Re: Obesity linked to bad bones, study

[Guest guest]

Bone density bears a relationship to muscle mass,

since muscle tissue is attached to the bones. The

bigger the muscles, the denser the bones will become,

in order to support them. Excess fat offers no

advantages for bone mass, and can cause undue stress

on the joints.

--- bill4cr <bill4cr@...> wrote:

>

> I thought obsesity was good for bone strength

> because of the

> additional weightbearing?

>

> Obesity linked to bad bones, study

>

> By staff reporter

> 11/27/2007- The list of health problems associated

> with obesity

> continues to grow, with a new study linking excess

> body fat with poor

> bone health.

>

> Published in the November issue of the American

> Journal of Clinical

> Nutrition, the new study found that the bones of

> people with high body

> fat were eight to nine percent weaker than those of

> normal body fat

> participants.

>

> Obesity has already been repeatedly linked to an

> increased risk of

> heart disease, stroke, diabetes, cancer, and a host

> of other health

> conditions.

>

> These growing health risks have already put

> significant pressure on

> the food industry for the role it plays in promoting

> unhealthy eating,

> pressure which is augmented by these latest

> findings.

>

> " Obesity is an epidemic in this country, and I think

> this study is

> critical because it highlights another potential

> negative health

> effect that people haven't considered, " said study

> co-author

> , professor of foods and nutrition at the

> University of Georgia

> College of Family and Consumer Sciences.

>

> and his team conducted advanced

> three-dimensional bone scans on

> 115 women aged 18 and 19 with normal (less than 32

> percent) and high

> (greater than 32 percent) body fat.

>

> After adjusting for differences in muscle mass

> surrounding the bones,

> they found that overweight participants had less

> healthy bones.

>

> said the exact mechanisms by which excess fat

> hinders bone

> strength are unclear, but studies of obese rats show

> that they produce

> more fat cells in the bone marrow and fewer bone

> cells. Since fat and

> bone cells originate from the same precursor, it may

> be that fat cell

> production is favored over bone cell production in

> obese people.

>

> Childhood obesity could be particularly detrimental

> to bone health.

>

> " When you're young you have the capacity to change

> the shape of your

> bones, but when you get older you don't have that

> capacity. And

> because of that, childhood obesity could have a

> significant, long

> lasting negative impact on the skeleton, "

> said.

>

> Obesity is currently thought to affect more than 64

> percent of the

> US's adult population and 16 percent of children.

>

> The condition, which has been repeatedly linked to

> increased risk for

> heart disease and diabetes, has been the bane of the

> food industry in

> recent years, with food firms often receiving much

> of the blame for

> the nation's increasing obesity rates.

>

>

>

> Is adiposity advantageous for bone strength? A

> peripheral quantitative

> computed tomography study in late adolescent

> females1,2,3

> Norman K Pollock, Emma M Laing, Clifton A Baile,

> Mark W Hamrick,

> B Hall and D

>

> 1 From the Departments of Foods and Nutrition (NKP,

> EML, CAB, and RDL)

> and Statistics (DBH), The University of Georgia,

> Athens, GA, and the

> Department of Cellular Biology and Anatomy, Medical

> College of

> Georgia, Augusta, GA (MWH)

>

> Background: Whereas excess adiposity is presumed to

> be advantageous

> for the skeleton, studies investigating relations

> between bone

> strength and fat during youth have been equivocal.

>

> Objectives: Relations of percentage body fat (BF)

> and bone strength

> indexes were assessed in late adolescent females,

> taking into

> consideration surrogates of muscle force [ie, muscle

> cross-sectional

> area (MCSA) and bone length]. Bone measurements in

> the normal- and

> high-fat groups were also compared.

>

> Design: Late adolescent females (n = 115; aged 18.2

> ± 0.4 y)

> participated in this cross-sectional study. Fat-free

> soft tissue mass,

> fat mass, and percentage BF were measured with the

> use of dual-energy

> X-ray absorptiometry. Tibial and radial peripheral

> quantitative

> computed tomography measurements were taken at the

> 4% (trabecular

> bone), 20% (cortical bone), and 66% (for measurement

> of MCSA) sites

> from the distal metaphyses.

