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#121
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Low carb diets
OmegaZero2003 wrote:
"Lyle McDonald" wrote in message ... Mirek Fidler wrote: and a standard low-calorie diet. Also, sticking to a low-carbohydrate diet doesn't appear to be any easier than following other weight-loss plans. People on the Atkins diet dropped out at a similar rate as those following the low-fat diet. If dieters aren't getting the results they want - anticipated weight loss - they drop out. This suggests that the low-carbohydrate diet, like so many diets, is no easier to stick to long term." http://www.mayoclinic.com/invoke.cfm...1-4F40-A099254 FDF10BCB1 I was thinking about this issue, as personaly for me low-carb menu seems to be much attractive than low-fat one. and that, IMO, is the bottom line. After all of these studies and 30+ years of research, the basic conclusion is that all diets work, as long as people follow them. And unless they are totally retarded, they all generate about teh same weight/fat loss (and for the majority of dieters, small differences in LBM retention are an irrelevancy; that only matters for athletes and bodybuilders and tha'ts a tiny percentage of the dieting public). Meaning this: pick the dietary approach (which is going to depend on personal food preferences, activity, etc) that YOU CAN BEST STICK TO. I have been saying this for years. Oh I agree with this 100%. But it is interesting to look at the mechanisms and theories. No doubt. But the more you look, the more you find it comes down, more or less to the above. I mean, fundamentally, weight loss is a function of eat less (or eat differently so that you automatically eat less) exercise (or not) repeat forever most of the mechanistic stuff has to do with determining the details of those 4 steps. What to eat and does it even matter what the composition of the diet is? Given a few requirements (which I stated previously), the differences are minor approaching 4/5th of **** all (they certainly aren't that important for your average obese individual; a few pounds either way may be huge for an athlete or bodybuilder). So all diets basically work as long as you reduce calories. One issue is whether or not the diet is going to be strictly controlled or you're allowing ad-lib intakes. If the latter, you need to pick a diet that spontaneously makes folks reduce food intake. Both low-fat and low-carb approaches have studies to back them (reducing fat tends to reduce calories in the short-term because of the high energy density, in that carbs typically make up 50% or more of the daily diet, reducing/removing them tends to reduce calories as well). High-fiber is key and protein is turning out to be the big player as it decreases hunger/appetite the most. A high fiber, high protein, low GI carb, and low to moderate fat diet would probably lead to the greatest spontaneous reduction in caloric intake. Exercise. What type, how much, how often? Studies are showing that exercise has a bigger role in preventing weight regain (but it takes a lot) than in causing weight or fat loss per se. Of course, most exercise studies use pretty paltry intervenions. Of course, the average person won't do/can't handle intense exercise, at least not at first. Repeat forever gets into adherence issues and is, IMO, where the real meat of the matter lays. Face facts, losing weight is NOT hard. People do it all the time. KEEPING the weight off is the problem and figuring out how to do that is where the key solution is as far as I'm concerned. That also ties in with diet composition: is a given diet relatively harder or easier to stick to. Very low fat diets tend to have poor compliance (so even though they generate weight/fat loss in the short-term, people get tired of eating cardboard and go off of them), a number of studies show that moderate fat diets (25-35% of total calories) do better. I'm unaware of any long term studies on low-carb diet adherence but I suspect it's going to be close to just as bad. Moderate carb diets allow a lot more food variety and probably have an advantage in this regards (compared to strict low carb diets). Same with moderate fat, they taste better and allow more food variety. On and on it goes. One of these days I'll write a real diet book and adress all of the above issues in the anal retentive detail I'm known for. Lyle |
#122
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Low carb diets
jmk wrote:
On 12/18/2003 1:35 PM, Lyle McDonald wrote: eat sufficient protein Lyle, I follow you up to a point but what are you calling sufficient protein? US RDA (or DRI or whatever it is these days)? WHO's recommendations? Some other amount? For dieting: 0.8-1 g/lb LBM. It's been known for over 30 years that protein requirements go up when calories go down which makes most of the standard recommendations (RDA, probably WHO) too low (they are based on maintaining body protein under normal dietary/non-stressed conditions). The PSMF studies determiend taht you need 1.5 g/kg LBM (they actually used ideal bodyweight as a proxy for lean body mass), or about 0.7 g/lb to limit LBM losses (while still allowing a sufficient caloric deficit). Of course, that's in extreme obesity (the more bodyfat you have, the less proetin you tend to lose). It's also without activity. For an active individual who is not extremely fat, .8-1 g/lb LBM would be the minimum I would consider sufficient. Lyle |
