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Re: *Reverse T3-OM

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This explains SOOOooo much. I have been under herrendous stress from mercury

illness and some other things to boot.

My question is, under the circumstances, I do not see a reason to take T4 at

all. It seems to me that taking T3 only would be a better approach for me. I

looked at the site for WILSON'S T3 and it makes sense for everything except

that I can not afford to try it.

~Inga

on 2/20/05 4:14 PM, *~ OM ~* at OM@... wrote:

>

>

>

> MORE THYROID INFORMATION

>

> http://drguberman.com/news.cfm?date_range=8/01/04

>

> Armour and Thyrolar both contain 38 mcg of T4 and 9 mcg of T3. This is 4

> parts T4 to 1 part T3 (the exact ratio is 4.22 to 1). Some endocrinologists

> now advocate the use of products containing both T4 and T3, but they

> recommend a higher T4 to T3 ratio. They prefer a ratio 10 parts T4 to 1 part

> T3. The lower T3 content of such products renders them far less effective

> than Armour and Thyrolar. In our clinical experience, the treatment outcome

> is inferior for patients who use products with the lower T3 content. The

> inferior treatment outcome is supported by two recent studies conducted by

> endocrinologists.[1][2] The studies showed that patients who added only a

> small amount of T3 to their T4 continued to suffer from symptoms, just as

> did patients who used T4 alone. The ratios of T4 to T3 the patients used

> varied, but most used a higher T4 to T3 ration than in Armour and Thyrolar.

> Of course, the endocrinologists restricted the patients' dosages according

> to their TSH and thyroid hormone levels, and this almost guaranteed that the

> patients took too little thyroid hormone and continued to suffer from

> hypothyroid symptoms. If a new dose of Armour contains too little T4 and T3

> to benefit you, you’ll have to go through another evaluation period. And

> you’ll have to do this again and again until you find what I call your

> therapeutic window " —a small dosage range that optimally benefits you without

> overstimulating you. That optimal dosage range is highly individual, but

> historically, the typical patient’s therapeutic window has been somewhere

> between 120 to 240 mg (2 to 4 grains). There’s no way to accurately predict

> what your therapeutic window is. Until you find it, you may not improve much

> from the Armour. But once you do, you’re likely to feel that the wait was

> well worth it.

>

> The thyroid gland secretes mostly T4 and very little T3. Most of the T3 that

> drives cell metabolism is produced by action of the enzyme named 5

> -deiodinase, which converts T4 to T3. (We pronounce the " 5'- " as " five-prime

> " ) Without this conversion of T4 to T3, cells have too little T3 to maintain

> normal metabolism; metabolism then slows down. T3, therefore, is the

> metabolically active thyroid hormone. For the most part, T4 is metabolically

> inactive. T4 " drives " metabolism only after the deiodinase enzyme converts

> it to T3.

>

> Another enzyme called 5-deiodinase continually converts some T4 to

> reverse-T3. Reverse-T3 does not stimulate metabolism. It is produced as a

> way to help clear some T4 from the body.

>

> Under normal conditions, cells continually convert about 40% of T4 to T3.

> They convert about 60% of T4 to reverse-T3. Hour-by-hour, conversion of T4

> continues with slight shifts in the percentage of T4 converted to T3 and

> reverse-T3. Under normal conditions, the body eliminates reverse-T3 rapidly.

> Other enzymes quickly convert reverse-T3 to T2 and T2 to T1, and the body

> eliminates these molecules within roughly 24-hours. (The process of

> deiodination in the body is a bit more complicated than I can explain in

> this short summary.) The point is that the process of deiodination is

> dynamic and constantly changing, depending on the body's needs.

>

> Under certain conditions, the conversion of T4 to T3 decreases, and more

> reverse T3 is produced from T4. Three of these conditions are food

> deprivation (as during fasting or starvation), illness (such as liver

> disease), and stresses that increase the blood level of the stress hormone

> called cortisol. We assume that reduced conversion of T4 to T3 under such

> conditions slows metabolism and aids survival.

>

> Thus, during fasting, disease, or stress, the conversion of T4 to reverse-T3

> increases. At these times, conversion of T4 to T3 decreases about 50%, and

> conversion of T4 to reverse-T3 increases about 50%. Under normal,

> non-stressful conditions, different enzymes convert some T4 to T3 and some

> to reverse-T3. The same is true during fasting, illness, or stress; only the

> percentages change--less T4 is converted to T3 and more is converted to

> reverse-T3.

