Scientists reveal the real reason why McDonald's actually tastes better outside the US

Experts have revealed why McDonald's tastes better when you have it outside of the US.

It might be one of the most quintessential US exports, but many people have observed that their favourite fast food tastes better away from its country of origin.

McDonald's is a huge business, with only a handful of countries not hosting the restaurants.

The chain's arrival in Russia was a seen as a sign of better relations after the collapse of the Soviet Union, though its departure after Vladimir Putin's invasion of Ukraine a sign that relations are once again cooling.

And not only is it in most countries, but the chain is also remarkably versatile in adapting its offerings to the cuisine of the country.

For example, in India there are a wider range of veggie options such as an aloo tikki burger or a butter paneer burger.

Meanwhile in Italy, you can get a 'My Selection Parmigiano Reggiano & Salsa alla Pera'.

If that's not already giving you a clue to a non-scientific reason why McDonald's tastes better outside the US, then fair, but that's not it.

McDonald's has some different menu items in India (EyesWideOpen/Getty Images)

There is actually another broader reason other than just having delicious regional menu options.

One reason, which has been suggested by scientists is the quality of the ingredients, and one ingredient in particular.

That's one which features a lot in McDonald's - sugar.

In Europe, most countries use cane sugar, while in the US the go to is high-fructose corn syrup.

The difference between these can influence the flavour of a lot of popular menu items at McDonald's, including everything from the burger sauces and condiments to the Coke.

There are some scientific reasons why McDonald's tastes better outside the US (Nano Calvo/VW PICS/Universal Images Group via Getty Images)

There is also the number of additives and preservatives which are permitted in the US, but not in other parts of the world.

Nutritionist Dr Renee Exelbert told the Daily Mail: "It is likely because the United States allows additives and preservatives into our food that other countries do not.

"These substances make the food taste different."

For example, in the UK many restaurants use rapeseed oil for their deep frying, which lends a nutty and smoky flavour to french fries.

In the US, however, the oil of choice is canola oil, which makes the fries taste sweeter.

There's also things like the beef which is used in the patties, which in the US supply chain can change hands four or five times between the farm and when it's served.

So, there you have it.