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Author Topic:   Long term low carb diets...can they screw up your thyroid?
Buld0g

Amateur Bodybuilder

Posts: 179
From:don't worry 'bout it
Registered: Apr 2000

posted August 29, 2000 04:27 PM

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This topic came up when I asked a board member about t3, and he said the best time to do it is after months of lo-carb diets because your natural T-3/thyroid levels are very low... Any one know anything about this...is it true...and how can us lo-carbers prevent this.

THANX BROS

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[This message has been edited by Buld0g (edited August 29, 2000).]

[This message has been edited by Buld0g (edited August 29, 2000).]

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MS

Elite Bodybuilder

Posts: 764
From:Somewhere in the South Pacific
Registered: May 2000

posted August 29, 2000 05:57 PM

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Yes it's true. And it's a good thing, too, if you're not taking any AS. It seems to be your body's way of protecting it's muscle mass which would otherwise be cannabalized in a chronic low carb environment. The best things to try are either supplementing with T3 (preferably in the presence of AS) or to have occassional high-carb periods. The latter method is preferable because carbs are muscle-sparing at the same time they increase your natural thyroid output.

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Cheech

Amateur Bodybuilder

Posts: 72
From:Hollywood, CA
Registered: May 2000

posted August 29, 2000 06:03 PM

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Don't take T3. You can bring back your Thyroid by eating 2 weeks of hi carb 300 calories over your maintaince and then you cant start dieting again. T3 would be worse in the long run because once you get off of it you will gain the weight back rapidly If you return to your normal eating. It will take about a month or 2 to get your thyroid back in gear.

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Anabolicum Mister

Pro Bodybuilder

Posts: 504
From:Canada
Registered: Mar 2000

posted August 29, 2000 10:42 PM

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MS,

Does this also hold true on a CKD or do the carb-ups prevent the T3 downregulation?

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GetHuge

Amateur Bodybuilder

Posts: 140
From:
Registered: Jul 2000

posted August 30, 2000 09:57 AM

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Long term low carb dieting will cause your thyroid to slow down, reducing your metabolic rate. Be careful if your using T3 because the possible rebound effect could be devistating.

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MS

Elite Bodybuilder

Posts: 764
From:Somewhere in the South Pacific
Registered: May 2000

posted August 30, 2000 03:26 PM

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Anabolicum, the weekend carb-ups are very good at keeping your Thyroid levels functioning normally. I assumed Buld0g was referring to an Atkins type of chronic low-carb diet. If he meant CKD, then I take it all back. But I would like to re-emphasize that T3 is not a good supplement for people who aren't on some sort of AS. A regular carb-up is safer and more effective.

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cockdezl

Amateur Bodybuilder

Posts: 286
From:
Registered: 2000

posted August 30, 2000 09:03 PM

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All diets that reduce calories cause a reduction in T3 formation, low carb or high carb. Low carb tends to be a little faster due to the rapid reduction in liver glycogen stores. I don't think the carb-up is sufficient to prevent this from occuring.

One idea is to supplement with phosphate salts, which have been shown to prevent the reduction in metabolism during a diet.

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