Type 5 Diabetes
The Old Myth
Diabetes is type 1 or type 2. Lean patients are low-risk.
The Science
2025 WHO/IDF consensus formally classified a distinct form of diabetes in lean, young, undernourished patients — predominantly from South Asia and Sub-Saharan Africa. Beta-cell failure occurs without insulin resistance. The mechanism is different, the demographics are different, the treatment implications are different.
The Zinda Takeaway
A lean BMI does not protect against diabetes if you have The Fragile Engine. HbA1c and fasting glucose screening should apply to lean SA patients as well.