High glycemic index foods raise thyroid levels, saturated fats drop them?

[ecstatichamster]

The effect of food groups and nutrients on thyroid hormone levels in healthy individuals - PubMed

In our study, frequent consumption of foods with a high glycemic index showed a positive association with fT3 and fT4 levels and a negative association with TSH levels, whereas foods rich in saturated fatty acids and with a high protein concentration showed a negative association with fT3 and...

pubmed.ncbi.nlm.nih.gov

Abstract​

Objectives: The aim of the study was to analyze the association of dietary groups (groups of food items) with thyroid hormone levels in healthy individuals.
Methods: This cross-sectional study enrolled 4585 healthy individuals from the Dalmatian region of south Croatia with measurements of plasma free triiodothyronine (fT3), free thyroxine (fT4), and thyroid-stimulating hormone (TSH) levels. Dietary intake was assessed according to data of the completed food frequency questionnaire, containing 58 food items. Principal component analysis was performed to reduce food items into dietary groups, followed by linear regression analyses to test the association between dietary groups and fT3, fT4, and TSH levels.
Results: Among the 4585 healthy individuals, we observed lower plasma fT3 and fT4 levels and higher TSH levels in women than in men. Smokers were found to have significantly lower TSH levels than non-smokers and ex-smokers, and participants with higher fasting glucose levels had higher fT4 levels. Different dietary groups (factors) showed association with fT3, fT4, and TSH levels. It was observed that dietary factors (with frequent consumption of fruit juices, Cedevita vitamin drink, and non-alcoholic drinks) that negatively affected TSH levels simultaneously had a positive effect on fT4, satisfying the expected pattern of effects.
Conclusions: In our study, frequent consumption of foods with a high glycemic index showed a positive association with fT3 and fT4 levels and a negative association with TSH levels, whereas foods rich in saturated fatty acids and with a high protein concentration showed a negative association with fT3 and fT4 levels.

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So if high glycemic foods increase T3 and T4, and lower TSH, that is a good thing in a way...

High sat fat foods and high protein lower T3 and T4...

 

[Lokzo]

The effect of food groups and nutrients on thyroid hormone levels in healthy individuals - PubMed

In our study, frequent consumption of foods with a high glycemic index showed a positive association with fT3 and fT4 levels and a negative association with TSH levels, whereas foods rich in saturated fatty acids and with a high protein concentration showed a negative association with fT3 and...

pubmed.ncbi.nlm.nih.gov

Abstract​

Objectives: The aim of the study was to analyze the association of dietary groups (groups of food items) with thyroid hormone levels in healthy individuals.
Methods: This cross-sectional study enrolled 4585 healthy individuals from the Dalmatian region of south Croatia with measurements of plasma free triiodothyronine (fT3), free thyroxine (fT4), and thyroid-stimulating hormone (TSH) levels. Dietary intake was assessed according to data of the completed food frequency questionnaire, containing 58 food items. Principal component analysis was performed to reduce food items into dietary groups, followed by linear regression analyses to test the association between dietary groups and fT3, fT4, and TSH levels.
Results: Among the 4585 healthy individuals, we observed lower plasma fT3 and fT4 levels and higher TSH levels in women than in men. Smokers were found to have significantly lower TSH levels than non-smokers and ex-smokers, and participants with higher fasting glucose levels had higher fT4 levels. Different dietary groups (factors) showed association with fT3, fT4, and TSH levels. It was observed that dietary factors (with frequent consumption of fruit juices, Cedevita vitamin drink, and non-alcoholic drinks) that negatively affected TSH levels simultaneously had a positive effect on fT4, satisfying the expected pattern of effects.
Conclusions: In our study, frequent consumption of foods with a high glycemic index showed a positive association with fT3 and fT4 levels and a negative association with TSH levels, whereas foods rich in saturated fatty acids and with a high protein concentration showed a negative association with fT3 and fT4 levels.

--
So if high glycemic foods increase T3 and T4, and lower TSH, that is a good thing in a way...

High sat fat foods and high protein lower T3 and T4...

freaking awesome find.

Thanks for sharing mate!!

 

[lampofred]

Peat said all fat, even saturated fat, slows metabolism, although saturated fat isn't actually damaging to the thyroid like PUFA. And the protein they were consuming was probably high in phosphate, tryptophan, methionine, cysteine, which are all anti-thyroid. Peat says it's better to go low protein than to get most of your protein from meat.

 

[Lejeboca]

Didn't read the entire study itself yet. However, I wonder how representative is this correlation of (healthy) populations in general? In other words how much the high altitude (and high CO2) of Dalmatian region plays into the experiment setup?

From wiki: "Most of the land area is covered by the Dinaric Alps mountain range running from north-west to south-east. The hills and mountains lie parallel to the coast, which gave rise to the geographic term Dalmatian concordant coastline." and further: "
The Dinaric Alps extend for approximately 645 kilometres (401 mi) along the Western Balkan Peninsula from the Julian Alps to the northwest in Italy, downwards to the Šar and Korab massif, where their direction changes. The Albanian Alps, or Prokletije, is the highest section of the entire Dinaric Alps; this section stretches from Albania to Kosovo and eastern Montenegro. Maja Jezercë is the highest peak and is located in Albania, standing at 2,694 metres (8,839 ft) above the Adriatic. The Dinaric Alps are one of the most rugged and extensive mountainous areas of Europe,"