If you get angry about things on the internet to the extent it ruins your day, you should probably stop reading now, because this will make you so wound up you'll need an industrial strength sports massage to undo it.

Some absolute [insert expletive] has/have set up an Instagram account called Project Harpoon, which describe itself as being "about reposting #thinnerbeauty." So far the account already has 281 too many followers, which it asks to "support the movement of being in shape and normal!"

The basis of the account is to feature pictures of so-called "plus-sized" women (with one token man posted today) and Photoshop them into skinny versions of themselves. Often to a worrying degree. One even involves splitting one woman in half to make two separate people.

The captions on some of the pictures are truly awful. One image of a model posing in a car park wearing a feminist t-shirt, says: "If you're a feminist, you should at least be in shape so you can attend the protests, not get stuck in the parking garage."

Another gorgeous picture of a model posing on a beach reads, "from manatee to mermaid," while a picture of a woman on the street is captioned: "Now this is a true looker in disguise. From double wide to a possible bride, being thin could do wonders."

But as hard as it might be to believe, the comments might not actually be the worst part of this account. The worrying thing is that it is calling itself a "feminist" account that encourages users to be "healthy". Hashtags include: "#fitchicks #chickswholift #crossfit #lifetimefitness #lafitness #weightlift #happierwhenskinny #feminism #feminist #girlpower #womensrights #healthy #eatright #gains".

The anonymous person behind the page responded to criticism in the comments by saying: "If I offend 1000 people but inspire 1 to lose weight and live a longer happier life then ya that's fine by me." But needless to say the page has been quite rightly flooded with responses about how dangerous this sort of behaviour is, in contributing to depression and low self-esteem in men and women of all shapes and sizes.

One writes: "Calling people 'fatties' is not inspiration. It is bullying. This account takes pictures from strangers and lowers their confidence. Ironically, 'lack of self confidence' is one of the negative side effects to obesity that this account listed above."

Another says: "I may not be the thinnest person ever, but I'm much happier with myself now than I would be in a skinnier body. Also, I think y'all are missing the point. This page isn't encouraging them to change, it's telling them that they're ugly and shouldn't be accepted by society because of their weight."

One user adds: "I'm all for accounts that encourage healthy living but this is not the way to do it. There's a difference between a health account and a hate account and this would be that difference."

"There are beautiful women killing themselves every day because of what you're doing and you glorify the fact that you have a page bullying people to promote that thin is prettier.. you made these women look anorexic which in ITSELF is unhealthy and a psychological illness... there isn't 1 post on here that promotes how to be healthy not one clean eating post... how about you show success stories to support your notion that thin is better or fitter as you so obviously put it?"

We have chosen not to republish the pictures of everyday women who have been featured. For some real body positivity, head here, here and here. Health doesn't come in one shape or size, it comes from loving your body and looking after it.

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Claire Hodgson Digital Editorial Director Claire Hodgson is the Editor of Cosmopolitan.com/UK, overseeing all things digital.

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