Question

which practice can help prevent many diseases?
eating foods rich in gluten
getting blood transfusions
avoiding tobacco products
taking calcium supplements

Explanation:

• Eating foods rich in gluten can cause problems for people with celiac disease or gluten - sensitivity.
• Getting blood transfusions is a medical treatment for specific conditions (like severe blood loss) and is not a preventive measure for many diseases.
• Avoiding tobacco products is a well - known preventive measure. Tobacco use is linked to numerous diseases such as lung cancer, heart disease, and respiratory diseases.
• Taking calcium supplements is mainly for addressing calcium deficiency (e.g., in osteoporosis prevention in some cases) and is not a broad - spectrum disease - prevention practice like avoiding tobacco.

Answer:

C. avoiding tobacco products