Although scarcely studied, the influence of triiodothyronine (T3; free or total) seems to be negative for obesity, insulin concentration, insulin resistance, systolic and diastolic blood pressure, and dyslipidemias (De Pergola et al. 2010; Chin et al. 2014; Roef et al. 2014), but is favored by hyperglycemia (De Pergola et al. 2010). Here, INS is linked to metabolic syndrome.