I believe the conversation evolved past that nonsense to a point where the question became - cut the spending - that is the problem. But if you are still on sugary/fatty foods that makes some sense - but not as a tax as the government should not be involved in paying for misbehaviors of the citizenry - the individual citizens should be doing that.
Insurance makes that impossible. Whether you use Obamacare or the prior system, these poor individual behaviors are driving up costs for the entire citizenry, with the exception of the fortunate few wealthy enough not to need insurance.