Does Your Employer Have the Right to Tell You What You Should Eat?

One of my friends works for a company (which shall remain nameless) that recently swapped out the traditional vending machine filled with pop, chips, cookies and other non-healthy food and replaced it with machines that only have healthy food.

Yep, that's right. No more Twinkies or Pringles. No more Coca-Cola or M&M's.

The company would like the employees to be healthier. My friend's bosses think this will increase productivity, which will result in more revenue.

My friend thinks that the company has no right to tell employees what to eat. He's happy eating Ding Dongs and drinking coffee all day.

Does a company have a right to tell you what you can and can't eat?