#123
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Low carb diets
Lyle McDonald wrote: and that, IMO, is the bottom line. After all of these studies and 30+ years of research, the basic conclusion is that all diets work, as long as people follow them. And unless they are totally retarded, they all generate about teh same weight/fat loss (and for the majority of dieters, small differences in LBM retention are an irrelevancy; If the focus is strictly on weight loss then what you both have said seems obvious, at least to some of us. When one introduces additional notions such as, likelihood of staying on it, overall health concerns which dovetails into quality of life, sprinkle in some exercise, the discussion gets interesting and sometimes heated. Someone realized that I post from sci.med.nutrition. I have been in and out of SMN for years and regardless of the number of degrees and experience there is very little agreement on nutrition. I listen in and get a few weeks of my daddy can beat up your daddy and put it on the back burner. I would say most people agree that simple carbs aka empty calories could be eliminated from everyone's diet and lose nothing but possibly some weight. We have churned for years the amounts, contents and proportions of pro/car/fat. Anyone think over the next 5-10 years anything will be concluded? Until that time most pick their horse, dig up some justification studies, with the studies themselves coming under fire, and ride their horse. -- Doug Freese "Caveat Lector" |
#124
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Low carb diets
On 12/18/2003 2:10 PM, Lyle McDonald wrote: jmk wrote: On 12/18/2003 1:35 PM, Lyle McDonald wrote: eat sufficient protein Lyle, I follow you up to a point but what are you calling sufficient protein? US RDA (or DRI or whatever it is these days)? WHO's recommendations? Some other amount? For dieting: 0.8-1 g/lb LBM. It's been known for over 30 years that protein requirements go up when calories go down which makes most of the standard recommendations (RDA, probably WHO) too low (they are based on maintaining body protein under normal dietary/non-stressed conditions). OK, so if I weighed 150 and wanted to weigh 135 and was on a diet, I would need to consume at least .8 g/lb (120 g/day) but if I weigh 135 and I am maintaining at that weight .36 g/lb of protein (48.6 g/day) is fine? (WHO's would be much lower at 27.5 g/day.) -- jmk in NC |
#125
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Low carb diets
jmk wrote:
On 12/18/2003 2:10 PM, Lyle McDonald wrote: jmk wrote: On 12/18/2003 1:35 PM, Lyle McDonald wrote: eat sufficient protein Lyle, I follow you up to a point but what are you calling sufficient protein? US RDA (or DRI or whatever it is these days)? WHO's recommendations? Some other amount? For dieting: 0.8-1 g/lb LBM. It's been known for over 30 years that protein requirements go up when calories go down which makes most of the standard recommendations (RDA, probably WHO) too low (they are based on maintaining body protein under normal dietary/non-stressed conditions). OK, so if I weighed 150 and wanted to weigh 135 and was on a diet, I would need to consume at least .8 g/lb (120 g/day) but if I weigh 135 and I am maintaining at that weight .36 g/lb of protein (48.6 g/day) is fine? Assuming no activity, I have no problem with that in terms of meeting nutritional requirements (whether more protein might be beneficial in terms of other things is a different question than what you're asking). (WHO's would be much lower at 27.5 g/day.) Do note that the WHO is mainly concerned with protein intakes for basic health and they are dealing with a lot of situations like 3rd world countries. The RDA may be on the high side (except for energy intakes) and are typiocally estimated by determining bare minimums and adding one or two standard deviations (in theory, this accounts for 97% of individuals, because of variance in utilization). But in situations where protein is not readily available (3rd world countries), the RDA correction may be inappropriate (hence the WHO value, IMO). Lyle |
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Low carb diets
Doug Freese wrote:
