A RESTAURANT has sparked backlash after offering discounts to skinnier customers.

The diner in Thailand was accused of “fat shaming” as it had a blunt method for examining who would be eligible for offer.

In a blow to bigger eaters, Chiang Mai Breakfast World, an all-day breakfast cafe, offered the discounts to customers who could complete a bizarre task.

The cafe set up multiple prison bar-like poles, each a different length apart, and challenged visitors to fit through the gaps.

And the smaller the gap was, the bigger the discount.

The smallest gap, which appeared to be about about a foot wide, presented a generous 20 per cent discount to those who were able to squeeze through.

While the widest gap between bars had text above it which read: “Full price. Sorry.”

This meant that larger customers, who could only fit through the biggest gap, were not eligible for a reduced price.

Footage of the diabolical challenge was posted online, before it sparked fury from offended viewers.

The footage in the clip shows multicoloured “skinny discount” bars which a man can be seen trying to fit through.

There are a total of five categories, which range from 20 per cent off for the tiniest gap, to 10 per cent at the medium slots, and finally to full price at the largest hole.

The man in the video is seen flexing his torso through the gate-like structure in an attempt to receive a 15 per cent discount.

Onlookers laugh out loud while one person quips: “You need some butter.”

The same struggling diner then attempts to go through the slightly bigger 10 per cent gap – but still fails this one.

The challenger finally manages to thread the 5% discount slot, admitting, “It’s better than nothing, I suppose”.

In a follow-up clip, a female diner can be seen passing through the 15 per cent space twice.

One of her male pals jokes: “I didn’t think your boobs were gonna get through there.”

Outraged viewers ripped the “skinny body, skinny bill” rule as prejudiced against plus-sized customers.

One critic wrote: “Wouldn’t eat there. That’s really discriminating.”

Another furious user said: “This is so wrong.

One viewer said that the practise could lead to eating disorders.

They said: “What’s wrong with you? This can promote eating disorders. Let people enjoy their food and have a healthy weight.”

But some seemed to like the idea, deeming it “funny”, with some calling it a “brilliant” idea.

One fan of the concept said: “We need this across all places.”

The Cafe’s website makes no mention of the challenge, but boasts a “huge choice of brekkie options” with “30 different types of jam”.

The eatery serves European and Thai meals and is run by a German chef.