>

> The reduced T3 level that occurs during illness, fasting, or stress slows

> the metabolism of many tissues. Because of the slowed metabolism, the body

> does not eliminate reverse-T3 as rapidly as usual. The slowed elimination

> from the body allows the reverse-T3 level in the blood to increase

> considerably.

>

> In addition, during stressful experiences such as surgery and combat, the

> amount of the stress hormone cortisol increases. The increase inhibits

> conversion of T4 to T3; conversion of T4 to reverse-T3 increases. The same

> inhibition occurs when a patient has Cushing's syndrome, a disease in which

> the adrenal glands produce too much cortisol. Inhibition also occurs when a

> patient begins taking cortisol as a medication such as prednisone. However,

> whether the increased circulating cortisol occurs from stress, Cushing's

> syndrome, or taking prednisone, the inhibition of T4 to T3 conversion is

> temporary. It seldom lasts for more than one-to-three weeks, even if the

> circulating cortisol level continues to be high. Studies have documented

> that the inhibition is temporary.

>

> A popular belief nowadays (proposed by Dr. Dennis ) has not been proven

> to be true, and much scientific evidence tips the scales in the " false "

> direction with regard to this idea. The belief is that the process involving

> impaired T4 to T3 conversion--with increases in reverse-T3--becomes stuck. The

> " stuck " conversion is supposed to cause chronic low T3 levels and chronically

> slowed metabolism. Some have speculated that the elevated reverse-T3 is the

> culprit, continually blocking the conversion of T4 to T3 as a competitive

> substrate for the 5’-deiodinase enzyme. However, this belief is contradicted

> by studies of the dynamics of T4 to T3 conversion and T4 to reverse-T3

> conversion. Laboratory studies have shown that when factors such as increased

> cortisol levels cause a decrease in T4 to T3 conversion and an increase in T4

> to reverse-T3 conversion, the shift in the percentages of T3 and reverse-T3

> produced is only temporary.

>

>

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Guest guest

Since I have 300 messages to go through this has probably been answered,

but . . . his is prepared by a compounding pharmacy and is timed release.

*********** REPLY SEPARATOR ***********

what is the difference in 's T3 and just ordering T3 ?

SandyE~Houston

Re: *Reverse T3-OM

This explains SOOOooo much. I have been under herrendous stress from

mercury

illness and some other things to boot.

My question is, under the circumstances, I do not see a reason to take T4

at

all. It seems to me that taking T3 only would be a better approach for

me. I

looked at the site for WILSON'S T3 and it makes sense for everything

except

that I can not afford to try it.

~Inga

on 2/20/05 4:14 PM, *~ OM ~* at OM@... wrote:

>

>

>

> MORE THYROID INFORMATION

>

> http://drguberman.com/news.cfm?date_range=8/01/04

>

> Armour and Thyrolar both contain 38 mcg of T4 and 9 mcg of T3. This is

4

> parts T4 to 1 part T3 (the exact ratio is 4.22 to 1). Some

endocrinologists

> now advocate the use of products containing both T4 and T3, but they

> recommend a higher T4 to T3 ratio. They prefer a ratio 10 parts T4 to 1

part

> T3. The lower T3 content of such products renders them far less

effective

> than Armour and Thyrolar. In our clinical experience, the treatment

outcome

> is inferior for patients who use products with the lower T3 content.

The

> inferior treatment outcome is supported by two recent studies conducted

by

> endocrinologists.[1][2] The studies showed that patients who added only

a

> small amount of T3 to their T4 continued to suffer from symptoms, just

as

> did patients who used T4 alone. The ratios of T4 to T3 the patients

used

> varied, but most used a higher T4 to T3 ration than in Armour and

Thyrolar.

> Of course, the endocrinologists restricted the patients' dosages

according

> to their TSH and thyroid hormone levels, and this almost guaranteed

that the

> patients took too little thyroid hormone and continued to suffer from

> hypothyroid symptoms. If a new dose of Armour contains too little T4

and T3

> to benefit you, you'll have to go through another evaluation period.

And

> you'll have to do this again and again until you find what I call your

> therapeutic window " -a small dosage range that optimally benefits you

without

> overstimulating you. That optimal dosage range is highly individual,

but

> historically, the typical patient's therapeutic window has been

somewhere

> between 120 to 240 mg (2 to 4 grains). There's no way to accurately

predict

> what your therapeutic window is. Until you find it, you may not improve

much

> from the Armour. But once you do, you're likely to feel that the wait

was

> well worth it.