Lyle McDonald wrote: and that, IMO, is the bottom line. After all of these studies and 30+ years of research, the basic conclusion is that all diets work, as long as people follow them. And unless they are totally retarded, they all generate about teh same weight/fat loss (and for the majority of dieters, small differences in LBM retention are an irrelevancy; If the focus is strictly on weight loss then what you both have said seems obvious, at least to some of us. When one introduces additional notions such as, likelihood of staying on it, overall health concerns which dovetails into quality of life, sprinkle in some exercise, the discussion gets interesting and sometimes heated. I mentioned that in a different post. There are other issues that factor into optimal diet choice. Activity is one, potential health issues is another, there are certainly others. Someone realized that I post from sci.med.nutrition. Explaining why you are a total dip**** (I'm basing this on your moronic carb and exercise arguments, just so you know). I have been in and out of SMN for years and regardless of the number of degrees and experience there is very little agreement on nutrition. I listen in and get a few weeks of my daddy can beat up your daddy and put it on the back burner. I would say most people agree that simple carbs aka empty calories could be eliminated from everyone's diet and lose nothing but possibly some weight. We have churned for years the amounts, contents and proportions of pro/car/fat. Anyone think over the next 5-10 years anything will be concluded? Yes: Moderation in all things. My grandmother knew this 50 years ago and many nutrition studies are coming to the same basic conclusion. Both extremely low-fat and extremely high-fat diets can cause health problems (low-fat can raise triglcyeride levels and increase small LDL particles; high fat has a separate set of problems although it depends on the rest of the diet). Same for protein (tho the risk of 'high-protein' are drastically overstated). High-carb diets (esp if the carbs come from refined sources and, let's face it, they do in modern diets) cause all kinds of problems. Lowcarbs can or can not be a problem depending on other specifics. for the majority of individuals, I feel that a diet containing 1. ~25-30% dietary protein (in the realm of .8-1 g/lb LBM) 2. 25-35% dietary fat (from mostly healthy/monounsaturated sources): I use .45 g/lb as a pulled out my ass value for now (it's about 25-30% at maintenance calories) 3. the remainder carbs: preferably less refined. Meaning that, at most, carbs are going to be 50% of total calories. They can go lower but, unless you're talking about elite endurance performance, there's rarely a need to go higher. 4. High fiber (goes with 3) 5. Allow one or two don't worry about it, eat whatever the **** you want meals per week to get it out of your damn system. is probably about right. There are outliers to any such schema. Elite endurance athletes may need relatively more carbs (of course, their total claorie intakes go through the roof so their absolute carb intakes will go up). Folks with severe insulin resistance may need to reduce carbs further for health reasons and/or to control calories. Lyle |
#127
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Low carb diets
On 12/18/2003 2:24 PM, Lyle McDonald wrote: jmk wrote: On 12/18/2003 2:10 PM, Lyle McDonald wrote: jmk wrote: On 12/18/2003 1:35 PM, Lyle McDonald wrote: eat sufficient protein Lyle, I follow you up to a point but what are you calling sufficient protein? US RDA (or DRI or whatever it is these days)? WHO's recommendations? Some other amount? For dieting: 0.8-1 g/lb LBM. It's been known for over 30 years that protein requirements go up when calories go down which makes most of the standard recommendations (RDA, probably WHO) too low (they are based on maintaining body protein under normal dietary/non-stressed conditions). OK, so if I weighed 150 and wanted to weigh 135 and was on a diet, I would need to consume at least .8 g/lb (120 g/day) but if I weigh 135 and I am maintaining at that weight .36 g/lb of protein (48.6 g/day) is fine? Assuming no activity, I have no problem with that in terms of meeting nutritional requirements (whether more protein might be beneficial in terms of other things is a different question than what you're asking). I think that we may have a disconnect here. What I am asking is what you are referring to as suffient protein in a previous post -- "Comparing an RDA protein diet to a lowcarb diet with double the protein is a **** poor comparison but that's a lot of what's going on. Yeah, of course, the lowcarb diet will work better. Because it has sufficient protein." In this context, what do you feel is sufficient for weight loss? for maintenance? -- jmk in NC |
#128
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Low carb diets
OmegaZero2003 wrote:
