Review
Copyright ©The Author(s) 2025.
World J Gastroenterol. Jun 28, 2025; 31(24): 107661
Published online Jun 28, 2025. doi: 10.3748/wjg.v31.i24.107661
Table 1 Definitions of metabolic syndrome[22,199]

NCEP ATP III (2005)[199]
IDF (2005)[22]
Criteria requiredThree of five criteria belowCentral obesity required plus two other required criteria
ObesityWaist circumference: > 40 inches (101 cm) in men; > 35 inches (88 cm) in womenWaist circumference based on ethnicity1
Insulin resistance-serum glucoseFasting serum glucose ≥ 100 mg/dL (≥ 5.6 mmol/L); or medical therapy for hyperglycaemiaFasting serum glucose ≥ 100 mg/dL (≥ 5.6 mmol/L); or medical therapy for hyperglycaemia
Dyslipidaemia-serum triglyceridesSerum triglyceride level ≥ 150 mg/dL (> 1.7 mmol/L); or medical therapy for dyslipidaemiaTriglyceride level ≥ 150 mg/dL (> 1.7 mmol/L); or medical therapy for dyslipidaemia
Dyslipidaemia-serum HDL-CSerum HDL-C: < 40 mg/dL (< 1.03 mmol/L) in men; < 50 mg/dL (< 1.29 mmol/L) in women; or medical therapy for dyslipidaemiaSerum HDL-C: < 40 mg/dL (< 1.03 mmol/L) in men; < 50 mg/dL (< 1.29 mmol/L) in women; medical therapy for dyslipidaemia
HypertensionSystolic blood pressure ≥ 130 mmHg; or diastolic blood pressure ≥ 80 mmHg; or medical therapy for hypertensionSystolic blood pressure ≥ 130 mmHg; or diastolic blood pressure ≥ 80 mmHg; or medical therapy for hypertension
Table 2 Observational studies examining prevalence of metabolic disorders in patients with inflammatory bowel disease[22,32-38,40,44,47,49,50,117,118,122,188,195,197,200-204]
Ref.
Country
Study type
Reference criteria
Total number of IBD patients (CD/UC/IBD-U)
Prevalence in IBD (%)
Prevalence in CD (%)
Prevalence in UC (%)
Metabolic syndrome
Nagahori et al[32]JapanProspective, cross-sectional cohortNCEP-ATP III[188]102 (28/74/-)18.67.123.0
Yorulmaz et al[38]TurkeyProspective cross-sectional cohortIDF[22]177 (62/115/-)25.417.729.5
Sourianarayanane et al[34]United StatesRetrospective cohortNCEP-ATP III[188]217 (110/107/-)16.6
Fitzmorris et al[200]United StatesRetrospective cohortIDF[22]868 (868/-/-)4.3
Carr et al[35]United StatesRetrospective cohortNCEP-ATP III[188]84 (60/24/-)23.020.029.0
Sartini et al[201]ItalyRetrospective cohortNCEP-ATP III[188]78 (42/36/-)23.1
Dragasevic et al[37]SerbiaProspective, cross-sectional cohortNCEP-ATP III[188] and IDF[22]104 (50/54/-)32.736.029.6
Magrì et al[36]ItalyProspective cohortNCEP-ATP III[188]178 (83/95/-)19.1
Jovanovic et al[202]SerbiaRetrospective cohortNCEP-ATP III[188]89 (-/89/-)81.0
Kang et al[33]KoreaRetrospective cohortNCEP-ATP III[188]443 (274/169/-)10.6
Obesity
Long et al[44]United StatesProspective cross-sectional cohortBMI ≥ 30 kg/m21598 (paediatric population) (1027/571/-)23.620.030.1
Nic Suibhne et al[50]IrelandProspective case-control studyBMI ≥ 30 kg/m2100 (100/-/-)17.0
Flores et al[49]United StatesRetrospective cohortBMI ≥ 30 kg/m2581 (297/284/-)32.730.335.2
Seminerio et al[47]United StatesRetrospective cohortBMI ≥ 30 kg/m21494 (860/634/-)31.527.032.0
Elangovan et al[40]United StatesRetrospective cohortBMI ≥ 30 kg/m2286, 760 (-/-/-)37.336.938.5
Metabolic fatty liver disease
Martínez-Domínguez et al[117]SpainProspective cross-sectional cohortMASLD[197]646 (-/-/-)45.7
Zhang et al[122]United KingdomProspective cross-sectional cohortMASLD[197]4203 (1217/2642/344)36.4
Oliveira et al[203]BrazilProspective cross-sectional cohortMASLD[197]140 (89/51/-)50.744.943.1
McHenry et al[118]United StatesProspective cross-sectional cohortNAFLD[195]363 (363/-/-)39.7