>

> The thyroid gland secretes mostly T4 and very little T3. Most of the T3

that

> drives cell metabolism is produced by action of the enzyme named 5

> -deiodinase, which converts T4 to T3. (We pronounce the " 5'- " as

" five-prime

> " ) Without this conversion of T4 to T3, cells have too little T3 to

maintain

> normal metabolism; metabolism then slows down. T3, therefore, is the

> metabolically active thyroid hormone. For the most part, T4 is

metabolically

> inactive. T4 " drives " metabolism only after the deiodinase enzyme

converts

> it to T3.

>

> Another enzyme called 5-deiodinase continually converts some T4 to

> reverse-T3. Reverse-T3 does not stimulate metabolism. It is produced as

a

> way to help clear some T4 from the body.

>

> Under normal conditions, cells continually convert about 40% of T4 to

T3.

> They convert about 60% of T4 to reverse-T3. Hour-by-hour, conversion of

T4

> continues with slight shifts in the percentage of T4 converted to T3

and

> reverse-T3. Under normal conditions, the body eliminates reverse-T3

rapidly.

> Other enzymes quickly convert reverse-T3 to T2 and T2 to T1, and the

body

> eliminates these molecules within roughly 24-hours. (The process of

> deiodination in the body is a bit more complicated than I can explain

in

> this short summary.) The point is that the process of deiodination is

> dynamic and constantly changing, depending on the body's needs.

>

> Under certain conditions, the conversion of T4 to T3 decreases, and

more

> reverse T3 is produced from T4. Three of these conditions are food

> deprivation (as during fasting or starvation), illness (such as liver

> disease), and stresses that increase the blood level of the stress

hormone

> called cortisol. We assume that reduced conversion of T4 to T3 under

such

> conditions slows metabolism and aids survival.

>

> Thus, during fasting, disease, or stress, the conversion of T4 to

reverse-T3

> increases. At these times, conversion of T4 to T3 decreases about 50%,

and

> conversion of T4 to reverse-T3 increases about 50%. Under normal,

> non-stressful conditions, different enzymes convert some T4 to T3 and

some

> to reverse-T3. The same is true during fasting, illness, or stress;

only the

> percentages change--less T4 is converted to T3 and more is converted to

> reverse-T3.

>

> The reduced T3 level that occurs during illness, fasting, or stress

slows

> the metabolism of many tissues. Because of the slowed metabolism, the

body

> does not eliminate reverse-T3 as rapidly as usual. The slowed

elimination

> from the body allows the reverse-T3 level in the blood to increase

> considerably.

>

> In addition, during stressful experiences such as surgery and combat,

the

> amount of the stress hormone cortisol increases. The increase inhibits

> conversion of T4 to T3; conversion of T4 to reverse-T3 increases. The

same

> inhibition occurs when a patient has Cushing's syndrome, a disease in

which

> the adrenal glands produce too much cortisol. Inhibition also occurs

when a

> patient begins taking cortisol as a medication such as prednisone.

However,

> whether the increased circulating cortisol occurs from stress,

Cushing's

> syndrome, or taking prednisone, the inhibition of T4 to T3 conversion

is

> temporary. It seldom lasts for more than one-to-three weeks, even if

the

> circulating cortisol level continues to be high. Studies have

documented

> that the inhibition is temporary.

>

> A popular belief nowadays (proposed by Dr. Dennis ) has not been

proven

> to be true, and much scientific evidence tips the scales in the " false "

> direction with regard to this idea. The belief is that the process

involving

> impaired T4 to T3 conversion--with increases in reverse-T3--becomes

stuck. The

> " stuck " conversion is supposed to cause chronic low T3 levels and

chronically

> slowed metabolism. Some have speculated that the elevated reverse-T3 is

the

> culprit, continually blocking the conversion of T4 to T3 as a

competitive

> substrate for the 5'-deiodinase enzyme. However, this belief is

contradicted

> by studies of the dynamics of T4 to T3 conversion and T4 to reverse-T3

> conversion. Laboratory studies have shown that when factors such as

increased

> cortisol levels cause a decrease in T4 to T3 conversion and an increase

in T4

> to reverse-T3 conversion, the shift in the percentages of T3 and

reverse-T3

> produced is only temporary.

>

>

Link to comment
Share on other sites

Guest guest

Since I have 300 messages to go through this has probably been answered,

but . . . his is prepared by a compounding pharmacy and is timed release.

*********** REPLY SEPARATOR ***********

what is the difference in 's T3 and just ordering T3 ?

