Myths vs facts: MTHFR and blood sugar

Myth: MTHFR variants (e.g., C677T) directly cause blood sugar issues or diabetes. Fact: MTHFR affects folate metabolism and homocysteine levels, but a causal link to blood sugar is not established. Some studies report weak associations between elevated homocysteine and insulin resistance, but evidence is conflicting and insufficient for clinical recommendations. Blood sugar regulation is primarily driven by diet, exercise, and body weight. A DNA test for MTHFR is not useful for blood sugar management – a blood homocysteine test would be more informative if levels are high. Beware of marketing claims labeling MTHFR as a 'diabetes gene'.