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Study: Even mid-life diet change can extend life



 
 
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  #1  
Old October 3rd, 2003, 07:11 AM
Steve Chaney, aka Papa Gunnykins ®
external usenet poster
 
Posts: n/a
Default Study: Even mid-life diet change can extend life

Study: Even mid-life diet change can extend life

WASHINGTON (AP) --It has long been known that laboratory animals live
longer on a low-calorie diet. Now a study suggests that even if sensible
eating is delayed until middle age, health can be improved and life
extended.

A study on diet and life in the journal Science dealt only with laboratory
fruit flies, but researchers said some of the same effects may apply to
mammals, perhaps even humans.

In the study, British researchers compared the effects of different
calorie-restricted diets on the mortality of fruit flies. They found that
fruit flies on restricted diets lived about 90 days, twice as long as those
fed on a normal diet.

But the scientists also found that when heavily fed fruit flies were
switched at middle age -- day 14 to 22 -- to leaner diets, then the animals
converted from the shorter life pattern of the overfed to the longer-lived
pattern of flies that had been on a restricted diet all their lives.

The carry-home message from the study, said Linda Partridge of University
College London is that it is never too late to improve health by switching
to sensible eating habits.

"If this works in humans, then it means that from the time a person starts
on a restricted diet, they'll be like individuals of the same age who were
always on that diet," she said. "Their prospects of survival are the same."

Partridge said that although the life-extending effects of short rations
have never been proven in humans, it has been shown in monkeys, mice, rats
and fruit flies that diet restrictions will lead to longer lives.

"There is no reason to suppose it wouldn't apply equally to humans," she
said. "There are diet restriction studies now underway with monkeys and all
the indications appear the same [as with mice, rats and fruit flies]."

James R. Carey, a University of California, Davis, researcher who studies
the biology of aging, said the Partridge study is "important to the field,"
but does not provide final answers about the true effects of restricted
diets.

He said that fruit flies and other animals on restricted diets tend to stop
reproducing. In mammals, for instance, the females stop ovulating and,
hence, cannot reproduce.

As a result, Carey said, animals on restricted diets may live longer simply
because they are not expending energy and stress in the rigors of
reproduction. He said studies still need to specifically isolate and prove
that it is the lean diet alone that leads to longer life, and not related
factors.


-- Steve
º¤º°`°º¤ø,¸¸,ø¤º°`°º¤º
Steve Chaney

Remove "Vegetus." to get my real email address
See the soc.singles HALL OF STUPID:
http://member.newsguy.com/~gunhed/hallofstupid
"If only sheep could cook, we wouldn't need women at all! 8)" - Dizzy,
Message-ID:
"Outside of this group, I don't remember hearing anyone in RL say that fat
people are worthless." - some anonymous coward admitting the truth,
Message-ID:
"I watched The Accused last night with Jodie Foster. Tough movie. I was
wondering what people felt as to whether or not they feel she deserved what
happened to her." - Brenda Lee Ehmka, Message-ID:

"Jade, your whole existence is spent trying to find people you can justify
vetting your rage toward thorugh all forms of harassment. Do you realize
that?" - Sunny, on Jade's life in a nutshell





  #2  
Old October 3rd, 2003, 02:20 PM
Jenny
external usenet poster
 
Posts: n/a
Default Study: Even mid-life diet change can extend life

My dad is heading towards his 99th birthday still living independently at
home. He's been restricting calories, fat, salt, and sugar since the early
1960s. He walked 3 miles every day but that was all the exercise he took.
He only retired from his profession in his 90s when his vision started to
fail.

All his many siblings died of heart disease in their 60s and 70s.

Dietary restriction worked very well for him. OTOH, living on a diet of
Special K, skim milk, cottage cheese, yogurt, and a tiny serving of meat and
frozen veg day in and day out for fifty years isn't for everyone. Certainly
not me!

-- Jenny

168.5/137

Low Carb 9/1998 - 8/2001 and 11/10/02 - Now

http://www.geocities.com/jenny_the_bean
How to calculate your need for protein * How much people really lose each
month * Water Weight Gain & Loss * The "Two Gram Cure" for Hunger Cravings
* Characteristics of Successful Dieters * Indispensible Low Carb Treats *
Should You Count that Low Impact Carb? * Curing Ketobreath * Exercise
Starting from Zero * NEW! Do Starch Blockers Work?


