With slight variation between different studies, body weight is categorized according to the body mass index (BMI): non-obese (<25 kg/m2), overweight (25–30 kg/m2), moderately obese (30–40 kg/m2), morbidly obese (>40 kg/m2). LDL, low-density lipoprotein; HDL, high-density lipoprotein; NSD, no significant difference; SNP, single nucleotide polymorphism; UTR, untranslated region; Δ, deletion.