Myths vs facts: Homocystein and Blutzucker

Homocysteine and blood sugar are linked through several metabolic pathways, but the claim that homocysteine directly raises blood sugar is a myth. Studies show an association between elevated homocysteine and insulin resistance, but the evidence is mostly epidemiological and not causal. Homocysteine may impair endothelial function and promote oxidative stress, which could indirectly disturb glucose homeostasis. Conversely, poorly controlled blood sugar (e.g., in diabetes) can raise homocysteine levels due to kidney dysfunction or vitamin deficiencies. Fact: Elevated homocysteine is an independent risk factor for cardiovascular disease, but not for diabetes. Measuring homocysteine is useful when vitamin B12, B6, or folate deficiency is suspected, not as a routine test for blood sugar issues. Supplementing with B vitamins lowers homocysteine but does not improve blood sugar control according to current evidence. Beware of exaggerated marketing claims that label homocysteine as a 'blood sugar toxin.' The evidence is moderate, based on observational studies; randomized controlled trials are largely lacking.