Should fast food companies be held legally liable for the impact of their product on consumers?

Fast food places, everyone knows don't have the healthiest foods. In fact the food is fat food and if taken daily or often, it can harm the consumer. So by going there you alone are responsible for taking in the food. Of course the fast food places should at least try to make healthier food. Which I think should be a requirement, knowing that they get a lot of customers, they should make a healthier food menu to select from. Yet the consumer is you, so I guess fast food companies shouldn't be held legally liable for the impact of their product on the consumers.