When evaluating a public health claim that "tight glycemic control prevents all diabetes complications," which critique is most accurate?

• A. Tight glycemic control prevents complications only if achieved by dietary supplements rather than medications, which are ineffective in altering long-term outcomes.
• B. Tight glycemic control reduces risk of many microvascular complications (retinopathy, nephropathy, neuropathy) but does not eliminate all complications and can increase hypoglycemia risk; macrovascular outcomes are influenced by multiple factors beyond glycemia alone.
• C. Glycemic control has no relationship to any diabetes complications; complications are exclusively genetic and cannot be modified by treatment.
• D. Tight glycemic control always prevents all complications with zero risk of adverse effects, so aggressive insulin therapy is universally recommended for every person with diabetes regardless of age or comorbidity.

Answer: (B)