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#1
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"Set Point"
An interesting and long webpage interview.
http://home.comcast.net/~bkrentzman/obesity/liebel.html These studies are the kind I take seriously, because the test subjects were prisoners in the lab. It suggests that having body fat below one's set point triggers a 15% reduction in caloric burn rate. It seems to suggest that there is no "starvation mode," as a reaction to recent caloric intake. Also, of interest was the info that 30% of an obese person's extra weight is from lean tissues. It says that an obese person who is at his set point has the same metabolic efficiency as a non-obese person at their set point. I'm thinking that a low carb high fat diet changes the set point. This could alter the results of these studies. They were unquestionably done with what I would consider high carbs. It will be interesting to see the result of future studies on low carb high fat. |
#2
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"Cubit" writes: It suggests that having body fat below one's set point triggers a 15% reduction in caloric burn rate. It seems to suggest that there is no "starvation mode," as a reaction to recent caloric intake. Except that metabolic slowdown as a result of short-term dieting is a well-accepted fact, at least in weight lifting circles. Most "cutters" NEED to eat more every few days to keep their metabolism up. I think this is all related to leptin levels - leptin production depends (1) on stored body fat, and (2) on caloric intake. Leptin *sensitivity* determines your "set point". Between the three, they conspire to keep you at a given weight. This is also why it's harder to lose more as you approach your goal weight, and why obese people can diet harder and keep losing. Note that leptin sensitivity *can* be changed, but it's not easy, and it prefers changing towards more fat storage :-P Also, of interest was the info that 30% of an obese person's extra weight is from lean tissues. I figure 25% but yeah, it's not all fat. There's support tissue in there also. I'm thinking that a low carb high fat diet changes the set point. If anything, it would hurt it - leptin production is boosted by glucose in the fat cells. Less glucose = less leptin = more hunger. But that only matters when you eat above maintenance anyway. We know so little about the hormonal influences of metabolism that it's possible that the altered hormonal signature of a LC diet has all sorts of effects on your body, but we don't know if/what they are. |
#3
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"Cubit" writes: It suggests that having body fat below one's set point triggers a 15% reduction in caloric burn rate. It seems to suggest that there is no "starvation mode," as a reaction to recent caloric intake. Except that metabolic slowdown as a result of short-term dieting is a well-accepted fact, at least in weight lifting circles. Most "cutters" NEED to eat more every few days to keep their metabolism up. I think this is all related to leptin levels - leptin production depends (1) on stored body fat, and (2) on caloric intake. Leptin *sensitivity* determines your "set point". Between the three, they conspire to keep you at a given weight. This is also why it's harder to lose more as you approach your goal weight, and why obese people can diet harder and keep losing. Note that leptin sensitivity *can* be changed, but it's not easy, and it prefers changing towards more fat storage :-P Also, of interest was the info that 30% of an obese person's extra weight is from lean tissues. I figure 25% but yeah, it's not all fat. There's support tissue in there also. I'm thinking that a low carb high fat diet changes the set point. If anything, it would hurt it - leptin production is boosted by glucose in the fat cells. Less glucose = less leptin = more hunger. But that only matters when you eat above maintenance anyway. We know so little about the hormonal influences of metabolism that it's possible that the altered hormonal signature of a LC diet has all sorts of effects on your body, but we don't know if/what they are. |
#4
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"DJ Delorie" wrote in message ... "Cubit" writes: It suggests that having body fat below one's set point triggers a 15% reduction in caloric burn rate. It seems to suggest that there is no "starvation mode," as a reaction to recent caloric intake. Except that metabolic slowdown as a result of short-term dieting is a well-accepted fact, at least in weight lifting circles. Most "cutters" NEED to eat more every few days to keep their metabolism up. I think this is all related to leptin levels - leptin production depends (1) on stored body fat, and (2) on caloric intake. Leptin *sensitivity* determines your "set point". Between the three, they conspire to keep you at a given weight. This is also why it's harder to lose more as you approach your goal weight, and why obese people can diet harder and keep losing. Note that leptin sensitivity *can* be changed, but it's not easy, and it prefers changing towards more fat storage :-P The study addresses the leptin issue. Peace, Pen |
