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ASSOCIATION OF THYROID FUNCTION WITH BMI, BODY FAT % AND VISCERAL FAT LEVEL IN HEALTHY EUTHYROID INDIVIDUALS.

BACKGROUND

Obesity is a condition in which excess body fat has accumulated to the extent that it may have a negative effect on health leading to a reduced life expectancy and increased health problems. It may be associated with various health problems including cardiovascular disease, diabetes, insulin resistance and metabolic disorders. [1]

Metabolic syndrome is an important predictor of cardiovascular risk and is a cluster of abnormalities such as abdominal obesity, dyslipidaemia, high plasma glucose and hypertension. Thyroid hormones are known to have a variety of effects on metabolic syndrome determinants and studies have shown association between thyroid hormone levels and metabolic syndrome in euthyroid patients, though conflicting results are there which may be due to ethnic variation apart from other factors. [2,3]

Body composition and thyroid hormones appear to be closely related as thyroid hormones is known to be involved in the regulation of basal metabolism and thermogenesis, playing an important role in lipid and glucose metabolism, food intake and fat oxidation. [4]

The relation between thyroid function and weight might also be of importance, as overweight is associated with increased morbidity and disability. Studies have found significant association of TSH within the normal reference range with body weight. [5] Body Mass Index (BMI) is a very relevant parameter to decide if a person is obese.

Weight change is largely due to an imbalance in energy intake and expenditure. It is also well recognised as common manifestation of overt thyroid dysfunction, as thyroid hormones are known to regulate the resting energy expenditure. The potential mechanism underlying the association between body fat %, visceral fat level and thyroid function are less clear among euthyroid individuals, in whom it is possible that weight change could precede subsequent changes in thyroid hormone T3, T4 and TSH levels. It is not clear whether obesity per se may influence thyroid function or if small differences in thyroid function within the normal range might play a role in modulating weight.

Studies are needed to evaluate whether subclinically low thyroid function, even those in normal serum TSH concentration range can cause obesity and increase cardiovascular risks.

The present study aims to assess the BMI and correlate with TSH, f T3, f T4, body fat %, visceral fat level in healthy euthyroid individuals to see if any association between obesity and thyroid status exists.

MATERIALS AND METHODS

This cross-sectional study was conducted at Jawaharlal Nehru Institute of Medical Sciences (JNIMS), Imphal, Manipur. A total of 100 healthy volunteers were screened among the staffs of JNIMS.

Healthy adults without any self-reported thyroid disease or any treatment related with thyroid, in the age group of 2035 years were screened from among the staffs of JNIMS.

Subjects with any H/O thyroid disease (past or present), cigarette smokers, subject with chronic liver disease, renal disease, pregnancy, congestive heart disease, malnutrition or malignant disease or those taking drugs that may affect thyroid functions (Lithium, amiodarone, steroids, beta blockers, interferon) and subjects using drugs which may affect body water-lipid, homeostasis like diuretics or oral contraceptives were excluded from the study.

An informed written consent was obtained from all the subjects after the objectives and procedure of the study was explained to them. The study was approved by the Ethical Committee of the institute.

Weight was measured by using a standard weighing machine without shoes to the nearest 0.5 kg and height was measured by using a height meter without shoes to the nearest 0.5 cm. Body Mass Index (BMI) was calculated using Quetelet index and WHO classification (6) was used for interpretation of the findings.

Subjects were classified according to their Body Mass Index (BMI) as

1. Underweight: < 18.5 kg/ [m.sup.2]

2. Normal weight: 18.5 - 24.9 kg/ [m.sup.2]

3. Overweight: 25 - 29.9 kg/ [m.sup.2]

4. Obese: > 30 kg/ [m.sup.2]

TSH, f T3 and f T4 levels were measured by using chemiluminescent immunoassay and subjects with TSH value between 0.3 - 3.6 mIU/L were taken for the study. Eight (8) subjects whose TSH is more than 3.6 mIU/L were excluded from the study.

Body fat % and visceral fat level were measured by Bioelectrical Impedance (BI) method by using Omron-HBF-212 (Body Composition Monitor) with each subject in a standing position without shoes, wearing light clothes. The obesity classification value advocated by Lohman (in 1986) and Nagamine (in 1972) is used as reference.
Body Fat %             Male              Female
Classification

-(Low)                   5.0 to 9.9%      5.0 to 19.9%
0(Normal)               10.0 to 19.9%     20.0 to 29.9%
+(High)                 20.0 to 24.9%     30.0 to 34.9%
++(Very High)             25.0% to          35.0% to

According to Omron Healthcare Figures

Level Classification   Visceral Fat Level

0(Normal)                  1 to 9
+(High)                   10 to 14
++(Very High)             15 to 30


Statistical Analysis

Data was analysed using SPSS version 22. The association between variables was determined using ANOVA. P value less than 0.05 was considered statistically significant.

