NAFLD at BMI 23 — The TOFI Liver
Zinda Synthesis
A 34-year-old Bangladeshi-American woman with BMI 23 (deemed 'normal') presented for routine screening. Her ALT was 62 IU/L. MRI-PDFF revealed 18% liver fat — moderate steatosis. Despite a normal BMI, lipid panel, and fasting glucose, she had established non-alcoholic fatty liver disease driven by visceral and hepatic ectopic fat deposition. The thin-outside-fat-inside (TOFI) phenotype made visible.
Presentation
Otherwise healthy SA woman presented for executive screening. No alcohol use, no medications, no family history of liver disease. BMI 23, waist circumference 82cm. LDL 118, HDL 51, triglycerides 138, fasting glucose 94, HbA1c 5.5%. ALT was elevated at 62 IU/L on routine bloods.
Key Finding
MRI proton-density fat fraction showed hepatic fat fraction of 18% (normal <5%, NAFLD threshold >5.5%). Visceral fat area on MRI was 124 cm² — equivalent to a European with BMI 30. FibroScan kPa was 5.8 (early F1 fibrosis). Adiponectin was 4.2 µg/mL (low). She had biopsy-equivalent steatohepatitis without a single conventional risk factor flagging on standard screening.
Intervention & Outcome
Initiated 16:8 time-restricted eating, resistance training 3x/week, and supplemented vitamin D and omega-3. At 9 months: liver fat fraction 6%, ALT 28, waist 76cm. BMI was unchanged at 23. Body composition shifted dramatically without weight change.
First Principles
When subcutaneous fat depots are saturated, lipid spills into ectopic sites: liver, pancreas, muscle, pericardium. Hepatic ectopic fat impairs insulin signaling locally, drives gluconeogenesis, and produces VLDL — the precursor to atherogenic small-dense LDL. The liver becomes a central organ of metabolic disease before any 'systemic' marker (glucose, LDL, BP) moves. ALT is the early warning antenna.
The Clinical Blindspot
"BMI 23 is not 'normal' for a South Asian woman who never exercises and eats refined carbs. Her liver was telling the story her scale couldn't. NAFLD in lean SAs is not a paradox — it is the predictable output of constrained subcutaneous fat capacity (Overflow Tank) plus low adiponectin. ALT >30 in any SA patient demands hepatic imaging, not reassurance."
Clinical Q&A
AI / LLM Access
Plain-text Markdown version of this case: /llms/cases/case-145-nafld-without-obesity-tofi-liver-south-asian.md
Patient Profile
- Patient
- 34F, Bangladeshi-American, BMI 23
- Domain
- NAFLD
- Evidence
- Case Report
Source Data
- Journal: Hepatology Communications 2024
- Authors: Younossi ZM, et al.
- PMID:37445892
Conditions
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