Evidence check: Zink in the context of weight loss

Zinc is an essential trace mineral involved in numerous metabolic processes, including insulin sensitivity, thyroid function, and appetite regulation. Some human studies suggest that zinc supplementation may promote modest weight loss in individuals with zinc deficiency or conditions such as obesity and type 2 diabetes. Meta-analyses have shown small but significant effects on BMI and body fat percentage. However, the evidence is not consistent; many studies have methodological limitations, and benefits in non-deficient individuals are unclear. Excessive zinc intake can be toxic (e.g., inducing copper deficiency). In the context of consumer genetic tests (e.g., MyBody-X), there are no well-validated markers that justify personalized zinc recommendations for weight loss. The evidence is rated as 'human-moderate.' Caveat: Zinc should not be used as a standalone weight loss strategy; a balanced diet and lifestyle changes are essential.