The junk food companies are very aggressive marketers.
Their tactics can get unethical at times and they constantly market very unhealthy products as if they are health foods.
The food companies make misleading claims and they spend massive amounts of money sponsoring scientists and major health organizations to influence their research and guidelines.
In my opinion, the junk food companies are even worse than the tobacco companies ever were, because they target their marketing specifically towards children.
Children are becoming obese, diabetic and addicted to junk foods way before they’re old enough to make conscious decisions about these things.