How Much Sugar Is Really in Common Foods?
DOWNLOAD CHART HERE: SUGAR IN COMMON FOODS.
Sugar is easy to spot when it is sitting in a bowl.
It is much harder to recognise when it arrives disguised as a plate of rice, a baked potato or a slice of bread.
Most people know that biscuits, sweets and soft drinks contain sugar. What many people do not realise is that foods do not have to taste sweet to have a significant effect on blood glucose.
That is because much of the carbohydrate we eat comes from starch. During digestion, starch is broken down into glucose before it can be absorbed and used by the body.
So while you may not see sugar when you look at a bowl of rice, your digestive system sees something very different.
Your body does not read the front of the packet
Imagine eating three different things:
- A spoonful of table sugar
- A packet of biscuits
- A bowl of rice
To your eyes and tastebuds, these are completely different foods.
One is obviously sugar. One tastes sweet and crunchy. The other is a savoury staple eaten by billions of people.
Inside the digestive system, however, there is more overlap than most of us realise.
Table sugar, or sucrose, is made from glucose and fructose. The starch in foods such as rice, pasta, bread and potatoes is made from long chains of glucose molecules.
Digestive enzymes break those starch chains apart, releasing glucose that can then enter the bloodstream. The rate of digestion varies considerably between foods, with food structure, fibre, cooking and processing all influencing the glucose response.
That does not mean a bowl of rice and a soft drink are nutritionally identical.
They are not.
They can contain different nutrients, have different effects on fullness and be digested at different speeds. But both can supply carbohydrates that increase the amount of glucose entering the bloodstream.
That is the part we cannot see.
The sugar number can be misleading
Have you ever checked a nutrition panel, seen a low number beside “sugars” and assumed the product would have very little effect on your blood glucose?
It is an understandable mistake.
The “sugars” line tells you how much simple sugar is in the food. It does not tell you how much of the food’s starch will be broken down into glucose during digestion.
Consider rice.
Rice usually does not taste sweet. It may contain relatively little sugar according to the nutrition panel, but it can still contain a large quantity of digestible starch.
Your tongue says, “This isn’t sugar.”
Your digestive enzymes say, “Leave it with us.”
This is why it is important to look beyond the sugars number and consider the food’s total carbohydrate, fibre, portion size and likely glycaemic effect.
The teaspoon chart that makes the invisible visible
British GP Dr David Unwin became interested in finding a simpler way to explain this process to his patients.
Terms such as glycaemic index and glycaemic load are useful, but they are not exactly dinner-table conversation. Dr Unwin and his colleagues developed a visual tool that translated the expected blood glucose effect of common foods into an equivalent number of 4-gram teaspoons of table sugar.
The aim was not to suggest that the food literally contained that many spoonfuls of sugar. It was to make its potential glycaemic effect easier to picture. Dr Unwin’s research described this “teaspoons of sugar equivalent” approach as an aid for helping patients understand how different foods may affect blood glucose.
The chart supplied with this article gives the following comparisons:
| Common food | Serving size | Approximate blood glucose effect compared with 4 g teaspoons of table sugar |
|---|---|---|
| Basmati rice | 150 g | 10.1 teaspoons |
| Boiled white potato | 150 g | 9.1 teaspoons |
| Baked French fries | 150 g | 7.5 teaspoons |
| Boiled white spaghetti | 180 g | 6.6 teaspoons |
| Banana | 120 g | 5.7 teaspoons |
| Boiled sweetcorn | 80 g | 4.0 teaspoons |
| Small slice of wholemeal bread | 30 g | 3.0 teaspoons |
| Apple | 120 g | 2.3 teaspoons |
| Boiled peas | 80 g | 1.3 teaspoons |
| Broccoli | 80 g | 0.2 teaspoons |
| Eggs | 60 g | 0 teaspoons |
These figures appear in the supplied Sugar in Common Foods infographic on page one.
The Public Health Collaboration also makes Dr Unwin’s sugar infographics and other practical nutrition resources available through its resource library.
Wait, does a bowl of rice really contain ten teaspoons of sugar?
No. This is the most important distinction in the entire article.
A serving of basmati rice does not contain 10.1 teaspoons of added table sugar.
The figure is intended to compare the food’s estimated effect on blood glucose with the effect of consuming teaspoons of table sugar.
Think of it like comparing two cars by how quickly they reach 100 kilometres per hour. It does not mean the cars have the same engine, weight or design. It simply gives us a familiar way to compare one particular outcome.
The foods in the chart differ enormously in their nutrient content, fibre, structure and effect on fullness. The teaspoon measurement is an educational comparison, not a complete nutritional rating.
Why does the portion matter so much?
A single grain of rice is unlikely to cause much trouble.
A large bowl is another story.
The glycaemic index, commonly shortened to GI, measures how strongly the carbohydrate in a food raises blood glucose compared with a reference food.
