Eating healthy isn’t always easy, but committing to a healthy diet can be one of the smartest decisions you ever make. Why? Not only can eating well make you look and feel better, it can also save you money on future health costs.

But even if you intend to “eat healthy,” knowing exactly what that means can be challenging. “Following a healthy diet includes choosing plenty of lean meats, eggs, vegetables, fruit, whole grain and dairy products,” says Debra Ness...