"Steve Chaney, aka Papa Gunnykins ®" wrote in
message ...
Study: Even mid-life diet change can extend life

WASHINGTON (AP) --It has long been known that laboratory animals live
longer on a low-calorie diet. Now a study suggests that even if sensible
eating is delayed until middle age, health can be improved and life
extended.

A study on diet and life in the journal Science dealt only with laboratory
fruit flies, but researchers said some of the same effects may apply to
mammals, perhaps even humans.

In the study, British researchers compared the effects of different
calorie-restricted diets on the mortality of fruit flies. They found that
fruit flies on restricted diets lived about 90 days, twice as long as

those
fed on a normal diet.

But the scientists also found that when heavily fed fruit flies were
switched at middle age -- day 14 to 22 -- to leaner diets, then the

animals
converted from the shorter life pattern of the overfed to the longer-lived
pattern of flies that had been on a restricted diet all their lives.

The carry-home message from the study, said Linda Partridge of University
College London is that it is never too late to improve health by switching
to sensible eating habits.

"If this works in humans, then it means that from the time a person starts
on a restricted diet, they'll be like individuals of the same age who were
always on that diet," she said. "Their prospects of survival are the

same."

Partridge said that although the life-extending effects of short rations
have never been proven in humans, it has been shown in monkeys, mice, rats
and fruit flies that diet restrictions will lead to longer lives.

"There is no reason to suppose it wouldn't apply equally to humans," she
said. "There are diet restriction studies now underway with monkeys and

all
the indications appear the same [as with mice, rats and fruit flies]."

James R. Carey, a University of California, Davis, researcher who studies
the biology of aging, said the Partridge study is "important to the

field,"
but does not provide final answers about the true effects of restricted
diets.

He said that fruit flies and other animals on restricted diets tend to

stop
reproducing. In mammals, for instance, the females stop ovulating and,
hence, cannot reproduce.

As a result, Carey said, animals on restricted diets may live longer

simply
because they are not expending energy and stress in the rigors of
reproduction. He said studies still need to specifically isolate and prove
that it is the lean diet alone that leads to longer life, and not related
factors.


-- Steve
º¤º°`°º¤ø,¸¸,ø¤º°`°º¤º
Steve Chaney

Remove "Vegetus." to get my real email address
See the soc.singles HALL OF STUPID:
http://member.newsguy.com/~gunhed/hallofstupid
"If only sheep could cook, we wouldn't need women at all! 8)" - Dizzy,
Message-ID:
"Outside of this group, I don't remember hearing anyone in RL say that fat
people are worthless." - some anonymous coward admitting the truth,
Message-ID:
"I watched The Accused last night with Jodie Foster. Tough movie. I was
wondering what people felt as to whether or not they feel she deserved

what
happened to her." - Brenda Lee Ehmka, Message-ID:

"Jade, your whole existence is spent trying to find people you can justify
vetting your rage toward thorugh all forms of harassment. Do you realize
that?" - Sunny, on Jade's life in a nutshell







  #3  
Old October 3rd, 2003, 08:24 PM
The Danimal
external usenet poster
 
Posts: n/a
Default Study: Even mid-life diet change can extend life

(Steve Chaney, aka Papa Gunnykins ®) wrote in message ...
Study: Even mid-life diet change can extend life

WASHINGTON (AP) --It has long been known that laboratory animals live
longer on a low-calorie diet. Now a study suggests that even if sensible
eating is delayed until middle age, health can be improved and life
extended.

[...]
The carry-home message from the study, said Linda Partridge of University
College London is that it is never too late to improve health by switching
to sensible eating habits.


Another carry-home message from the study is that if you want
to restrict the food intake of a living animal to such a degree,
you first have to restrict that animal to a cage.

"If this works in humans, then it means that from the time a person starts
on a restricted diet, they'll be like individuals of the same age who were
always on that diet," she said. "Their prospects of survival are the same."


Most humans do not live in cages. Therefore the studies on caged
animals fail to control for one obvious variable which differs
for people.

Maybe the effect of dietary restriction is different for captive
animals, somehow.

It would be extremely difficult to regulate the food intake of
free-ranging animals. I wonder if anybody has tried?

Partridge said that although the life-extending effects of short rations
have never been proven in humans,


And the question is why not? I've been reading about the
life-extending effects of short rations in caged animals
about as far back as I can remember. I remember hearing
about this when I was in college, and at the time I already
knew it was old news.

