The truth about sugar

Why is sugar bad for you, and what is the recommended daily allowance? We explain common hidden sources of sugar and easy ways to cut back on your intake.

Granulated sugar and sugar cubes in bowls

There is increasing research to suggest that it's the sugar rather than the fat in our diets that is the major contributing factor to our obesity epidemic. Nutritionist Kerry Torrens explains the 'hidden' sugar you may not know you're eating and how to spot it on food labels...

How much sugar should I be eating?

Sugar is a carbohydrate found naturally in a host of different foods, from lactose in milk to fructose in fruit and honey. There are two types of sugar: naturally occurring sugar (such as the lactose in milk) and added or 'free' sugars that include refined table sugar (sucrose) as well as concentrated sources like fruit juice, honey and syrups. Health organisations including the NHS advise we cut back on these 'free sugars'.

The new recommendations from the World Health Organisation (WHO) and the UK's official nutrition advisors are that only 5% of your daily calorie intake should consist of added, or 'free' sugars. This equates to approximately seven sugar cubes (30g). Children should have less – no more than 19g a day for children aged 4-6 years old (five sugar cubes), and no more than 24g (six sugar cubes) for children aged 7-10 years old.

Why is sugar bad for you?

If you're very active and exercise regularly some sugar in your diet helps supply ready energy to fuel your muscles and keep your brain active. The problem for the majority of us is that many of the processed foods we eat - in particular, those marketed to children - have added sugar that supplies energy in the form of calories, and very little else, so we end up consuming more than we need. A high intake of sugar causes our blood sugar levels to shoot up, giving us that feel-good 'high' followed by a crashing slump that leaves us tired, irritable and craving more sugary foods. It's a vicious cycle that may be contributing to our weight problems as well as health conditions like diabetes and heart disease.

In recognition of these issues, the government has released guidelines for the food industry to reduce the amount of sugar in packaged products.

A cupcake topped with chocolate icing which has been dropped on the floor

Hidden sources of sugar

The instant 'lift' we get from sugar is one of the reasons we turn to it at times of celebration, or when we crave comfort or reward. However, even those of us without a sweet tooth may be eating more than we realise because so many everyday processed foods, from cereals and bread to pasta sauce and soups, contain sugar.

  • 'Low-fat' and 'diet' foods often contain extra sugar to help improve their taste and palatability and to add bulk and texture in place of fat.
  • Even savoury foods, like ready-made soups and sauces may contain added sugar.
  • A can of soft drink, on average, contains the equivalent of seven teaspoons of sugar.
  • The natural sugar in some fruit, including apples, has increased as new varieties (including Pink Lady, Fuji and Jazz) are bred to satisfy our desire for greater sweetness.

Three cans of soft drinks surrounded by sugar cubes

Look on the label

Discover how much sugar is in your food by doing these simple checks:

  • Look at the 'carbs as sugars' on the nutrition panel. This includes both natural and added sugars. Less than 5g per 100g is low, more than 22.5g per 100g is high.
  • Check the ingredients list for anything ending in 'ose' (glucose, sucrose, fructose, lactose, maltose). These are all forms of sugar, as are honey, agave, molasses and syrups like corn and rice syrup. The higher up the ingredients list these are, the more sugar the product contains.
  • Know your substitute. For example, xylitol, sorbitol and mannitol. These occur naturally in small amounts in plants and fruits and are often used in low-calorie products to provide sweetness but with fewer calories. Xylitol can be used in home baking as a replacement for regular sugar (ratio 1:1) although your bakes won't brown as much and xylitol can't be used where yeast is the raising agent.

