So, can Diet Coke actually cause cancer? A nutritionist explains everything you need to know

You'll likely have read a lot about Diet Coke and aspartame in the past few days. That's because Reuter's leaked a report suggesting that the World Health Organisation (WHO) is changing the way aspartame - the sweetener used in soft drinks - is classified. In short, the report suggests aspartame is moving up a level in how carcinogenic - or cancer-causing - it is. 

The news launched a thousand think pieces about whether or not your favourite sweetened beverage should be banned, whether the advice should be ignored and what this all means for our health. 

First - let's back up a little bit. Aspartame was approved for consumption in the 1980s and has since been one of the most common sweeteners in "diet" drinks. "Aspartame is approximately 200 times sweeter than sugar," explains Farzanah Nasser, a nutritional therapist and certified functional medicine practitioner. As such, you need seriously small amounts of it to sweeten your food and drink.

Not to mention, it's virtually zero calories. For a long time, low-calorie drinks have been deemed healthier than their full-sugar counterparts as we all learn about the risks of high-sugar diets and blood sugar spikes. But there's been a growing concern around ingredients like sweeteners and flavourings recently too, especially in regard to the lack of research on what these might do to your health long term.

So now the International Agency for Research on Cancer (IARC), run by WHO, has allegedly stated that aspartame is a possible carcinogen, alarm bells have started ringing across the Internet. 

Keep scrolling as qualified professionals share their honest take on just how bad these sweeteners really are for you. Don't miss what happened when one MC UK staffer tried TikTok's trending three drink theory, while you're here. 

Diet Coke and aspartame: your need-to-knows

Since aspartame was approved for consumption, there have been many studies showing that the use of it in food and drink is safe for consumption - a huge 2013 review found current levels of intake aren't harmful. However, there have also been ongoing concerns: another study from the 1990s suggested aspartame might be linked with brain cancer. 

Despite that, the IARC has always had aspartame down as a class 3 carcinogenic. This is the lowest class and simply means that there is less than sufficient evidence in animals and inadequate evidence in humans for it to cause cancer. For reference, other items in this group include fluorescent lighting and coffee. 

At the other end of the scale, items in class 1 have sufficient evidence of carcinogenicity in humans. Class 1 items include things like tobacco and alcohol.

According to reports from Reuters, aspartame will move up to be classed as a 2B carcinogen from mid-July, which the WHO shares there is "limited evidence of carcinogenicity in humans [and] less than sufficient evidence of carcinogenicity in experimental animals."

Again, for reference, other things currently rated in 2B include aloe vera, dry cleaning and HPV. 

It's a lot of terminology and jargon - so, what does all of this mean, exactly? "There is still limited evidence of a carcinogenic effect in humans, and aspartame was only shown to be cancer-causing when rats were given 200 times the dose that a human would drink," says Nasser. "The Joint FAO/WHO Expert Committee on Food Additives (JEFCA) have also reported that a 60kg adult would need twelve to 36 cans of diet coke every day to be at risk of cancer from aspartame consumption." 

So, should I stop drinking and eating sweeteners?

While it might take very, very high doses of soft drinks to lead to cancer risk, the fact this ingredient has any link to disease at all is off-putting for some people. 

You could swap to other sweeteners, such as sucralose or stevia. That said, if it's a Diet Coke you're pining after, then know that our expert confirms that the levels of aspartame found in any food and drink shouldn't be risky.

However, Nasser does recommend that you consider your options. Even if aspartame won't harm your health, she shares that it likely won't benefit it, either. Try and swap it out for something like Kombucha or sparkling water, both of which are proven to have health benefits. "Drinks like Kombucha contain probiotics for a positive effect on the gut and overall health," says Nasser. 

Bottom line? The absolute key is to not stress about what you consume. The most important thing to drive home is that the change in classification does not mean there's new evidence that aspartame causes cancer but simply that there's not no evidence that high doses can have an impact on our health. Being an empowered consumer is crucial to choosing what feels right for your health. 

Fancy a swap? Try a nutritionist-approved drink