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No, you are not obligated, this is completely optional. I understand that some people collect this type of data to sell it. I don't know if this is legal or not, but more than one person does this for this very reason.
As an eCommerce business in the health niche, you may be required to collect customer health data depending on your services and location. However, this comes with strict regulations (e.g., HIPAA in the U.S.) to ensure data protection and privacy. Always check the legal requirements in your region and industry to ensure compliance.