If you're looking to lose weight, a fad diet can be incredibly seductive. Couching their claims in scientific-sounding terms like "ketogenic" and "toxins," some of the most popular methods promise immediate, lasting results. But is there really evidence that these things work?

No. The answer is no.

Check out the video below from ASAP Science for the science—and pseudoscience—behind some of the biggest diet trends out there today. You’ll learn why “cleanses” can turn your tongue white, what the Atkins diet can do to your digestion, and why "going paleo" can give you especially odiferous farts.

And hey—while the diet industry would love for us to think otherwise, body weight is not the be-all, end-all of health or happiness. Every body is different, from the way it processes food to the way it fills out a bathing suit, and no body is wrong. Studies have also found that weight is a pretty poor indicator of health. If it’s better fitness you’re after, talk to your doctor about small, sustainable changes you can make to your eating and exercise habits.