Discuss If It Is Unethical To Sell An Unhealthy Product

For example, discuss if it is unethical to sell an unhealthy product (high sugar, high fat, high calories)? 

Is it unethical to sell products that are high in sugar or high in fat and or high in calories?

Discuss your opinion related to heart disease, diabetes, and obesity?

I would classify the sale and marketing of Tastykake products as unethical but legal. Why?