Too much sugar can make us overweight and this can lead to a plethora of health issues such as cancer, type 2 diabetes and heart disease.
Sugar also damages our teeth and nearly a third of UK adults and nearly half of teenagers have some level of tooth decay.
But sugar in food is increasingly hidden behind sweet-sounding aliases and confusing labelling, making it harder to spot and avoid.
Here are four ways sugar can fool you and how to root it out in your everyday food:
There's a dizzying array of ways you'll see sugar labelled these days.
Some are not easy to identify as sugar, such as hydrolysed starch.
Others have quite innocuous sounding names, such as coconut blossom nectar, grape sugar and oat syrup.
Dextrose is a sugar produced from corn, levulose is essentially another name for fructose (fruit sugar), and molasses is a by-product of the sugar-making process.
There's a health halo surrounding certain sugars, such as agave, coconut blossom nectar and date syrup. These are often found in foods that we may perceive as healthier options, such as protein balls or energy bars.
But while it's true that some of these sugars may slightly differ in their nutrient make-up, colour or taste, it doesn't matter if the label says nectar or syrup, refined or unrefined, brown or white. If it's a sugar (regardless of whether it's in the name or not), it will be made up of glucose or fructose molecules (or a combination), and will act on the body in the same way.
This applies to honey, too.
It is true that some sugars, for example date or coconut sugar, contain small amounts of nutrients such as calcium, iron or fibre. But sugar is not considered a useful source of these. To get them in any significant quantity, you would have to consume an unhealthy amount.
Once you've managed to negotiate your way through the minefield of sugars in disguise, trying to tot up your sugar total and stick within recommended guidelines is your next hurdle.
Food labels currently reflect EU legislation, which sets a guidance limit of 90g total sugars a day for an adult. But a 2015 Scientific Advisory Committee on Nutrition (SACN) report marked an important change in the way sugar is defined, and the focus is now on 'free sugars'.
The latest National Diet and Nutrition survey found that we eat between two and three times the recommended maximum of free sugars. But knowing how much you are consuming can be confusing, as intrinsic and free sugars aren't separated from total sugars on labels.
The means that an Innocent Smoothie Pomegranate Magic (250ml), which, while full of crushed and pressed fruit and one of your five a day, has 33g of sugar which is 110% of your daily free sugar allowance.
Public Health England recommends people should only be having one 150ml glass of smoothie or fruit juice a day because of fruit's free sugar content when blended or crushed.
Foods can be labelled 'no added sugar' or 'naturally occurring sugars' even though they contain free sugars from fruit juice, puree or paste.
In our research we discovered a Kellogg's Cocoa and Hazelnut Granola labelled 'no added sugar' even though date paste had been added and the cereal contains 13g of sugar per 100g.
Kellogg's told us the date paste 'is used to bind the grains together so the clusters in the granola don't fall apart - not to sweeten.'
As the date paste wasn't added to sweeten, the granola can carry the 'no added sugar' label.