All taxes are bullshit, so no, no fast-food tax should be implemented. The government shouldn't be involved in people's lives. Their job is to regulate laws, not to interfere in personal choices.

People who typically eat fast food regularly are those in poverty who can't afford anything better, so punishing them by forcing them to pay tax for food that they probably already struggle to afford just doesn't seem right. Not to mention that most places have a sales tax. So that would be an additional tax on top of an already bullshit tax.