RESULTS

A total of 100 subjects were screened among the staffs of JNIMS and 8 were excluded from the study as their TSH values were more than 3.6 mIU/L.

In the present study, 92 subjects with mean age of 27.83 [+ or -] 8.70 years including 54 males with mean age of 26.52 [+ or -] 7.88 years and 38 females with mean age of 29.68 [+ or -] 9.56 years were recruited.

The mean value of the various variables assessed is shown in Table 1. As shown in Table 2 most of the participants 38 (41.3%) were overweight, while 8 (8.70%) were obese.

As shown in Table 3, there was significant association between BMI and serum TSH, body fat % and visceral fat level. The mean value of TSH, body fat % and visceral fat level were higher in those subjects who were overweight and obese.

In the present study, among the subjects, body Fat % of 44 (47.83%) were in the category of very high body fat %, 16 (17.39%) had high, while 28 (30.43%) had normal body fat %. Only 4 (4.35%) had low level of body fat %.

As shown in Table 5, there was significant association between various grades of visceral fat level with f T3. Among the subjects, 6 (6.52%) had very high level of visceral fat, while 24 (26.09%) had high level of visceral fat. 62 (67.39%) subjects had normal visceral fat level.

Our study showed significant association of TSH (p=0.025), body fat % (p=0.000) and visceral fat level (p=0.000) with BMI. There was no statistically significant association between body fat % and TSH, f T3 and f T4. There was significant association between visceral fat level and f T3.

DISCUSSION

In the present study there was significant association between BMI and TSH (p= 0.025), body fat % (p= 0.000) and visceral fat level (p= 0.000).

Similar to our findings, studies have found that mean TSH serum levels increased with increasing BMI and there is an inverse correlation between free thyroxine (fT4) values and Body Mass Index (BMI), even when fT4 values remain in normal range. They found no association between BMI and serum f T3.78 Other studies also found significant relationship between TSH and increasing BMI. [5,9-11]

This association between TSH and BMI was thought to be due to influence of adipose tissue signals and leptin may have significant effects on central regulation of thyroid function through TRH. [12] The synthesis of TSH and thyroid hormones may be affected by adipose tissue and calorie intake. The mechanism for such a relation would be related to secretion of leptin by adipose tissue. [13] The level of leptin is directly correlated to the amount of adipose tissue and leptin has been reported to stimulate the biosynthesis of TSH in vitro. [14] The increased blood concentration of TSH may be the high levels of leptin found in obese subjects. [15]

Studies have revealed that fat cells and precursor forms have receptors for TSH and TSH may directly stimulate the production of leptin by adipocytes. [16] Association between TSH concentration and BMI is stronger in severely obese participants than in mildly obese participants. [17]

Contrary to our findings, studies found no evidence of association between TSH within the normal range and BMI. [18-20]

Body fat % refers to the amount of body fat mass in regard to the total body weight expressed as percentage. In the present study, there was no significant association between Body Fat%, TSH, f T3 and f T4. Similar to our study, Kok et al 2005 found no significant correlation between TSH and percentage total body fat and visceral and subcutaneous fat.21 Teixeira et al 2009 observed that BMI, Body Fat %, waist circumference and fat mass index were not correlated with TSH. [22] Choi et al 2008 in their study found no significant correlation between TSH level and BMI or Fat %. [23]

Contrary to our study, Pinkney JH et al 1998 in their study found correlation between plasma TSH levels and percentage of body fat. [24] Ortiga et al 2007 found plasma TSH concentration positively associated with body weight and percentage body fat. [25] Galofre et al 2008 also found positive correlation between TSH and body fat %. [17]

Zhang J et al 2012 in their study found that serum TSH in normal range is significantly correlated with BMI and percentage of body fat in females. [26] Sanhita et al 2015 found that serum TSH level increases with increase in fat content of the body. Obese women shows higher serum TSH level even if the upper limit of TSH is within normal limit. [27] The positive correlation between TSH and BF% may be due to increased concentration of leptin and pro-opiomelanocortin in obese patients which stimulate Thyrotropin Releasing Hormone (TRH) neurons in the paraventricular nucleus leading to an increment in TSH. [24,28] TSH can directly stimulate leptin secretion by adipocytes. [16] The presence of TSH receptors in adipose tissue causes proliferation of adipose tissue and differentiation of preadipocytes into adipocytes. [29,30] Higher levels of leptin are proportional to overall fat percentage and some studies have shown a positive correlation with TSH levels. [24,31]