>

> Results: Percentage BF was inversely related to

> radial cortical bone

> area, total bone cross-sectional area (CSA),

> cortical bone mineral

> content (BMC), periosteal circumference, and

> strength-strain index

> (SSI) (20% site; all P < 0.05). After control for

> MCSA and limb

> length, negative relations remained between

> percentage BF and radial

> measurements and were also observed at the tibia

> (20% site).

> Unadjusted bone measures were not different between

> groups. After

> control for MCSA, the high- compared with the

> normal-fat group had

> lower bone measures at the 20% site (cortical bone

> area and cortical

> BMC at the tibia, total bone CSA at the radius, and

> SSI at both the

> tibia and radius; P < 0.05 for all).

>

> Conclusion: Excess weight in the form of fat mass

> does not provide

> additional benefits, and may potentially be

> negative, for adolescent bone.

>

>

[Guest guest]

Hi All, The pdf of the paper is availed, but it seems apparent that it is % body fat, in which there is less % body muscle, that is examined. Naturally, less muscle corresponds to less bone strength. Also, the stress of excess weight is beneficial for bones, although certainly not for the joints. Cheers, Al Pollock NK, Laing EM, Baile CA, Hamrick MW, Hall DB, RD.Is adiposity advantageous for bone strength? A peripheral quantitative computed tomography study in late adolescent females.Am J Clin Nutr. 2007 Nov;86(5):1530-8.PMID: 17991669 ... RESULTS: Percentage BF was inversely related to radial cortical bone area, total bone cross-sectional area (CSA), cortical bone mineral content (BMC), periosteal circumference, and strength-strain index (SSI) (20% site; all P < 0.05). After control for MCSA and limb length,

negative relations remained between percentage BF and radial measurements and were also observed at the tibia (20% site). Unadjusted bone measures were not different between groups. After control for MCSA, the high- compared with the normal-fat group had lower bone measures at the 20% site (cortical bone area and cortical BMC at the tibia, total bone CSA at the radius, and SSI at both the tibia and radius; P < 0.05 for all). CONCLUSION: Excess weight in the form of fat mass does not provide additional benefits, and may potentially be negative, for adolescent bone. claire roberts-torres <robertstorres@...> wrote: Bone density bears a relationship to muscle mass,since muscle tissue is attached to the bones. Thebigger the muscles, the denser the bones will become,in order to support them. Excess fat offers noadvantages for bone mass, and can cause undue stresson the joints.

--- bill4cr <bill4cr (DOT) com> wrote: > I thought obsesity was good for bone strength> because of the> additional weightbearing?> > Obesity linked to bad bones, study> By staff reporter> 11/27/2007- The list of health problems associated> with obesity> continues to grow, with a new study linking excess> body fat with poor> bone health.> > Published in the November issue of the American> Journal of Clinical> Nutrition

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[Guest guest]

I would think that the additional 'carry' weight especially above the

hip in the overweight individuals would increase impact stresses and

strains with every step to bones of the lower extremities.

Weightbearing tends to increase bone mass, not diminish it. An

overweight person has more total mass, just moving this additional

mass, raising and lowering of the overweight arms and legs etc through

space against gravity should stimulate additional bone overall

throughout the body. Larger muscles do pull on and bend bones more

than a smaller muscle but a larger mass of any sort should also, i

would think.. puzzling

> > I thought obsesity was good for bone strength

> > because of the

> > additional weightbearing?

> >

> > Obesity linked to bad bones, study

> > By staff reporter

> > 11/27/2007- The list of health problems associated

> > with obesity

> > continues to grow, with a new study linking excess

> > body fat with poor

> > bone health.

> >

> > Published in the November issue of the American

> > Journal of Clinical

> > Nutrition

>

>

> ---------------------------------

> Looking for last minute shopping deals? Find them fast with

Search.

>

[Guest guest]

NOTE the following statement contained in this article:

" Obesity is currently thought to affect more than 64 percent of the

US's adult population and 16 percent of children. "

I certainly hope that is not true! My understanding is that about 2/3

of adults are overweight, but " only " about 1/3 are obese?

-Dave

>

>

> I thought obsesity was good for bone strength because of the

> additional weightbearing?