Food nutrition labels with a magnifying glass and calculator

Ways to cut down on sugar

Making a few adjustments to your diet can help you cut down on unnecessary sugar consumption:

  • Reduce the sugar you add to hot drinks. Do so gradually to give your tastebuds time to adjust. Try adding a sprinkle of cinnamon to cappuccino or hot chocolate. Cinnamon has several health benefits and adds flavour without the sweetness.
  • Avoid low-fat 'diet' foods which tend to be high in sugars. Instead have smaller portions of the regular versions.
  • Be wary of 'sugar-free' foods. These often contain artificial sweeteners like sucralose, saccharin and aspartame. Although these taste sweet, research suggests that they don't help curb a sweet tooth so they tend to send confusing messages to the brain and that can lead to over-eating.
  • Balance your carb intake with lean protein like fish, chicken and turkey. Protein foods slow stomach emptying which helps manage cravings. Try our tuna, asparagus & white bean salad.
  • Swap white bread, rice and pasta for wholegrain versions like oats, granary and wholemeal breads, brown rice and pasta. Try our mixed seed bread.
  • Reduce the sugar in recipes and add spices to boost flavour and taste. Try our spiced apple pie.
  • Stick to one glass of fruit juice a day (dilute it and enjoy with a meal to protect your teeth) and keep sweet soft drinks and alcohol for the weekends. Enjoy herbal teas or water with slices of citrus fruits for flavouring. Learn more about the health benefits of lemon water.
  • For a pick-me-up, have a piece of whole fruit with a handful of nuts or a small tub of plain yogurt. Both contain protein which helps balance blood sugar and energy levels. Try our cinnamon cashew spread with apple slices, or our berry yogurt pots.

Useful resources for cutting down on sugar:

Davina McCall: How to be sugar-free
Our favourite lower sugar recipes
BBC Good Food's guide to sugar-free baking

Like this? Now read...

10 things you should know before giving up sugar
All you need to know about sugar
More health & nutrition tips

This article was last reviewed on 5th December 2018 by nutritionist Kerry Torrens.

Kerry Torrens is a qualified Nutritionist (MBANT) with a post graduate diploma in Personalised Nutrition & Nutritional Therapy. She is a member of the British Association for Nutrition and Lifestyle Medicine (BANT) and a member of the Guild of Food Writers. Over the last 15 years she has been a contributing author to a number of nutritional and cookery publications including BBC Good Food.

All health content on is provided for general information only, and should not be treated as a substitute for the medical advice of your own doctor or any other health care professional. If you have any concerns about your general health, you should contact  your local health care provider. See our website terms and conditions for more information.

Whether you're looking for sweet substitutes, sugar-free baking guides or simply want to find out your recommended daily amounts, find all the answers in our sugar hub.