In the present study among the subjects 6 (6.52%) had very high level of visceral fat, while 24 (26.09%) had high level of visceral fat. This high level of visceral fat is thought to be closely linked to increased levels of fat in bloodstream, which can lead to hyperlipidaemia and diabetes. Visceral adiposity is associated with cardiovascular risk factors and increased cardiovascular risk. Our study showed significant association between f T3 and visceral fat level and also between BMI and visceral fat level. There is increased visceral fat level in overweight and obese subjects. Studies have shown that triiodothyronine controls metabolic and energy homeostasis and thus influences body weight and TSH via receptors in fat tissues inducing differentiation of preadipocytes to adipocytes and expansion of adipose tissue. [32] Thyroxine promotes protein synthesis and growth and also helps to regulate the body's metabolism. Studies found reduced gene expression of TSH and f T3 receptors in both subcutaneous and visceral fat in obese subjects. They thought that the increase in plasma TSH and f T3 in obesity may be an attempt to cope with the peripheral resistance as a consequence of the hypertrophy changes of adipocytes. [33] They also reported that obesity may play an important role in modifying the thyroid hormones and TSH receptor gene expression in both subcutaneous and visceral adipose tissue. Waist circumference is more closely associated with visceral fat than BMI and another study reported that the TSH concentration is associated with the amount of subcutaneous but not preperitoneal fat indicating that serum TSH concentration may have a more marked effect on total body fat than on visceral fat. [20]

Visceral Abdominal Adipose Tissue (VAAT) surrounds the internal organs and increased levels of VAAT are more significant than increased levels of subcutaneous fat in terms of the risk of metabolic syndrome, insulin resistance and cardiovascular mortality. [34] An association between high level TSH and increased VAT (visceral adipose tissue) thickness has been demonstrated. This association between TSH levels and VAT may be the cause for increased cardiovascular risk associated with elevated TSH plasma concentration within the normal range. [35] Giovanna Muscogiuri 2012 et al found strong correlation between thyroid function and abdominal adipose tissue in particular with visceral adipose tissue. [36] Visceral fat is body fat that is stored within the abdominal cavity and is therefore stored around a number of important internal organs such as the liver, pancreas and intestines. Visceral fat is sometimes referred to as 'active fat,' because research has shown that this type of fat plays a distinctive and potentially dangerous role affecting how our hormones function and is associated with increased risks of a number of health problems such as diabetes, hyperlipidaemia and cardiovascular diseases.

CONCLUSION

In the present study, significant correlation was found between BMI and TSH, fT3, fT4, body fat % and visceral fat level. There is an increase in body fat % and visceral fat level, even if the TSH is within normal limits. This increased level may lead to increased risk for development of obesity related health problems even in euthyroid individuals. It is therefore important to keep the body weight, body fat % and visceral fat level at acceptable levels to prevent or improve conditions of common diseases.

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Yumnam Anjana Devi (1), Keisam Reetu Devi (2), Avinash Keisam (3), Sangeeta Mayanglambam (4)

(1) Associate Professor, Department of Physiology, JNMS, Imphal, Manipur, India.

(2) Assistant Professor, Department of Physiology, JNIMS, Imphal, Manipur, India.

(3) Assistant Professor, Department of Community Medicine, JNIMS, Imphal, Manipur, India.

(4) Demonstrator, Department of Physiology, JNIMS, Imphal, Manipur, India.

'Financial or Other Competing Interest': None.

Submission 26-06-2018, Peer Review 08-07-2018, Acceptance 11-07-2018, Published 16-07-2018.

Corresponding Author: Keisam Reetu Devi, Assistant Professor, Department of Physiology, JNIMS, Imphal, Porompat-795005, Manipur, India.

E-mail: keisamreetu@yahoo.co.in

DOI: 10.14260/jemds/2018/737
Table 1. Distribution of variables among the
Study Subjects (Mean [+ or -] SD)

                  Total (n=92)             Males (n=54)

Age               27.83 [+ or -] 8.7       26.52 [+ or -] 7.88
BMI               24.28 [+ or -] 4.66      25.15 [+ or -] 5.20
TSH (mIU/L)       2.44 [+ or -] 1.38       2.77 [+ or -] 1.46
F T3 (pmol/L)     2.69 [+ or -] 0.73       2.67 [+ or -] 0.82
F T4 (pmol/L)     1.76 [+ or -] 2.14       1.55 [+ or -] 1.57
Body Fat %        29.17 [+ or -] 9.18      27.74 [+ or -] 10.76
Visceral Fat      7.78 [+ or -] 5.20       8.93 [+ or -] 6.08