"Seth Breidbart" wrote in message What they all had in common, however, was that calories were restricted to about 1,100 per day and the diets lasted about four to five months." Losing the most weight requires the fewest calories per day, sure. What were the results for people who dieted for even longer than 4-5 months? I posted a few recent studies of 6m-1yr. all those studies came after the big meta-analysis came out. Nutrient partitioning effects, theoretically - although Lyle's readings tell a different story. I can also report empirically the feedback I've gotten. This was from a few years ago (on the lowcarb-l list) from folks comparing things like Isocaloric (33/33/33) diets to Bodyopus (CKD) types of diets. These were motivated bodybuilder/athletic types who are known for being anal compulsive about their diet and who were using similar protein inakes and caloric deficits (and weight training and the rest). At *most*, the variance in fat loss/LBM loss was ~3 lbs over 12 weeks. That is, they might report 3 lbs more fat lost and 3 lbs more LBM maintained over that period. Adding: a. Even then, the effects weren't consistent. Some folks did better on CKD's, some folks better on Isocaloric (and lost more muscle on the CKD). Meaning there was no consistent pattern with one diet being absolutely superior. Note: studies from Blundell and Rolls are supporting the idea of high and low fat phenotypes, bascially folks who differ in how they adapt to higher and low fat intakes (some resisting obesity despite a high fat intake). The mechanisms are obscure at this point with the only measure they had done finding that sleeping heart rate was higher in the high-fat phenotype (as I recall). This suggests higher SNS output, probably a function of high leptin, insulin, etc. sensitivity. This would make some sense considering the other effects of that axis (and other studies such as Levine's NEAT studies) which contribute to what's going on. Unfortunately, I have no way to predict who might or might not do better on one diet vs. the other except in the vaguest sense. And that has more to do with a choice by exclusion: folks who feel well/do well on high-carb/low-fat diets tend to do terribly on low-carbs (they just never adapt) and vice versa (some folks seem to have the metabolic flexibility to go either way). b. 3 lbs is within measurement error (sorry, this is the cynic in me speaking). Hell, it's within the error of glycogen and water balance. c. 3 lbs of fat vs LBM is hardly relevant for the majority of dieters. For an athlete or bodybuilder, yeah, it matters. But without a consistently superior diet or a way to know who will be ideally suited for one or the other, the above is kind of meaningless (at this point, there's no good way to apply it). Lyle |
#129
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Low carb diets
jmk wrote:
On 12/18/2003 2:24 PM, Lyle McDonald wrote: jmk wrote: On 12/18/2003 2:10 PM, Lyle McDonald wrote: jmk wrote: On 12/18/2003 1:35 PM, Lyle McDonald wrote: eat sufficient protein Lyle, I follow you up to a point but what are you calling sufficient protein? US RDA (or DRI or whatever it is these days)? WHO's recommendations? Some other amount? For dieting: 0.8-1 g/lb LBM. It's been known for over 30 years that protein requirements go up when calories go down which makes most of the standard recommendations (RDA, probably WHO) too low (they are based on maintaining body protein under normal dietary/non-stressed conditions). OK, so if I weighed 150 and wanted to weigh 135 and was on a diet, I would need to consume at least .8 g/lb (120 g/day) but if I weigh 135 and I am maintaining at that weight .36 g/lb of protein (48.6 g/day) is fine? Assuming no activity, I have no problem with that in terms of meeting nutritional requirements (whether more protein might be beneficial in terms of other things is a different question than what you're asking). I think that we may have a disconnect here. What I am asking is what you are referring to as suffient protein in a previous post -- "Comparing an RDA protein diet to a lowcarb diet with double the protein is a **** poor comparison but that's a lot of what's going on. I mean doing so in a study under dieting conditions. Isn't that what we have been talking about this whole time? That is, putting two groups at 1000 cal/day deficit and giving one the RDA for protein and one double that and seeing different results is no surprise. Of course the second diet works better because the first is protein insufficient. comparing protein intakes under dieting conditions to protein intakes under non-dieing conditions is meaningless. Yeah, of course, the lowcarb diet will work better. Because it has sufficient protein." In this context, what do you feel is sufficient for weight loss? for dieting: .8-1 g/lb LBM (is there an echo in here?) for maintenance? Assuming no activity, RDA should be fine from a purely LBM standpoint. The RDA is ostensibely defined as being sufficient to meet daily requirements (and in the case of protein, maintenance of LBM is one of the end points) under non-stressed conditions. Again, it's actually determined by figuring out minimal (or sometimes average) intake requiremnts and adding 2 standard deviations (the exception being calorie requirements which do not have the 2 SD's added). Exercise and dieting both counts as stress and both increase protein requirements. Again, whether a higher protein intake would be beneficial in other regards such as appetite (two recent abstracts, referred to in the Westerterp-Plantenga paper I cited showed that higher protein helped limit weight regain) or health (several studies have linked a HIGHER protein intake to lowered blood pressure) is a different situation. Lyle |
