Jameela Jamil shares the "horror story" behind why she hates fad diet products so much.

Jameela Jamil has gained a reputation as the unhelpful-bullsh*t police, ready to call out dangerous diet fads like slimming shakes and appetite suppressants.

And now The Good Place actress has revealed the reason she has waged war on these insidious weight-loss products: it’s personal.

The 32-year-old shared in a tweet that she had a “horror” experience with weight-loss products that can be bought over the internet as a teen.

“I used them as a teen and my digestive system, metabolism, thyroid and kidneys were damaged for over a decade,” she wrote.

“My mental health didn’t fare well either.”

Let’s start a thread of our horror stories about using weight loss products you buy over the internet. I’ll go first, I used them as a teen and my digestive system, metabolism, thyroid and kidneys were damaged for over a decade. My mental health didn’t fare well either. ???? pic.twitter.com/1MxmWKcEAk

— Jameela Jamil (@jameelajamil) January 2, 2019

Jameela shared her experience hoping to start a thread of “horror stories” about fad weight-loss products, which are often marketed to young women via Instagram.

Followers obliged, sharing awful run-ins with questionable products.

One woman described using appetite suppressants and something called “slimming mixture” that made her vomit.

She said, as a result, her weight is never stable and her metabolism and attitude towards her appearance are “f****d”.

Another shared her story of addiction to laxatives, which she still sees a therapist over.

I got addicted to laxatives for a short time and my metabolism got screwed and I suffered an eating disorder for years and I still struggle with body dysmorphic disorder… ALL because of some adult who made me feel worthless as a young child/teen. #stillneedtherapy

— Joey (@joeyadventures) January 2, 2019

Another woman shared a common experience of buying expensive products and quickly regaining the weight she lost.

Lost a couple of lbs before I gave up, then quickly regained those and more.
The tubs haunted me for months from the cupboard.

— Claire Allan ???????? (@ClaireAllan) January 2, 2019

Jameela has previously called out celebrities, like the Kardashians and Cardi B, who promote “detox teas” that merely act as laxatives.

“I hope all these celebrities all shit their pants in public, the way the poor women who buy this nonsense upon their recommendation do,” she wrote in a tweet.

She also lost it when Kim Kardashian shared an Instagram post promoting weight suppressant lollypops, describing her as a “terrible and toxic influence on young girls”.

But her targets are not limited celebrities – also calling out the publications that use photoshop to airbrush older women’s wrinkles out of existence, while keeping men’s intact.

Have you tried a fad diet product before? Let us know in the comments.