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Getting the latest healthcare news for you
Getting the latest healthcare news for you
A large German study found that higher body fat — including visceral and liver fat — is linked to lower kidney function, particularly in women and adults over 40. The reverse was true for younger adults. One bright spot: greater fat-free mass (think muscle) was associated with better kidney function across all ages.
A German population-based study of over 4,200 adults found a clear pattern: the more body fat you carry — whether measured by BMI, waist circumference, visceral fat, or liver fat — the lower your estimated kidney filtration rate (eGFR). The findings were especially pronounced in women and in adults aged 40 and older.
There's a notable age twist, though. In adults under 40, higher body or fat mass was actually associated with higher eGFR values — likely reflecting normal physiological adaptation. But once past 40, that relationship flips, and excess fat becomes a drag on kidney function. Meanwhile, higher fat-free mass (a proxy for muscle) was consistently linked to better kidney function, particularly in older adults.
Key Takeaways:
Why it matters: These findings reinforce that body composition — not just weight — matters for kidney health. Clinicians may want to pay closer attention to fat distribution, particularly in women and middle-aged or older patients, as part of routine kidney function monitoring.
