidize fat for energy, which we can objectively measure.
- Both the formerly obese and the soon-to-be-obese also suffer these impairments.
Ranneries, C., Bulow, J., Buemann, B., Christensen, N. J.,
Madsen, J., & Astrup, A.
Fat metabolism in formerly obese women.
AJP – Endo January 1998 vol. 274 no. 1 E155-E161
“…Fat mobilization both at rest and during exercise is intact in FO [formerly obese], whereas fat oxidation is subnormal despite higher circulation NEFA levels. The lower resting EE [energy expenditure] and the failure to use fat as fuel contribute to a positive fat balance and weight gain in FO subjects.”
- Normal subjects are burning 30% more calories at rest than the formerly obese.
- Normal subjects are burning 7% carbs and 78% fat at rest, whereas formerly obese subjects are burning 49% carbs and 34% fat at rest!
So yeah, I think it is fair to say it's gonna take a lifelong effort to have any hope of maintaining where I am now at 165. In another of J. Stanton's articles, Regaining Your Metabolic Flexibility which suggests from the studies he cites that exercise is the key to regaining the ability to burn fat:
It turns out that exercise is important after all…not because of the calories you burn by exercising, which you usually replace right away because you’re hungry, but because it helps you regain metabolic flexibility. Exercise stimulates your body to burn more fat, both during exercise and at rest.
So, sorry Griff, it seems that just eating low carb and plenty of fat isn't enough to fix a broken system and get your body into fat burning mode.
To this end, I've been going to CrossFit Oakland and feel like I'm moving in the right direction again. I haven't been on the scale for a while, checking now ... 161.4. My weight hasn't changed that much since starting, but since starting at the beginning of the year, my body fat percentage, measured in a submersion tank that BodyFatTest.com sends out to CFO every few months, has gone from 19.9% at the start of the year to 17.8% on 7/12/2011. I'm shooting for 16% by October.