                  Females (n=38)

Age               29.68 [+ or -] 9.56
BMI               23.05 [+ or -] 3.50
TSH (mIU/L)       1.96 [+ or -] 1.12
F T3 (pmol/L)     2.71 [+ or -] 0.58
F T4 (pmol/L)     2.06 [+ or -] 2.77
Body Fat %        31.19 [+ or -] 5.86
Visceral Fat      6.16 [+ or -] 3.00

Table 2. Distribution of Subjects according to Grades of
Body Mass Index (BMI)

Grades of BMI            Total (n=92)    Males (n=54)    Females (n=38)

Underweight: < 18.5      12 (13.04%)     8(14.81%)       4(10.53%)
kg/[m.sup.2]

Normal weight:           34 (36.96%)     16(29.63%)      18 (47.37%)
18.5-24.9 kg/[m.sup.2]

Overweight: 25--29.9     38 (41.30%)     22(40.74%)      16 (42.11%)
kg/[m.sup.2]

Obese: > 30              8 (8.70%)       8(14.81%)       0 (0%)
kg/[m.sup.2]

Table 3. Association between BMI and TSH, fT3, fT4, Body
Fat %, Visceral Fat Level in the Total Subjects (Mean [+ or -] SD)

Variable             Underweig ht (n=12)    Normal (n=34)

TSH (mIU/L)          2.60 [+ or -] 0.82     1.99 [+ or -] 0.90
fT3 (pmol/L)         2.93 [+ or -] 0.30     2.71 [+ or -] 0.53
fT4 (pmol/L)         1.17 [+ or -] 0.16     1.19 [+ or -] 0.68
Body Fat %           14.75 [+ or -] 4.80    25.65 [+ or -] 5.2 2
Visceral Fat Level   2.17 [+ or -] 1.40     4.47 [+ or -] 1.16

Variable             Overweig ht (n=38)     Obese (n=8)

TSH (mIU/L)          2.55 [+ or -] 1.70     3.55 [+ or -] 1.49
fT3 (pmol/L)         2.71 [+ or -] 0.91     2.10 [+ or -] 0.71
fT4 (pmol/L)         2.38 [+ or -] 3.10     2.12 [+ or -] 1.06
Body Fat %           34.02 [+ or -] 5.7 5   42.70 [+ or -] 1.8 9
Visceral Fat Level   9.95 [+ or -] 1.86     20.0 [+ or -] 4.59

Variable             P value

TSH (mIU/L)          0.025 *
fT3 (pmol/L)         0.081
fT4 (pmol/L)         0.078
Body Fat %           0.000 ***
Visceral Fat Level   0.000 ***

* p < 0.05, *** p < 0.001

Table 2. Distribution of Subjects according to Grades of
Body Mass Index (BMI)

Grades of BMI                           Total (n=92)   Males (n=54)

Underweight: < 18.5 kg/[m.sup.2]        12 (13.04%)     8(14.81%)
Normal weight: 18.5-24.9 kg/[m.sup.2]   34 (36.96%)     16(29.63%)
Overweight: 25-29.9 kg/[m.sup.2]        38 (41.30%)     22(40.74%)
Obese: > 30 kg/[m.sup.2]                 8 (8.70%)      8(14.81%)

Grades of BMI                           Females (n=38)

Underweight: < 18.5 kg/[m.sup.2]          4(10.53%)
Normal weight: 18.5-24.9 kg/[m.sup.2]    18 (47.37%)
Overweight: 25-29.9 kg/[m.sup.2]         16 (42.11%)
Obese: > 30 kg/[m.sup.2]                    0 (0%)

Table 5. Association of Visceral Fat Level and
TSH, f T3, f T4 (Both Sex)

Visceral Fat Level     TSH                    f T3

Normal                 2.25  [+ or -] 1.46    2.69 [+ or -] 0.72
High                   2.79 [+ or -] 1.14     2.87 [+ or -] 0.65
Very High              2.97 [+ or -] 1.22     1.90 [+ or -] 0.72
P value                0.168                  0.013*

Visceral Fat Level     f T4

Normal                 1.57 [+ or -] 1.43
High                   2.06 [+ or -] 3.44
Very High              2.53 [+ or -] 1.74
P value                0.428

* p < 0.05
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Title Annotation:Original Research Article; body mass index
Author:Devi, Yumnam Anjana; Devi, Keisam Reetu; Keisam, Avinash; Mayanglambam, Sangeeta
Publication:Journal of Evolution of Medical and Dental Sciences
Article Type:Report
Date:Jul 16, 2018
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