Even the wrappers for fast food are bad for you

Fast food wrappers contains chemicals that have recently been linked to slowing down metabolism. (iStock)

Even the wrappers at burger joints are fattening.

Fast-food wrappers contain chemicals known as perfluoroalkyl substances (PFASs for short) — and exposure to them appears to slow down the metabolism, according to new research out of Harvard’s School of Public Health.

Slow metabolism can lead to weight gain — and can also get in the way of weight loss.

PFASs are used in everything from clothing fabrics to cookware surfaces. In fast-food wrappers, they prevent leakage — say, to prevent grease from soaking through a fish fillet wrapper’s surface, making consumers all too aware of what they’re about to eat.

But according to the Daily Mail, “The chemicals can permeate into the food . . . and are then ingested and absorbed into the blood stream.”

Lead study researcher Qi Sun says that the study found a “clear link” between exposure to PFASs and sluggish metabolisms.

Also, the double-cheeseburgers inside the wrappers probably aren’t helping.

This article originally appeared on the New York Post.