Thank you for sharing your valuable observations on nutritional approach especially in the US. To answer your question, adequate copper levels are necessary for maintaining proper glucose homeostasis, as copper-dependent enzymes participate in glucose metabolism and insulin signaling pathways. Copper deficiency can lead to impaired glucose tolerance and insulin resistance, which are risk factors for type 2 diabetes, cardiovascular issues, and potentially some cancers. However, the mechanisms linking copper levels to cancer risk are still being studied, and the research is ongoing for potential cancer prevention. I will provide updates on new studies in this field.