Enough decades have passed since the calorie-restricted
diet news broke for someone to have tested the diet in humans.

One problem is that according to Scientific American magazine, fewer
than 1 in 1000 people have the self-control necessary to remain on
the diet voluntarily. Evidently zero out of 1000 animals have such
self-control, which is why you have to cage animals before you can
get them to undereat to this degree.

it has been shown in monkeys, mice, rats
and fruit flies that diet restrictions will lead to longer lives.


The cosmetic effects of such a diet are interesting. Check out
the photo of Michael Cooper in this article:

http://www.sciam.com/article.cfm?art...88EF21&catID=2

Few women would find such a chronically underfed man ideally
attractive, which just goes to show SEXUAL ATTRACTION IS NOT
SOLELY ABOUT DESIRING MAXIMALLY HEALTHY PARTNERS.

Of course if we believe the claims of fat acceptors, many of them
would become even more obese on this diet.

"There is no reason to suppose it wouldn't apply equally to humans,"


Actually there is. Some of these experiments show a doubling of
the MAXIMUM lifespan for a particular species. In humans that
would correspond to living more than 200 years. There are probably
reasons to suppose humans cannot live to 200 years solely by
restricting their calorie intake.

she
said. "There are diet restriction studies now underway with monkeys and all
the indications appear the same [as with mice, rats and fruit flies]."


All the indications are that no uncaged animal will voluntarily
stay on such a diet for long.

The degree of calorie restriction on this diet is about what would
result in the diagnosis of an eating disorder.

James R. Carey, a University of California, Davis, researcher who studies
the biology of aging, said the Partridge study is "important to the field,"
but does not provide final answers about the true effects of restricted
diets.

He said that fruit flies and other animals on restricted diets tend to stop
reproducing. In mammals, for instance, the females stop ovulating and,
hence, cannot reproduce.

As a result, Carey said, animals on restricted diets may live longer simply
because they are not expending energy and stress in the rigors of
reproduction.


I wonder what Carey means by "simply." The molecular mechanisms
he's lumping into the word "stress" are so complicated that nobody
has explained them all yet.

Being locked in a cage and fed less than you want is probably
pretty stressful, too.

Most prisoners of war who have had that experience never want to
feel hungry again.

He said studies still need to specifically isolate and prove
that it is the lean diet alone that leads to longer life, and not related
factors.


Someone needs to explain in mechanistic detail (that is, down
to the molecular level) exactly what aging is. We can see some
of the large-scale indications of aging, but until someone can
explain all the molecular rearrangements that cause the large-scale
effects it will be hard to know what the experiments are showing.

-- the Danimal
  #4  
Old October 3rd, 2003, 08:48 PM
Jenny
external usenet poster
 
Posts: n/a
Default Study: Even mid-life diet change can extend life

Well, for starters, watching my dad outlive all their friends and his eyes
and ears has not motivated me to want to live to be quite that old.

Plus, unlike my dad, I enjoy food enough that I'm not willing to basically
give it up for fifty years.

That said, I have been getting by this past year on a diet that is only
about 2/3s of what the nutritionists seem to think should be maintenance and
I have no plans to up my calories ever.

-- Jenny

168.5/137

Low Carb 9/1998 - 8/2001 and 11/10/02 - Now

http://www.geocities.com/jenny_the_bean
How to calculate your need for protein * How much people really lose each
month * Water Weight Gain & Loss * The "Two Gram Cure" for Hunger Cravings
* Characteristics of Successful Dieters * Indispensible Low Carb Treats *
Should You Count that Low Impact Carb? * Curing Ketobreath * Exercise
Starting from Zero * NEW! Do Starch Blockers Work?


"Ignoramus21054" wrote in message
...
In article , Jenny wrote:
My dad is heading towards his 99th birthday still living independently

at
home. He's been restricting calories, fat, salt, and sugar since the

early
1960s. He walked 3 miles every day but that was all the exercise he

took.
He only retired from his profession in his 90s when his vision started

to
fail.

All his many siblings died of heart disease in their 60s and 70s.

Dietary restriction worked very well for him. OTOH, living on a diet of
Special K, skim milk, cottage cheese, yogurt, and a tiny serving of meat

and
frozen veg day in and day out for fifty years isn't for everyone.

