Energy expenditure adjusted for body weight

[Guest guest]

Below is the study Rodney referred to about underreporting of calories:

>

> One more, and the one I think may matter the most when dealing with

" free living " individuals and trying to calculate all of this..

>

>

>

> Discrepancy between reported and actual energy intake and expenditure

>

> A subset of obese patients believe that they are unable to lose

weight despite careful adherence to a low-calorie diet (<1200 kcal/d).

These patients often assume that a metabolic defect in energy

metabolism is responsible for their difficulty in losing weight. This

figure shows the results of a study involving 10 patients (1 man, 9

women) who had repeatedly failed to lose weight despite multiple

attempts with low-calorie diet therapy [1]. All patients were placed

on a low-calorie diet for 14 days. Measures of total daily energy

expenditure, by using the doubly-labeled water technique, and

self-reported dietary intake were obtained throughout the study. Body

composition, measured by hydrodensitometry, was determined at the

beginning and end of the study. Actual food intake was calculated from

measures of total energy expenditure and changes in body composition.

The data demonstrated that these subjects reported good compliance

with their diet and activity program, but under-reported their actual

energy intake by 47% and over-reported their actual physical activity

by 51%.

>

> Lichtman SW, Pisarska K, Berman ER, et al. Discrepancy between

self-reported and actual caloric intake and exercise in obese

subjects. N Engl J Med 1992;327:1893-1898.

>

[Guest guest]

Thanks for those refs: No argument.

[ ] Energy expenditure adjusted for body weight> Date: Mon, 07 Aug 2006 00:51:23 -0000> > Below is the study Rodney referred to about underreporting of calories:> > > > > >> > One more, and the one I think may matter the most when dealing with> "free living" individuals and trying to calculate all of this..> >> >> >> > Discrepancy between reported and actual energy intake and expenditure> >> > A subset of obese patients believe that they are unable to lose> weight despite careful adherence to a low-calorie diet (<1200 kcal/d).> These patients often assume that a metabolic defect in energy> metabolism is responsible for their difficulty in losing weight. This> figure shows the results of a study involving 10 patients (1 man, 9> women) who had repeatedly failed to lose weight despite multiple> attempts with low-calorie diet therapy [1]. All patients were placed> on a low-calorie diet for 14 days. Measures of total daily energy> expenditure, by using the doubly-labeled water technique, and> self-reported dietary intake were obtained throughout the study. Body> composition, measured by hydrodensitometry, was determined at the> beginning and end of the study. Actual food intake was calculated from> measures of total energy expenditure and changes in body composition.> The data demonstrated that these subjects reported good compliance> with their diet and activity program, but under-reported their actual> energy intake by 47% and over-reported their actual physical activity> by 51%.> >> > Lichtman SW, Pisarska K, Berman ER, et al. Discrepancy between> self-reported and actual caloric intake and exercise in obese> subjects. N Engl J Med 1992;327:1893-1898.> >>

[Guest guest]

Hey, it lifts my spirit to see someone critically evaluating the material.

I agree none can blame anyone else for their own situations, whatever they

are. I just say, along with , neither should we judge anyone else. And

beer may be more to the point than Macs, for many. However, it is a fact

that the food that is commonly available is contributing to obesity in over

half the population, and that makes it a pandemic problem.

And not only does it get very complicated with obese people, but even the

basic calorie content changes according to the treatment of food (toast has

more calories than the same piece of bread, untoasted, even if it has less

weight) and a bomb calorimeter is not a very refined way of estimating the

calories a body sees from from food. The way a bomb calorimeter oxidizes

food, and the efficiency, are different than the way of a living body.

Best,

Kayce

From: " jwwright " <jwwright@...>

Thanks for those refs: No argument.

[ ] Energy expenditure adjusted for body weight

> Date: Mon, 07 Aug 2006 00:51:23 -0000

>

> Below is the study Rodney referred to about underreporting of calories:

>

>

>

>

> >

> > One more, and the one I think may matter the most when dealing with

> " free living " individuals and trying to calculate all of this..

> >

> >

> >

> > Discrepancy between reported and actual energy intake and expenditure

> >

> > A subset of obese patients believe that they are unable to lose

> weight despite careful adherence to a low-calorie diet (<1200 kcal/d).

> These patients often assume that a metabolic defect in energy

> metabolism is responsible for their difficulty in losing weight. This

> figure shows the results of a study involving 10 patients (1 man, 9

> women) who had repeatedly failed to lose weight despite multiple

> attempts with low-calorie diet therapy [1]. All patients were placed

> on a low-calorie diet for 14 days. Measures of total daily energy

> expenditure, by using the doubly-labeled water technique, and

> self-reported dietary intake were obtained throughout the study. Body

> composition, measured by hydrodensitometry, was determined at the

> beginning and end of the study. Actual food intake was calculated from

> measures of total energy expenditure and changes in body composition.

> The data demonstrated that these subjects reported good compliance

> with their diet and activity program, but under-reported their actual

> energy intake by 47% and over-reported their actual physical activity

> by 51%.

> >

> > Lichtman SW, Pisarska K, Berman ER, et al. Discrepancy between

> self-reported and actual caloric intake and exercise in obese

> subjects. N Engl J Med 1992;327:1893-1898.

> >

>

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[Guest guest]

>>> rye bread, 28.3 grams

> untoasted = 73

> toasted = 80

>

> Funny how there are almost no absolute facts.

There is really a very simple explanation for this...

.... toasted rye bread has less water, yet both are

being measured at 28.3 grams...

so, the toasted rye bread has more calories and that

shouldnt be a suprise because as measured at the same

28.3 grams, with less water, it has more protein, carb

and fat. If you go to the original source, which is

the USDA database online SR-18 you can get all the

exact figures....

Rye Bread (28.35)

2.41 protein, .94 fat, and 13.69 carb, 10.57 water, 73

calories

Toasted Rye Bread (28.35)

2.66 protein, 1.02 fat, 15.05 carb, 8.79 Water, 81

calories

This is 1.61 difference in carb/protein which is 6.44

calories

And .08 in fat which is .72 calories.

Together .72 and 6.44 is 7.44

73 + 7.44 equals 80.44 or (if you dont mind) rounded

up to 81.

Now, If you took the exact same piece and measured the

calories before and after toating, this same piece

would " weigh " less after toasting (due to water loss)

but have the same calories and nutrients

Yes, how long it was toasted, at what temperature, the

humidity in the room, would all be variables, that

would effect the outcome, but it doesnt mean there are

no absolute facts...(After all, wouldnt that in and of

itself, then be an absolute fact??)

Regards

Jeff

PS the caloric difference in toasted rye bread vs

plain is not causing the obesity epidemic.