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Low carb diets
"Lyle McDonald" wrote in message ... OmegaZero2003 wrote: "Lyle McDonald" wrote in message ... OmegaZero2003 wrote: You might note one of the comments I made in one of my responses to you: Most studies supporting the idea of this type of effect are comparing inadequate protein to adequate protein. Once you get protein to a sufficient level, changing around carbs and fats does very little. Also, the difference in teh Layman studies were TINY. They only got significance with some keen statistical game playing. Yes - but some diets increase the fat more than the protein. So what? Fat is just energetic ballast. And probably some therfore have inadequate protein. WOuld like to see a studt with those parameters. I'd like to see a lot of studies in terms of setup. One would be a study comparing a. adequate protein: 0.8-1 g/lb LBM and EFA's b. moderate caloric deficit: 20% below maintenance c. with weight training d. shuffle around carbs and fat within those parameters Because that's really the type of dieting situation I'm talking about when I say I don't think the composition of the diet matters (in terms of real world weight, fat and LBM loss; issues of adherence and exercise performance are separate). There are some built in requirements and qualifications. Comparing an RDA protein diet to a lowcarb diet with double the protein is a **** poor comparison but that's a lot of what's going on. Yeah, of course, the lowcarb diet will work better. Because it has sufficient protein. Not because of the low-carbs per se. Yet the insulin effect of switching form hi-GI to low-G (or Hi-II to low II) carbs is established. Likewise the effects of more fiber (hi-fiber carbs being recommended for the carbs one does ingest) slowing the response. When one lowers the carbs, in most if not all low-carb diets I have seen, the carbs ingested are suggested to be the low-GI/II type, along with taking in adequate fiber. All independent of protein intake. Now before you jump all over me, I know that of course combining carbs with the protein elicits a higher insulin response even with lower-GI foods (Schenk et al). I think it is certain that the low-carb approach affects composition more from the insulemic effects than from getting adequate protein as a replacement for the carbs. Especially longer-term where sensitivity changes occur ( 3 months or so). Im talking non-obese, with normal fasting insulin and glucose levels (no peripheral insulin resistence) to start with. E.g., the antilipolytic effects and lipogenesis. Thnik about this: if the dieters are consumming that greater amount of protein that you say is what is happening in the studies,one would expect those people to be getting fatter and/*or* more insulin resistent considering the protein effect on insulin release. I don;t think that is what is being seen. In fact the opposite is being seen. I.e., in Schenk's study, the glucose disposal was not significantly different between a hi-GI and low-GI because in the low-GI group, the extra protein (with the carbs taken) elicited a significant insulin response which would have led to thethe antilipolytic effects and lipogenesis effect . Also, think about the increased EFAs that usually come with a rec. to go on a low-carb diet. That also augers for a more reasonable insulemic response. As does timing and food combinations. All independent of gross protein intake. I believe Kasper & Theil et al showed this in *non-obese* individuals (1) So there is certainly something happening beyond getting the adequate protein. The low-carb diets end up changing the food combinations as well. I mean if you are only gonn get from 30-200 gms -o-carbs per day (depending on how low carb you are gonna go), then you are mostly, automatically, ensuring that the food combinations you *used* to eat (those that most assuradly had a fiar amount of carbs in *each* meal), are now gonna be meals with a goodly-amount less carbs in each meal. SInce you are upping, usually, both protein and fats (good presumably), some or all meals will have the effect preventing large insulin releases with the attendent effects. What is interesting is that even from the Cleveland Clinic (2), present lots of studies (the paper referenced is a review of studies of sorts) and say that the criticisms of the diet lack scientific evidence. Those that bash studies because of confounding factors or the study population are missing the ****ing point. They also point out that weight loss goes "beyond water loss and includes suppression of appetite, decreasing metabolic efficiency and shunting nutrients away from fat storage". Of course they (as do all researchers) say further