SandyE~Houston

Re: *Reverse T3-OM

This explains SOOOooo much. I have been under herrendous stress from

mercury

illness and some other things to boot.

My question is, under the circumstances, I do not see a reason to take T4

at

all. It seems to me that taking T3 only would be a better approach for

me. I

looked at the site for WILSON'S T3 and it makes sense for everything

except

that I can not afford to try it.

~Inga

on 2/20/05 4:14 PM, *~ OM ~* at OM@... wrote:

>

>

>

> MORE THYROID INFORMATION

>

> http://drguberman.com/news.cfm?date_range=8/01/04

>

> Armour and Thyrolar both contain 38 mcg of T4 and 9 mcg of T3. This is

4

> parts T4 to 1 part T3 (the exact ratio is 4.22 to 1). Some

endocrinologists

> now advocate the use of products containing both T4 and T3, but they

> recommend a higher T4 to T3 ratio. They prefer a ratio 10 parts T4 to 1

part

> T3. The lower T3 content of such products renders them far less

effective

> than Armour and Thyrolar. In our clinical experience, the treatment

outcome

> is inferior for patients who use products with the lower T3 content.

The

> inferior treatment outcome is supported by two recent studies conducted

by

> endocrinologists.[1][2] The studies showed that patients who added only

a

> small amount of T3 to their T4 continued to suffer from symptoms, just

as

> did patients who used T4 alone. The ratios of T4 to T3 the patients

used

> varied, but most used a higher T4 to T3 ration than in Armour and

Thyrolar.

> Of course, the endocrinologists restricted the patients' dosages

according

> to their TSH and thyroid hormone levels, and this almost guaranteed

that the

> patients took too little thyroid hormone and continued to suffer from

> hypothyroid symptoms. If a new dose of Armour contains too little T4

and T3

> to benefit you, you'll have to go through another evaluation period.

And

> you'll have to do this again and again until you find what I call your

> therapeutic window " -a small dosage range that optimally benefits you

without

> overstimulating you. That optimal dosage range is highly individual,

but

> historically, the typical patient's therapeutic window has been

somewhere

> between 120 to 240 mg (2 to 4 grains). There's no way to accurately

predict

> what your therapeutic window is. Until you find it, you may not improve

much

> from the Armour. But once you do, you're likely to feel that the wait

was

> well worth it.

>

> The thyroid gland secretes mostly T4 and very little T3. Most of the T3

that

> drives cell metabolism is produced by action of the enzyme named 5

> -deiodinase, which converts T4 to T3. (We pronounce the " 5'- " as

" five-prime

> " ) Without this conversion of T4 to T3, cells have too little T3 to

maintain

> normal metabolism; metabolism then slows down. T3, therefore, is the

> metabolically active thyroid hormone. For the most part, T4 is

metabolically

> inactive. T4 " drives " metabolism only after the deiodinase enzyme

converts

> it to T3.

>

> Another enzyme called 5-deiodinase continually converts some T4 to

> reverse-T3. Reverse-T3 does not stimulate metabolism. It is produced as

a

> way to help clear some T4 from the body.

>

> Under normal conditions, cells continually convert about 40% of T4 to

T3.

> They convert about 60% of T4 to reverse-T3. Hour-by-hour, conversion of

T4

> continues with slight shifts in the percentage of T4 converted to T3

and

> reverse-T3. Under normal conditions, the body eliminates reverse-T3

rapidly.

> Other enzymes quickly convert reverse-T3 to T2 and T2 to T1, and the

body

> eliminates these molecules within roughly 24-hours. (The process of

> deiodination in the body is a bit more complicated than I can explain

in

> this short summary.) The point is that the process of deiodination is

> dynamic and constantly changing, depending on the body's needs.

>

> Under certain conditions, the conversion of T4 to T3 decreases, and

more

> reverse T3 is produced from T4. Three of these conditions are food

> deprivation (as during fasting or starvation), illness (such as liver

> disease), and stresses that increase the blood level of the stress

hormone

> called cortisol. We assume that reduced conversion of T4 to T3 under

such

> conditions slows metabolism and aids survival.

>

> Thus, during fasting, disease, or stress, the conversion of T4 to

reverse-T3

> increases. At these times, conversion of T4 to T3 decreases about 50%,

and

> conversion of T4 to reverse-T3 increases about 50%. Under normal,

> non-stressful conditions, different enzymes convert some T4 to T3 and

some

> to reverse-T3. The same is true during fasting, illness, or stress;

only the

> percentages change--less T4 is converted to T3 and more is converted to

> reverse-T3.