#5
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"DJ Delorie" wrote in message ... "Cubit" writes: It suggests that having body fat below one's set point triggers a 15% reduction in caloric burn rate. It seems to suggest that there is no "starvation mode," as a reaction to recent caloric intake. Except that metabolic slowdown as a result of short-term dieting is a well-accepted fact, at least in weight lifting circles. Most "cutters" NEED to eat more every few days to keep their metabolism up. I think this is all related to leptin levels - leptin production depends (1) on stored body fat, and (2) on caloric intake. Leptin *sensitivity* determines your "set point". Between the three, they conspire to keep you at a given weight. This is also why it's harder to lose more as you approach your goal weight, and why obese people can diet harder and keep losing. Note that leptin sensitivity *can* be changed, but it's not easy, and it prefers changing towards more fat storage :-P The study addresses the leptin issue. Peace, Pen |
#6
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On Mon, 20 Sep 2004, Cubit wrote:
An interesting and long webpage interview. http://home.comcast.net/~bkrentzman/obesity/liebel.html I'm thinking that a low carb high fat diet changes the set point. This could alter the results of these studies. They were unquestionably done with what I would consider high carbs. It will be interesting to see the result of future studies on low carb high fat. As a low carber of several years (roughly from when the Taubes article came out), and a data point of one, I have to say that my set point is exactly the same from having been on a low carb diet as it was when I was using other methods to lose weight. It is possible for me to lose weight below that point, but only by seriously ramping up my exercise and throttling back my calories. Since every time I've tried to get below it I've ended up rebounding higher, I've declared this my maintenance weight and am not actively seeking to diet away any more fat. Martha -- "ALPO is 99 cents a can. That's over SEVEN dog dollars!!" Revek - ASDLC |
#7
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On Mon, 20 Sep 2004, Cubit wrote:
An interesting and long webpage interview. http://home.comcast.net/~bkrentzman/obesity/liebel.html I'm thinking that a low carb high fat diet changes the set point. This could alter the results of these studies. They were unquestionably done with what I would consider high carbs. It will be interesting to see the result of future studies on low carb high fat. As a low carber of several years (roughly from when the Taubes article came out), and a data point of one, I have to say that my set point is exactly the same from having been on a low carb diet as it was when I was using other methods to lose weight. It is possible for me to lose weight below that point, but only by seriously ramping up my exercise and throttling back my calories. Since every time I've tried to get below it I've ended up rebounding higher, I've declared this my maintenance weight and am not actively seeking to diet away any more fat. Martha -- "ALPO is 99 cents a can. That's over SEVEN dog dollars!!" Revek - ASDLC |
#8
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I find these studies interesting. My husband has a ridiculously low body
fat percentage, but he eats whatever he wants and never puts on weight. Why? Exercise. Don't forget the importance of exercise as a factor in this equation. More specifically, however, I can tell you this with 100% certainty, because of all of the studies I have done on my own metabolism: on a low-carb diet I now get nearly 2/3 of my calories from fat (previously it was around 20% when I ate the low-fat way). I weigh 116, with a BMI of about 21....my fat level is good for my weight and height. I have discovered that on a low fat diet, without exercise, I was only able to eat 1450 calories a day without gaining weight. On low-carb, that number has risen to 1650-1700 calories a day without exercise. On either diet, I can increase my daily caloric intake more as I exercise more. I hope this helps...... |
#9
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I find these studies interesting. My husband has a ridiculously low body
fat percentage, but he eats whatever he wants and never puts on weight. Why? Exercise. Don't forget the importance of exercise as a factor in this equation. More specifically, however, I can tell you this with 100% certainty, because of all of the studies I have done on my own metabolism: on a low-carb diet I now get nearly 2/3 of my calories from fat (previously it was around 20% when I ate the low-fat way). I weigh 116, with a BMI of about 21....my fat level is good for my weight and height. I have discovered that on a low fat diet, without exercise, I was only able to eat 1450 calories a day without gaining weight. On low-carb, that number has risen to 1650-1700 calories a day without exercise. On either diet, I can increase my daily caloric intake more as I exercise more. I hope this helps...... |
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