RE: Book Review
Okay, Patrick, here's Gary Taubes' response to your questions:
(1) Once you are on a low carb diet, do calories (and dietary fat consumption) matter?
In my experience, they do. It appears that the higher one's intake of dietary fat, the lower the level of body fat burned off. This becomes more obvious the lower one's level of obesity (i.e., the obese can consume more fat and still lose weight, but as they lose weight there is a point below which this is no longer true). In my view, this explains some of the plateau issues that some people run into on low carb diets, and also suggests that to achieve optimal weight, at some point you need to add calorie and fat restriction on top of the low carb diet. What is his read?
This brings up a few points. Here's one: let's say you've plateaued, but now you want to cut carbohydrates as low as possible while keeping your total calories constant. To do so, you'll have to increase fat or protein content to compensate -- remember diet is a trade-off in this sense. You might increase both. You're likely to increase fat more. So in this scenario, fat intake goes up and weight probably comes down.
You're giving us another scenario: you plateau, cut calories and fat while calories from carbs remain low and constant. Now its possible this will lower weight further, but it raises the question of what is an ideal weight, and whether anyone will be able to keep this up. Remember, the idea is that your appetite is theoretically matched to your metabolic needs. If carbs are driving calories into your fat tissue, you consume more calories to make up the difference and keep the rest of your body adequately surprised. Now if you cut calories beneath what you're comfortable eating, you'll be hungry -- by definition -- and your metabolism might slow as a response to the reduction in energy supply. So, yes, you might lose a few more pounds, just as you would on any semi-starvation diet, but you'd do so at the cost of decreased energy and increased hunger. This is all speculation and it would be nice to test it to see if I'm right.
Now, back to the issue of optimal weight. In the book, I phrase my conclusions, as I do most everything else, pretty carefully. So I say "the less carbohydrates consumed, the leaner we will be," but I do not say we'll be as lean as we might like -- what I think you're describing as optimal weight. It seems likely to me that those prediposed to be very fat -- in other words, those that are the most sensitive to carbohydrates in the diet -- and those individuals who have been very fat for a long time will have trouble reversing this process entirely; that there is chronic damage done by the diets they've been consuming.
Thus, the leanest they'll be will be on the diet with the least carbohydrates, but that may still not be lean. They may lose 50 or 100 pounds and have another 40 or 50 to go, but weight loss stops because their fat tissue is so exceedingly sensitive to insulin that even the whiff of a taint of a carbohydrate in the diet will lock up fat and keep it there. Again, this may or may not be the case, but my reading of the literature suggests it is. Had they grown up in a world without refined carbs and sugars, they might have always been relatively lean. Having eaten diets high in refined carbs and sugars for a few decades, though, it's possible that they may never undo all the damage done, only some of it. It's also possible that it could take years or decades to do it, and that a six month plateau or a year plateau is just part of the process.
So maybe the way out of the plateau is to cut calories and fat, on top of the reduction in carbohydrates. Maybe the way out is to cut carbohydrates close to zero and keep fat and protein high. Maybe there's no way out. Again, this is the kind of thing I'd like to see tested. You could take a few dozen individuals who have plateaued on low-carb diets, and put half on, say, diets of only fatty meat and a "hotel portion" of green leafy vegetables -- the diet Pennington prescribed at Dupont in the 50s -- and put the other half on a calorie-restricted low-carb diet and see what happens. (Keeping in mind that we may have to run the test for a few years and do it as a feeding study to get meaningful results.)
(2) While Gary points out that exercise is largely ineffective as a weight control strategy in a "balanced" diet, does that change when you are on a low-carb diet?
In my experience, shifting to a low carb diet transforms exercise from an ineffective strategy to an effective one, particularly weight training. What does he think?
My personal experience is that it doesn't make any difference. Certainly not aerobic exercise. My take on the literature is that it also shouldn't make much difference. I have doubts as well about the benefits of weight training as a weight loss strategy, whether on a low-carb or a balanced diet -- but exercise physiologists whom I respect disagree. Again, this is the kind of thing I'd like to see tested. To the best of my knowledge, it never has been and our anecdotal experiences don't mean much.
Thanks for the thoughtful questions.
He really appreciated your questions, Patrick! Comments?
Jimmy Moore, "Livin' La Vida Low-Carb Discussion" forum owner
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(This post was last modified: 03-10-2009 10:28 AM by LindaSue.)
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