|
The term TOFI, “thin-outside-fat-inside” is used to describe lean individuals with a disproportionate amount of fat (adipose tissue) stored within their abdomen. The figure to illustrate this shows two men, both aged 35 years, with a BMI of 25 kg/m2. Despite their similar size, the TOFI had 5.86 litres of internal fat, whilst the healthy control had only 1.65 litres. Subjects defined as TOFI with body mass index (BMI) <25 kg/m2 have increased levels of many of the risk factors associated with the metabolic syndrome. This phenotype is a further refinement of the “metabolically-obese but normal-weight” (MONW). Subjects defined as TOFI have been described as being at higher risk of developing insulin resistance and type II diabetes due to the fact that they have reduced physical activity/VO2max, reduced insulin sensitivity and higher abdominal adiposity and a more atherogenic lipid profile. Another important characteristic observed in this cohort of subjects is elevated levels of liver fat. ==Measurement of TOFI== To classify an individual as TOFI, it is essential to measure their internal fat content. The only way that this is possible is by using magnetic resonance Imaging (MRI) or CT scanning. The parameters of the MRI scanner are manipulated to show fat as bright (white) and lean tissue as dark. Indirect methods such as waist circumference are not suitable as individuals with an identical waist circumference can have vastly different levels of internal fat. The figure clearly shows that despite having an identical waist circumference (in this example all men had a waist of 84 cm), there is considerable variation in the amount of visceral fat (volumes shown on the image in litres) present. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「TOFI」の詳細全文を読む スポンサード リンク
|