But GI does not tell you how much carbohydrate you actually ate.
That is where glycaemic load becomes useful. Glycaemic load considers both:
- How quickly the carbohydrate is likely to raise blood glucose
- How much available carbohydrate is in the serving
The standard calculation is:
Glycaemic load = GI × available carbohydrate in the serving ÷ 100
A food can therefore have a high GI but a relatively low glycaemic load when only a small amount of carbohydrate is eaten.
The opposite is also true. A generous portion of a starchy food can produce a considerable glycaemic load, even though it contains very little labelled sugar.
This is why serving size matters. It is also why the tiny serving printed on a packet is not very helpful when you routinely eat two or three times that amount.
Biscuits bring sugar and starch to the same party
Biscuits are a particularly good example of why looking only at sugar can be misleading.
Many biscuits contain added sugar, so the sweetness is obvious. But they also contain flour, which supplies starch.
During digestion, the added sugar contributes simple carbohydrates while the refined starch can also be broken down into glucose.
In other words, the added sugar is not working alone.
The same principle applies to many crackers, pastries, breakfast cereals, snack bars and other packaged foods. The product may not appear extremely high in “sugars”, but its total carbohydrate content can tell a different story.
Not all carbohydrate foods behave the same way
This is not an argument that all carbohydrates are bad or that every carbohydrate-containing food should be avoided.
A lentil, a biscuit and a banana all contain carbohydrates, but they are not the same food.
Their effects can vary depending on:
- The amount eaten
- Fibre content
- Food structure
- Type of starch or sugar
- Cooking method
- Degree of processing
- Protein and fat eaten with the meal
- The person eating it
Individual glucose responses can also vary. Two people may eat the same food and experience different blood glucose changes.
What matters is understanding that “not sweet” does not automatically mean “no effect on blood glucose.”
What Dr David Unwin wanted patients to understand
Dr Unwin is a UK general practitioner who has used lower-carbohydrate dietary education with patients living with type 2 diabetes and prediabetes.
His teaspoon infographics became popular because they translated an invisible biochemical process into something people could instantly picture.
Rather than telling someone that a serving has a certain glycaemic load, you can show them a row of teaspoons.
Suddenly, the carbohydrate in a plate of rice or potatoes is no longer an abstract number.
Dr Unwin has also published results from his general practice, reporting improvements in weight and HbA1c among patients who chose to follow its lower-carbohydrate program. However, these results came from a real-world service evaluation rather than a large randomised controlled trial, which is an important limitation when interpreting the findings.
Broader research has found that lower-GI and lower-glycaemic-load eating patterns can produce modest improvements in measures of glycaemic control and other cardiometabolic markers among people with diabetes.
How to look at food differently
You do not need to become a biochemist every time you go grocery shopping.
A few simple questions can reveal far more than the word “sugar” alone:
What is the total carbohydrate?
The sugars figure is only one part of the carbohydrate story. Check total carbohydrate as well.
What is the actual portion?
A nutrition panel might describe one serving as three biscuits. That becomes fairly meaningless when half the packet disappears beside a cup of tea.
How much fibre does it contain?
Fibre is not digested into glucose in the same way as available starch and sugar. It can also affect fullness and the overall digestion of a meal.
Is the food heavily refined?
Grinding, puffing, flaking and other forms of processing can make some starches easier and faster to digest.
What are you eating with it?
A mixed meal containing protein, fat and fibre may produce a different response from eating the carbohydrate food by itself.
The message is not “fear all carbohydrates”
The message is understand what you are eating.
A piece of fruit is more than its sugar. It can also provide fibre, water, vitamins and plant compounds.
A potato is more than its starch.
A biscuit is more than the number printed beside “sugars.”
And a bowl of rice is not the same as a soft drink, even though both can ultimately deliver glucose-producing carbohydrates.
Food quality, nutrients, preparation and portion size all matter.
But when it comes to blood glucose, it is worth remembering that sweetness is not a reliable guide.
The sugar you can see and the glucose you cannot
Most of us would think twice before sitting down and eating ten teaspoons of sugar.
Very few people have the same reaction to a bowl of rice.
That is what makes Dr Unwin’s chart so powerful. It gives us a way to visualise what normally remains hidden inside the digestive system.
The carbohydrates in rice, bread, pasta, potatoes and biscuits do not simply disappear after we swallow them. Digestible starch is broken down, glucose is absorbed and blood glucose can rise.
You may not taste it.
You may not see it listed as sugar.
But your body still has to process it.
At Qetoe, we believe healthier eating begins with better understanding. Not fear, guilt or giving up the foods you love, but knowing what is in them, how portions matter and what happens after the food leaves your plate.
Because sometimes the most important sugar is the sugar you cannot see.
This article provides general information only and is not medical advice. People taking insulin or glucose-lowering medication should speak with their doctor or diabetes healthcare team before making a significant reduction in carbohydrate intake.