study is warranted. No ****! I do not have a dog in this fight as I do not really care about a low-carb diet vs other diets. But the basic physiological mechansims underlying success with such are similar across many types of individuals. Other than that, perhaps your main point is that it doesn;t matter as people lose on diets that they stick to regardless of type. But given that an individual is going to choose *a* diet, it makes sense to choose one that provides as many metabolic goodies as possible. Low-carb (and thence upiing EFS and protein) offers that I believe. And I think you do too - right? You said below that (a) would have to be explained. That is a tough one and I am taking your word that the results in the (a) group show what you claim. It just seems that something is being missed given the theory of how all this is supposed to work. Your statement below: "The most parsimonious conclusion is that differences in food intake (whether real or simply reported) under uncontrolled conditions is causing the difference." is revealing as is the bodybuilder statement. But since adequate studies have not been done to falsify the hypothesis (or combination of hypotheses since the low-carb diet is manifest in so many possible configuration), the theory (that low-carb diets without calorie decrease work to alter body composition) is supported by some data (that data about insulin's effect on lipolysis etc.). I have not seen a study (and this may be the issue you are calling out) that shows that in normal populations (no confounding factors such as obesity or diabetes) , a low-carb diet (with no lowered caloric intake) does NOT result in altered body composition. True? 1 Kasper H, Thiel H, Ehl M. Response of body weight to a low carbohydrate, high fat diet in normal and obese subjects. 2 JEFF S. VOLEK, PhD, RD* Assistant Professor, University of Connecticut; Human Performance Laboratory, Department of Kinesiology, University of Connecticut, Storrs ERIC C. WESTMAN, MD, MHS* Associate Professor, Division of General Medicine, Department of Medicine, Duke University Medical Center, Durham, NC CLEVELAND CLINIC JOURNAL OF MEDICINE VOLUME 69 . NUMBER 11 NOVEMBER 2002 Very-low-carbohydrate weight-loss diets revisited no *enforced* calorie restriction. Studies of ad-lib caloric intakes on low-carb diets indicate spontaneous low caloric intakes, in the 1400-2000 cal/day range. Hmmm. Certainly not stated there. A huge problem with many of the recent lowcarb vs. lowfat studies is that they are a. allowing ad-lib intakes b. relying on food reporting to get caloric intake estimates (noting that people misreport horribly) Admittedly, this is more representative of real world dieting situations but it makes conclusions hard to draw. As I said, studies clearly show that people reduce calories on ad-lib intakes on low-carbs. As I also pointed out, protein intake frequently changes pretty drastically. Such studies are terribly uncontrolled and are turning up conclusions that go directly against the bulk of controlled studies (studies where subjects are given a fixed amount of food and every calorie and nutrient is accounted for). basically, we have two data sets: a. controlled calorie studies (frequently done in hospital situations): these almost always show that, given adequate protein anyhow, non-retarded calorie levels, and a few others, differences in true weight or fat loss (or LBM sparing) are negligble (if they show up at all) b. uncontrolled studies which show vast differences among diets Now, any good model has to include all of the studies. And if you're going to argue that lowcarb gives all of these magical effects (what the studies in group 'b' suggest), you have to be able to explain why the studies in group a did NOT show that effect. That is, if under uncontrolled conditions, a lowcarb diet shows double the weight and fat loss, how come the same thing isn't seen in controlled studies? The most parsimonious conclusion is that differences in food intake (whether real or simply reported) under uncontrolled conditions is causing the difference. Of course, this can still be used as a pro-lowcarb argument (making a tangent here). If going to lowcarb gets the average person to spontaneously eat sufficient protein and reduce caloric intake (compared to a low-fat diet), that's fantastic. Frankly, I'm all for it. but it doesn't really tell you anything useful about something like an athlete or bodybuilder who will be controlling all of those variables fairly strictly. They will ensure adequate protein no matter what the rest of teh diet looks like, they will be counting calories strictly, etc, etc. Studies with enforced intake? Don't know what you're asking here. By enforced intake, I mean studies where caloric intake is being controlled and both groups are being given the same number of calories (instead of being told to follow a diet and then having them self-report their caloric intake). Lyle |
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