Are all the articifial sweeteners safe?
Artificial sweeteners are low-calorie or calorie-free chemical substances that are used instead of sugar to sweeten foods and drinks.
They are found in thousands of products, from drinks, desserts and ready meals, to cakes, chewing gum and toothpaste.
Find out what the NHS evidence says on the safety of some of the most common sweeteners approved for use in the UK:
Both Cancer Research UK and the US National Cancer Institute have said sweeteners don't cause cancer.
"Large studies looking at people have now provided strong evidence that artificial sweeteners are safe for humans," states Cancer Research UK.
All sweeteners available for use in the EU must first undergo a very rigorous safety assessment. This is conducted by the European Food Safety Authority (EFSA), before they are alloowed to be used in any food and drink for human use.
As part of that trial and evaluation process, the EFSA sets a series of quantities called Acceptable Daily Intake (ADI). This is a maximum amount which tests have proved is safe to consume each day over the course of an average lifetime.
It's not necessary to keep track of how much of any particular sweetener products are being consumed each day, as everyone's eating habits are taken into consideration when specifying where the particular sweetener products can be used.
Are sweeteners healthy?
Sweeteners may be pronounced safe, but the question you need to ask is "are they healthy?" Food manufacturers claim sweeteners help prevent tooth decay, control blood sugar levels and reduce our calorie intake.
The EFSA has approved the health claims made about xylitol, sorbitol and sucralose, and many others, in relation to oral health and controlling blood sugar levels.
"Research into sweeteners shows they are perfectly safe to eat or drink on a daily basis as part of a healthy diet," says dietitian Emma Carder. She also says the products can be a useful alternative for people with diabetes who need to watch their blood sugar levels while still enjoying their favourite foods.
"Like sugar, most sweeteners provide a sweet taste but their biggest advantage and main difference is that, after consumption, they don't increase blood sugar levels," she says.
It has been suggested that the use of artificial sweeteners may have a stimulating effect on appetite and, therefore, may play a role in weight gain and obesity. Research into sweeteners however says otherwise. There is little evidence from longer-term studies to show that sweeteners lead to increased energy intake or are likely to contribute to the risk of obesity.