Mon, Feb-06-17, 11:15
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Senior Member
Posts: 15,075
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Plan: mostly milkfat
Stats: 190/152.4/154
BF:
Progress: 104%
Location: Ontario
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Again at the Authority Nutrition article, here's the claim;
A Moderate Carb Intake May Be Better for Some Women
Quote:
Certain women may do better consuming a moderate amount of carbs, or around 100–150 grams daily. This includes women who:
Have an underactive thyroid, despite taking medication (14).
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And here's the support, reference 14;
Quote:
Effect of caloric restriction and dietary composition of serum T3 and reverse T3 in man.
Spaulding SW, Chopra IJ, Sherwin RS, Lyall SS.
Abstract
To evaluate the effect of caloric restriction and dietary composition on circulating T3 and rT3 obese subjects were studied after 7-18 days of total fasting and while on randomized hypocaloric diets (800 kcal) in which carbohydrate content was varied to provide from 0 to 100% calories. As anticipated, total fasting resulted in a 53% reduction in serum T3 in association with reciprocal 58% increase in rT3. Subjects receiving the no-carbohydrate hypocaloric diets for two weeks demonstrated a similar 47% decline in serum T3 but there was no significant change in rT3 with time. In contrast, the same subjects receiving isocaloric diets containing at least 50 g of carbohydrate showed no significant changes in either T3 or rT3 concentration. The decline in serum T3 during the no-carbohydrate diet correlated significantly with blood glucose and ketones but there was no correlation with insulin or glucagon. We conclude that dietary carbohydrate is an important regulatory factor in T3 production in man. In contrast, rT3 concentration is not significantly affected by changes in dietary carbohydrate. Our data suggest that the rise in serum rT3 during starvation may be related to more severe caloric restriction than that caused by the 800 kcal diet.
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An 800 calorie diet. Based on this, the recommendation
Quote:
around 100–150 grams daily.
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is made, even though all it took to avoid significant changes to thyroid in the study was about 50 grams. If there's a basis for the recommendation, it's not to be found in the reference. Besides this--you can't look at thyroid changes on 800 calories a day, and say that the same would be true at say 1600 calories a day. Also--as I've said before, there's a difference between inappropriate hormone levels, and hormone levels that are simply appropriate to the diet (or lack of diet in the case of fasting).
Understand that I'm not trying to sell you personally on a low carb diet, if a poor outcome coincided with you eating that diet, it makes sense for you to avoid anything new you were doing when you had that outcome. But a lot of people need this bridge, there's no point in burning it down for them, too, without much better evidence.
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