Here are my predictions for the top six health trends you'll be seeing in 2020. But first, a look back at the top health trends for 2019, which included:

Year in, year out, people diet. A lot of people—that number is estimated to be 45 million. And since we're talking numbers, Americans invest about $33 billion each year on weight-loss products.

Am I stressed, anxious or both? These words are used interchangeably but there is a difference between them. It's worth figuring out which affects you because resolving anxiety requires a different approach than resolving stress does.

"Our temperature's not what people think it is," said senior study author Dr. Julie Parsonnet, a professor of medicine, health research and policy at Stanford University.