What the science says about every popular diet - and whether they can work for you

There are so many diets out there, but figuring out which one will actually work for you can be tough.

Luckily, scientists have found that $4, compared to not following a diet at all. Overall, studies have shown that $4 for weight loss.

But many popular diets aren't based on sound scientific principles.

If you're setting a New Year's resolution to lose weight in 2017, here's what the science says about 15 popular diets, so you can decide which one - if any - might be right for you.