>

> Obesity linked to bad bones, study

>

> By staff reporter

> 11/27/2007- The list of health problems associated with obesity

> continues to grow, with a new study linking excess body fat with poor

> bone health.

>

> Published in the November issue of the American Journal of Clinical

> Nutrition, the new study found that the bones of people with high body

> fat were eight to nine percent weaker than those of normal body fat

> participants.

>

> Obesity has already been repeatedly linked to an increased risk of

> heart disease, stroke, diabetes, cancer, and a host of other health

> conditions.

>

> These growing health risks have already put significant pressure on

> the food industry for the role it plays in promoting unhealthy eating,

> pressure which is augmented by these latest findings.

>

> " Obesity is an epidemic in this country, and I think this study is

> critical because it highlights another potential negative health

> effect that people haven't considered, " said study co-author

> , professor of foods and nutrition at the University of Georgia

> College of Family and Consumer Sciences.

>

> and his team conducted advanced three-dimensional bone scans on

> 115 women aged 18 and 19 with normal (less than 32 percent) and high

> (greater than 32 percent) body fat.

>

> After adjusting for differences in muscle mass surrounding the bones,

> they found that overweight participants had less healthy bones.

>

> said the exact mechanisms by which excess fat hinders bone

> strength are unclear, but studies of obese rats show that they produce

> more fat cells in the bone marrow and fewer bone cells. Since fat and

> bone cells originate from the same precursor, it may be that fat cell

> production is favored over bone cell production in obese people.

>

> Childhood obesity could be particularly detrimental to bone health.

>

> " When you're young you have the capacity to change the shape of your

> bones, but when you get older you don't have that capacity. And

> because of that, childhood obesity could have a significant, long

> lasting negative impact on the skeleton, " said.

>

> Obesity is currently thought to affect more than 64 percent of the

> US's adult population and 16 percent of children.

>

> The condition, which has been repeatedly linked to increased risk for

> heart disease and diabetes, has been the bane of the food industry in

> recent years, with food firms often receiving much of the blame for

> the nation's increasing obesity rates.

>

>

>

> Is adiposity advantageous for bone strength? A peripheral quantitative

> computed tomography study in late adolescent females1,2,3

> Norman K Pollock, Emma M Laing, Clifton A Baile, Mark W Hamrick,

> B Hall and D

>

> 1 From the Departments of Foods and Nutrition (NKP, EML, CAB, and RDL)

> and Statistics (DBH), The University of Georgia, Athens, GA, and the

> Department of Cellular Biology and Anatomy, Medical College of

> Georgia, Augusta, GA (MWH)

>

> Background: Whereas excess adiposity is presumed to be advantageous

> for the skeleton, studies investigating relations between bone

> strength and fat during youth have been equivocal.

>

> Objectives: Relations of percentage body fat (BF) and bone strength

> indexes were assessed in late adolescent females, taking into

> consideration surrogates of muscle force [ie, muscle cross-sectional

> area (MCSA) and bone length]. Bone measurements in the normal- and

> high-fat groups were also compared.

>

> Design: Late adolescent females (n = 115; aged 18.2 ± 0.4 y)

> participated in this cross-sectional study. Fat-free soft tissue mass,

> fat mass, and percentage BF were measured with the use of dual-energy

> X-ray absorptiometry. Tibial and radial peripheral quantitative

> computed tomography measurements were taken at the 4% (trabecular

> bone), 20% (cortical bone), and 66% (for measurement of MCSA) sites

> from the distal metaphyses.

>

> Results: Percentage BF was inversely related to radial cortical bone

> area, total bone cross-sectional area (CSA), cortical bone mineral

> content (BMC), periosteal circumference, and strength-strain index

> (SSI) (20% site; all P < 0.05). After control for MCSA and limb

> length, negative relations remained between percentage BF and radial

> measurements and were also observed at the tibia (20% site).

> Unadjusted bone measures were not different between groups. After

> control for MCSA, the high- compared with the normal-fat group had

> lower bone measures at the 20% site (cortical bone area and cortical

> BMC at the tibia, total bone CSA at the radius, and SSI at both the

> tibia and radius; P < 0.05 for all).

>

> Conclusion: Excess weight in the form of fat mass does not provide

> additional benefits, and may potentially be negative, for adolescent

bone.

>