Certainly
not me!


Amazing stuff. I cannot help but note that your dad's diet has nothing
to do with the diet that you follow!!!

i

168.5/137

Low Carb 9/1998 - 8/2001 and 11/10/02 - Now

http://www.geocities.com/jenny_the_bean
How to calculate your need for protein * How much people really lose

each
month * Water Weight Gain & Loss * The "Two Gram Cure" for Hunger

Cravings
* Characteristics of Successful Dieters * Indispensible Low Carb Treats

*
Should You Count that Low Impact Carb? * Curing Ketobreath * Exercise
Starting from Zero * NEW! Do Starch Blockers Work?


"Steve Chaney, aka Papa Gunnykins ®"

wrote in
message ...
Study: Even mid-life diet change can extend life

WASHINGTON (AP) --It has long been known that laboratory animals live
longer on a low-calorie diet. Now a study suggests that even if

sensible
eating is delayed until middle age, health can be improved and life
extended.

A study on diet and life in the journal Science dealt only with

laboratory
fruit flies, but researchers said some of the same effects may apply to
mammals, perhaps even humans.

In the study, British researchers compared the effects of different
calorie-restricted diets on the mortality of fruit flies. They found

that
fruit flies on restricted diets lived about 90 days, twice as long as

those
fed on a normal diet.

But the scientists also found that when heavily fed fruit flies were
switched at middle age -- day 14 to 22 -- to leaner diets, then the

animals
converted from the shorter life pattern of the overfed to the

longer-lived
pattern of flies that had been on a restricted diet all their lives.

The carry-home message from the study, said Linda Partridge of

University
College London is that it is never too late to improve health by

switching
to sensible eating habits.

"If this works in humans, then it means that from the time a person

starts
on a restricted diet, they'll be like individuals of the same age who

were
always on that diet," she said. "Their prospects of survival are the

same."

Partridge said that although the life-extending effects of short

rations
have never been proven in humans, it has been shown in monkeys, mice,

rats
and fruit flies that diet restrictions will lead to longer lives.

"There is no reason to suppose it wouldn't apply equally to humans,"

she
said. "There are diet restriction studies now underway with monkeys and

all
the indications appear the same [as with mice, rats and fruit flies]."

James R. Carey, a University of California, Davis, researcher who

studies
the biology of aging, said the Partridge study is "important to the

field,"
but does not provide final answers about the true effects of restricted
diets.

He said that fruit flies and other animals on restricted diets tend to

stop
reproducing. In mammals, for instance, the females stop ovulating and,
hence, cannot reproduce.

As a result, Carey said, animals on restricted diets may live longer

simply
because they are not expending energy and stress in the rigors of
reproduction. He said studies still need to specifically isolate and

prove
that it is the lean diet alone that leads to longer life, and not

related
factors.


º¤º°`°º¤ø,¸¸,ø¤º°`°º¤º
Steve Chaney

Remove "Vegetus." to get my real email address
See the soc.singles HALL OF STUPID:
http://member.newsguy.com/~gunhed/hallofstupid
"If only sheep could cook, we wouldn't need women at all! 8)" -

Dizzy,
Message-ID:
"Outside of this group, I don't remember hearing anyone in RL say that

fat
people are worthless." - some anonymous coward admitting the truth,
Message-ID:
"I watched The Accused last night with Jodie Foster. Tough movie. I was
wondering what people felt as to whether or not they feel she deserved

what
happened to her." - Brenda Lee Ehmka, Message-ID:

"Jade, your whole existence is spent trying to find people you can

justify
vetting your rage toward thorugh all forms of harassment. Do you

realize
that?" - Sunny, on Jade's life in a nutshell









  #5  
Old October 3rd, 2003, 09:10 PM
Lesanne
external usenet poster
 
Posts: n/a
Default Study: Even mid-life diet change can extend life


The cosmetic effects of such a diet are interesting. Check out
the photo of Michael Cooper in this article:


http://www.sciam.com/article.cfm?art...9B81809EC588EF
21&catID=2

Few women would find such a chronically underfed man ideally
attractive, which just goes to show SEXUAL ATTRACTION IS NOT
SOLELY ABOUT DESIRING MAXIMALLY HEALTHY PARTNERS.


Never mind, probably impotent anyway, certainly wouldn't have much
stamina.....


 




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