Should fast food companies be held responsible for the obesity problem in the US?

This is just my opinion, there is no factual answer Yeah they should because 1. many people are getting obese (fat) from eating too many unhealthy fast foods and the fat in them is causing many diseases and has even been remotely linked with certain cancers, and 2. because there are many products (like muesli bars) that claim to be healthy but are actually full of sugar and fat and preservatives that aren't good for you, and that can trick many people into buying them BELIEVING that they are healthy when they really aren't.