Comments, questions and tips

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25th Mar, 2019
I agree that sugar can cause many negative effects within the body. Almost every part of the human body is affected by sugar overtime if you consume too much of it. According to Web MD, “people who eat a lot of added sugar (where at least 25% of their calories comes from added sugar) are twice as likely to die of heart disease as those whose diets include less than 10% of total calories from added sugar” (“How Does Too Much Sugar Affect Your Body”). That is why it is so important to know how to avoid it, this article really highlights some important points to help someone stay away from sugar. Last year, my mom got me really into becoming more cautious about how much sugar I am consuming on a daily basis. She has been living a Keto lifestyle for the past year or so, which does not allow for her to consume any carbohydrates or sugars. Seeing her avoid sugar for so long and seeing her results was so inspiring that I also decided to avoid sugar. I indulge every now and then, but I consume much less sugar than I used to. The most important point from this article would probably be recognizing hidden sugar, many people think to only avoid soda and sugary treats when avoiding sugar, but there is so much more to it.
Brodie Morris's picture
Brodie Morris
11th Sep, 2018
Brendyn Houchens's picture
Brendyn Houchens
7th Mar, 2018
I think sugar is good for you. LOL!
Christinapolly's picture
7th Mar, 2016
Thanks For Sharing Nice Post. About exercise tips for sugar. Manipur Board 10th Class Result 2016 Manipur Board 12th Result 2016
25th Aug, 2015
When I was a small child I always had a glass of milk at bedtime AFTER cleaning my teeth. My dentist attributed that to my need for so many fillings by the time I was 20. Back in the 60's we were blissfully unaware that milk has about half as much sugar/lactose as a fizzy drink.
22nd Jul, 2015
Many of our customers at Total Diet Food like to know their exact macronutrient ratios, so we provide them a tailored meal plan delivered to their doorstep. We calculate their calorie level and their daily needs in fat, protein and carb intake.
27th Apr, 2015
Unfortunately it is quite UNTRUE to say honey sugars cannot be converted to fats. While many people enjoy the flavour of replacing sugar with honey in recipes there is little or no health benefit - the belief that honey contains significant amounts of vitamins is also untrue.
22nd Mar, 2015
Excuse me but Honey is not converted to fat in the body. Body does not know how to convert it to fat. So substitution sugar to honey is on some occasions definetly a good alternative beside more vitamins/minerals.
17th Aug, 2015
Hate to disillusion you, but honey, and in fact all sugars, are the exactly just what is converted to fat. The body knows precisely how to do it, in fact, that is what triglycerides are, fats that originated as carbohydrate. Unlike most of the 'debate' on this subject, there is no debate here. You are mistaken. Honey is sugar, and thus makes you fat. It is slightly better than sugar as you know it, because it has water and some micronutrients, but in the end, honey=sugar=fat.
19th Mar, 2015
It doesn't really matter if you feed yourself sugar or starch or if the sugar comes from fizzy drinks, juice or fruit it will all be converted to glucose and raise your insulin. A high insulin will make you body stop burning fat and instead store it. Also starchy food like bread, pasta, potatoes and rice will turn into glucose. The body doesn't need carbohydrates to function, yes it would need a little glucose for red blood cells and a small amount to the brain, but this can be made from protein and fat. For energy the body can use ketone bodies made from fat, actually both the heart and the brain prefer this fuel.


Brodie Morris's picture
Brodie Morris
11th Sep, 2018
how do i eat more sugar?
Brendyn Houchens's picture
Brendyn Houchens
7th Mar, 2018
is sugar good for you??
goodfoodteam's picture
8th Mar, 2018
We've highlighted some of the current research and thinking above but you can also find additional information in the features listed at the bottom or the article.
30th Jan, 2016
interested in the bowl of bran flakes having 3 tea spoons of sugar I just bought some bran flakes - hey claim 30% less sugar now and say a 30g portion has 4g sugar (=1 teaspoon) - so not 3 teaspoons - is this difference because a) the 30% less sugar in the product is since the "truth about sugar" was made and b) 30g is a small portion compared to that on the show ?
12th Sep, 2015
I have just watched the BBC documentary The Truth about Sugar and was wondering if you could post the low sugar sweet and sour sauce recipe. thanks.
27th Mar, 2015
Where can I find the pineapple sweetened sauce recipe to be used with chicken/prawns please?
3rd Jul, 2014
"only 5% of your daily calorie intake should consist of added, or 'free' sugars. This equates to ...35g for men." But 20 x 35 = 700 cals, whereas mens ideal daily calorie total is c 2700? What am I missing?
Kerry Torrens's picture
Kerry Torrens
14th Jul, 2014
Hi there, thanks for your question. We have all become familiar with the Guideline Daily Amounts (GDAs) – for an average man the GDA for calorie intake is 2500 calories per day, so 5% of this equates to 125 calories or in sugar terms 35g of sugar (about 7-8 tsp). 1 teaspoon = 16 calories Over the next few months you’ll increasingly see the GDAs being replaced with Reference Intakes – the figures for which have been streamlined so they now refer to just one set of figures rather than the male and female figures you’ve been seeing.
11th Jun, 2015
Looking on the label for 'ose (fructose, lactose, glucose etc) is time consuming if you are trying to wizz around the supermarket. I was so fed up struggling to work out how much sugar is in the food that I buy that I decided to do something about it. I have spent over a year putting together a free information tool that allows us consumers to dig deeper behind those food labels. The food manufacturers may object, but consumers will be slightly better informed, you'll find it at (if you like it, spread the word, if you don't, leave a comment and let me know how it can be improved)