>

> The reduced T3 level that occurs during illness, fasting, or stress

slows

> the metabolism of many tissues. Because of the slowed metabolism, the

body

> does not eliminate reverse-T3 as rapidly as usual. The slowed

elimination

> from the body allows the reverse-T3 level in the blood to increase

> considerably.

>

> In addition, during stressful experiences such as surgery and combat,

the

> amount of the stress hormone cortisol increases. The increase inhibits

> conversion of T4 to T3; conversion of T4 to reverse-T3 increases. The

same

> inhibition occurs when a patient has Cushing's syndrome, a disease in

which

> the adrenal glands produce too much cortisol. Inhibition also occurs

when a

> patient begins taking cortisol as a medication such as prednisone.

However,

> whether the increased circulating cortisol occurs from stress,

Cushing's

> syndrome, or taking prednisone, the inhibition of T4 to T3 conversion

is

> temporary. It seldom lasts for more than one-to-three weeks, even if

the

> circulating cortisol level continues to be high. Studies have

documented

> that the inhibition is temporary.

>

> A popular belief nowadays (proposed by Dr. Dennis ) has not been

proven

> to be true, and much scientific evidence tips the scales in the " false "

> direction with regard to this idea. The belief is that the process

involving

> impaired T4 to T3 conversion--with increases in reverse-T3--becomes

stuck. The

> " stuck " conversion is supposed to cause chronic low T3 levels and

chronically

> slowed metabolism. Some have speculated that the elevated reverse-T3 is

the

> culprit, continually blocking the conversion of T4 to T3 as a

competitive

> substrate for the 5'-deiodinase enzyme. However, this belief is

contradicted

> by studies of the dynamics of T4 to T3 conversion and T4 to reverse-T3

> conversion. Laboratory studies have shown that when factors such as

increased

> cortisol levels cause a decrease in T4 to T3 conversion and an increase

in T4

> to reverse-T3 conversion, the shift in the percentages of T3 and

reverse-T3

> produced is only temporary.

>

>

Link to comment
Share on other sites

Guest guest

Since I have 300 messages to go through this has probably been answered,

but . . . his is prepared by a compounding pharmacy and is timed release.

*********** REPLY SEPARATOR ***********

what is the difference in 's T3 and just ordering T3 ?

SandyE~Houston

Re: *Reverse T3-OM

This explains SOOOooo much. I have been under herrendous stress from

mercury

illness and some other things to boot.

My question is, under the circumstances, I do not see a reason to take T4

at

all. It seems to me that taking T3 only would be a better approach for

me. I

looked at the site for WILSON'S T3 and it makes sense for everything

except

that I can not afford to try it.

~Inga

on 2/20/05 4:14 PM, *~ OM ~* at OM@... wrote:

>

>

>

> MORE THYROID INFORMATION

>

> http://drguberman.com/news.cfm?date_range=8/01/04

>

> Armour and Thyrolar both contain 38 mcg of T4 and 9 mcg of T3. This is

4

> parts T4 to 1 part T3 (the exact ratio is 4.22 to 1). Some

endocrinologists

> now advocate the use of products containing both T4 and T3, but they

> recommend a higher T4 to T3 ratio. They prefer a ratio 10 parts T4 to 1

part

> T3. The lower T3 content of such products renders them far less

effective

> than Armour and Thyrolar. In our clinical experience, the treatment

outcome

> is inferior for patients who use products with the lower T3 content.

The

> inferior treatment outcome is supported by two recent studies conducted

by

> endocrinologists.[1][2] The studies showed that patients who added only

a

> small amount of T3 to their T4 continued to suffer from symptoms, just

as

> did patients who used T4 alone. The ratios of T4 to T3 the patients

used

> varied, but most used a higher T4 to T3 ration than in Armour and

Thyrolar.

> Of course, the endocrinologists restricted the patients' dosages

according

> to their TSH and thyroid hormone levels, and this almost guaranteed

that the

> patients took too little thyroid hormone and continued to suffer from

> hypothyroid symptoms. If a new dose of Armour contains too little T4

and T3

> to benefit you, you'll have to go through another evaluation period.

And

> you'll have to do this again and again until you find what I call your

> therapeutic window " -a small dosage range that optimally benefits you

without

> overstimulating you. That optimal dosage range is highly individual,

but

> historically, the typical patient's therapeutic window has been

somewhere

> between 120 to 240 mg (2 to 4 grains). There's no way to accurately

predict

> what your therapeutic window is. Until you find it, you may not improve

much

> from the Armour. But once you do, you're likely to feel that the wait

was

> well worth it.