Hyun et al[204]KoreaProspective cross-sectional cohortNAFLD[195]3356 (1129/2227/-)16.711.819.2
Zhang et al[123]United KingdomProspective cross-sectional cohortMASLD[197]4622 (1313/2914/-)38.1
Table 3 Definitions of obesity based on waist circumference in men and women stratified by reference population[199,205-210]
Reference population
Reference criteria
Waist circumference threshold for men
Waist circumference threshold for women
EuropoidIDF[199]≥ 94 cm≥ 80 cm
CaucasianWHO[205]≥ 94 cm = increased risk; ≥ 102 cm = higher risk≥ 80 cm = increased risk; ≥ 88 cm = higher risk
United States of AmericaATP III[206]≥ 102 cm≥ 88 cm
CanadaHealth Canada[207,208]≥ 102 cm≥ 88 cm
EuropeanEuropean Cardiovascular Societies[209]≥ 102 cm≥ 88 cm
AsianIDF[199] and WHO[205]≥ 90 cm≥ 80 cm
JapaneseJapanese Obesity Society[210]≥ 85 cm≥ 90 cm
ChinaCooperative Task Force≥ 85 cm≥ 90 cm
Middle East/MediterraneanIDF[199]≥ 94 cm≥ 80 cm
Sub-Saharan AfricaIDF[199]≥ 94 cm≥ 80 cm
Ethnic Central and South AmericanIDF[199]≥ 90 cm≥ 80 cm
Table 4 Observational studies examining the risk of cardiovascular disorders in patients with inflammatory bowel disease[16,98,99]
Ref.
Country
Study type
Total number of IBD patients (CD/UC/IBD-U)
Risk in IBD vs non-IBD HR (95%CI)
Risk in CD vs non-IBD HR (95%CI)
Risk in UC vs non-IBD HR (95%CI)
Ischaemic heart disease
Zhu et al[16]United KingdomProspective cross-sectional cohort5496 (1861/3635)HR = 0.93 (0.64-1.36)HR = 1.29 (1.03-1.62)
Heart failure
Aniwan et al[99]United StatesRetrospective cohort736 (339/397/-)aHR = 2.03 (1.36-3.03)aHR = 1.73 (0.98-3.07)aHR = 2.06 (1.18-3.65)
Zhu et al[16]United KingdomProspective cross-sectional cohort5496 (1861/3635/-)HR = 1.72 (1.22-2.42)HR = 1.38 (1.07-1.80)
Sun et al[98]SwedenProspective cross-sectional cohort81749 (24303/45709/11737)aHR = 1.19 (1.15-1.23)aHR = 1.28 (1.20-1.36)aHR = 1.14 (1.09-1.19)
Ischaemic stroke
Zhu et al[16]United KingdomProspective cross-sectional cohort5496 (1861/3635/-)HR = 1.32 (0.82-2.12)HR = 1.59 (1.16-2.14)
Table 5 Definitions of metabolic liver diseases[211-213]

NAFLD[211]
MAFLD[212]
MASLD[213]
Required criteriaRadiological or Histological evidence of hepatic steatosis
Cardiometabolic risks requiredAt least 1 of the following 3 criteria required: (1) Obesity: BMI ≥ 25 kg/m2 in Caucasians; or BMI ≥ 23 kg/m2 in Asians; (2) Fasting glucose ≥ 100 mg/dL (≥ 5.6 mmol/L), or on treatment for hyperglycaemia; and (3) Two or more of the following: Elevated waist circumference (Table 2); Systolic blood pressure ≥ 130 mmHg; Diastolic blood pressure ≥ 85 mmHg; Serum triglycerides ≥ 150 mg/dL (> 1.7 mmol/L); HDL-C < 40 mg/dL (< 1.03 mmol/L); hsCRP > 2 mg/L; Insulin resistance-HOMA-IR ≥ 2.5; or On treatments for diabetesAt least 1 of the following 5 criteria required: (1) Obesity defined by BMI ≥ 25 kg/m2 in Caucasians; or BMI ≥ 23 kg/m2 in Asians; or elevated waist circumference: > 94 cm (males), > 80 cm (females); (2) Fasting glucose ≥ 100 mg/dL (≥ 5.6 mmol/L), or glucose level post glucose tolerance test ≥ 140 mg/dL (7.8 mmol/L), or HbA1c ≥ 5.7% (39 mmol/L) or on treatment for hyperglycaemia; (3) Systolic blood pressure ≥ 130 mmHg or diastolic blood pressure ≥ 85 mmHg, or on anti-hypertensive treatment; (4) Serum triglycerides ≥ 150 mg/dL (> 1.7 mmol/L) or on lipid lowering therapy; and (5) HDL-C < 40 mg/dL (< 1.03 mmol/L) in men of < 50 mg/dL (< 1.29 mmol/L) in women or on treatment for dyslipidaemia
Additional criteriaOther causes of hepatic steatosis excluded