Is Vitamin D 25-OH useful for Abnehmen?

The question of whether vitamin D (measured as 25-OH vitamin D) is useful for weight loss is not clearly supported by evidence. Observational studies have found an association between low vitamin D levels and higher body weight, but randomized controlled trials (RCTs) have not demonstrated a causal effect on weight loss. Vitamin D is primarily important for bone health and immune function, not as a standalone weight loss agent. The evidence is mixed and weak. Caveat: Supplementation should only be done under medical supervision, as high doses can be toxic. The 25-OH level is a biomarker for vitamin D status, but optimizing this level alone does not necessarily lead to weight loss. For weight loss, a combination of calorie restriction, exercise, and adequate sleep is recommended – vitamin D may play a supportive role at best, but not a primary one.