>

> The thyroid gland secretes mostly T4 and very little T3. Most of the T3

that

> drives cell metabolism is produced by action of the enzyme named 5

> -deiodinase, which converts T4 to T3. (We pronounce the " 5'- " as

" five-prime

> " ) Without this conversion of T4 to T3, cells have too little T3 to

maintain

> normal metabolism; metabolism then slows down. T3, therefore, is the

> metabolically active thyroid hormone. For the most part, T4 is

metabolically

> inactive. T4 " drives " metabolism only after the deiodinase enzyme

converts

> it to T3.

>

> Another enzyme called 5-deiodinase continually converts some T4 to

> reverse-T3. Reverse-T3 does not stimulate metabolism. It is produced as

a

> way to help clear some T4 from the body.

>

> Under normal conditions, cells continually convert about 40% of T4 to

T3.

> They convert about 60% of T4 to reverse-T3. Hour-by-hour, conversion of

T4

> continues with slight shifts in the percentage of T4 converted to T3

and

> reverse-T3. Under normal conditions, the body eliminates reverse-T3

rapidly.

> Other enzymes quickly convert reverse-T3 to T2 and T2 to T1, and the

body

> eliminates these molecules within roughly 24-hours. (The process of

> deiodination in the body is a bit more complicated than I can explain

in

> this short summary.) The point is that the process of deiodination is

> dynamic and constantly changing, depending on the body's needs.

>

> Under certain conditions, the conversion of T4 to T3 decreases, and

more

> reverse T3 is produced from T4. Three of these conditions are food

> deprivation (as during fasting or starvation), illness (such as liver

> disease), and stresses that increase the blood level of the stress

hormone

> called cortisol. We assume that reduced conversion of T4 to T3 under

such

> conditions slows metabolism and aids survival.

>

> Thus, during fasting, disease, or stress, the conversion of T4 to

reverse-T3

> increases. At these times, conversion of T4 to T3 decreases about 50%,

and

> conversion of T4 to reverse-T3 increases about 50%. Under normal,

> non-stressful conditions, different enzymes convert some T4 to T3 and

some

> to reverse-T3. The same is true during fasting, illness, or stress;

only the

> percentages change--less T4 is converted to T3 and more is converted to

> reverse-T3.

>

> The reduced T3 level that occurs during illness, fasting, or stress

slows

> the metabolism of many tissues. Because of the slowed metabolism, the

body

> does not eliminate reverse-T3 as rapidly as usual. The slowed

elimination

> from the body allows the reverse-T3 level in the blood to increase

> considerably.

>

> In addition, during stressful experiences such as surgery and combat,

the

> amount of the stress hormone cortisol increases. The increase inhibits

> conversion of T4 to T3; conversion of T4 to reverse-T3 increases. The

same

> inhibition occurs when a patient has Cushing's syndrome, a disease in

which

> the adrenal glands produce too much cortisol. Inhibition also occurs

when a

> patient begins taking cortisol as a medication such as prednisone.

However,

> whether the increased circulating cortisol occurs from stress,

Cushing's

> syndrome, or taking prednisone, the inhibition of T4 to T3 conversion

is

> temporary. It seldom lasts for more than one-to-three weeks, even if

the

> circulating cortisol level continues to be high. Studies have

documented

> that the inhibition is temporary.

>

> A popular belief nowadays (proposed by Dr. Dennis ) has not been

proven

> to be true, and much scientific evidence tips the scales in the " false "

> direction with regard to this idea. The belief is that the process

involving

> impaired T4 to T3 conversion--with increases in reverse-T3--becomes

stuck. The

> " stuck " conversion is supposed to cause chronic low T3 levels and

chronically

> slowed metabolism. Some have speculated that the elevated reverse-T3 is

the

> culprit, continually blocking the conversion of T4 to T3 as a

competitive

> substrate for the 5'-deiodinase enzyme. However, this belief is

contradicted

> by studies of the dynamics of T4 to T3 conversion and T4 to reverse-T3

> conversion. Laboratory studies have shown that when factors such as

increased

> cortisol levels cause a decrease in T4 to T3 conversion and an increase

in T4

> to reverse-T3 conversion, the shift in the percentages of T3 and

reverse-T3

> produced is only temporary.

>

>

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