Are you a huge fan of coffee? You might want to look away now.

Dr Karan Raj, who racks up millions of views on Tik Tok with his informative videos, issued a gross warning for people who drink coffee - and it involves cockroaches.

In a clip that has racked up 1.5 million views, the doctor decided to drop the bombshell that if you drink pre-ground coffee, there's a high chance you're also gulping in some of the crushed up insects.

The revelation has shocked coffee lovers - and some have sworn off the hot drink as a result.

He explained: "Pre-ground coffee, like you get in most stores, contain ground-up cockroaches. A certain percentage of coffee beans become infested with cockroaches and other insects.

Dr Karan Raj issued a gross warning for people who drink coffee

"Usually they can't be processed out completely, so they just get roasted and ground up with the coffee beans.

"Most food authorities allow for a certain percentage of bug parts in our food."

He tried to add reassurance and said: "Cockroaches are high in protein", before warning: "If you're allergic to cockroaches, I'd stay away from pre-ground coffee."

The theory has been backed up by University of Montana biology professor Douglas Emlen, one of his old professors became badly allergic to cockroaches from handling them so often while studying insects and their relationships with humans.

He couldn't touch a cockroach without getting a reaction and found he suffered similarly when he drank coffee made from pre-ground beans.

When looking into the reason why, he found pre-ground coffee is all processed from huge stock piles, which are near-impossible to protect from cockroach infestation.

The gross warning involves cockroaches

He even claimed that back in 2009, defect standards in the US allowed coffee beans to contain as much as 10 per cent 'insect filth and insects'.

Dr Raj's revelation was enough to make to his viewer's skin crawl, as one commented to say: "I could have gone my WHOLE LIFE without knowing this."

A second wrote: "You're telling me I have been drinking the very thing I am terrified of my entire life!?"

A third replied: "Okay dude some information you do not need to tell us we are all coffee drinkers how dare you ruin our coffee in the morning."

But not everyone was put off, as another added: "Nice try. But I'm still drinking it."