Giving up sugar for 30 days has become a popular health challenge, but there is an important distinction that is often missed: stopping added or free sugars is not the same as eliminating every source of sugar from your diet.
Natural sugars found inside whole fruits and vegetables are not treated the same way as the free sugars found in table sugar, honey, syrups, fruit juices and many processed foods. The World Health Organization recommends keeping free sugars below 10% of daily energy intake, with a reduction to below 5% potentially providing additional health benefits.
So what could happen if you dramatically reduce added and free sugars for an entire month?
For someone who regularly consumes sugary drinks, sweets, cakes, biscuits and other heavily sweetened foods, one of the first changes may simply be a reduction in overall calorie intake.
Sugar itself is not automatically responsible for weight gain, but foods and drinks high in free or added sugars can provide substantial calories. Consistently reducing them can therefore make it easier for some people to reduce their overall energy intake and manage their weight. The CDC notes that excessive added-sugar consumption can contribute to weight gain and obesity and is associated with health problems including type 2 diabetes and heart disease.
You may also notice that your diet becomes less dominated by sweet foods.
A person who previously started the morning with heavily sweetened tea, consumed soft drinks during the day and regularly ate sweets or pastries may discover that cutting these products forces them to look for other options.
That can create an opportunity to eat more whole foods such as vegetables, fruits, pulses, whole grains and other minimally processed foods. WHO identifies these types of foods as important foundations of a healthy diet.
Another possible benefit is better dental health over the longer term.
Free sugars are a major contributor to tooth decay, and reducing their consumption is one of the dietary measures recommended to reduce the risk of dental caries.
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However, a 30-day sugar-free challenge should not be presented as a miracle detox.
Your body does not need a special 30-day sugar detox to “remove toxins.” The liver, kidneys and other body systems already perform the processes involved in removing waste and maintaining the body’s internal balance.
There is also no scientific rule saying that everyone will lose a specific amount of weight after 30 days without sugar.
The result depends on what a person was eating before the change and what replaces the sugary foods.
If someone stops drinking sugary soda but replaces it with large quantities of other high-calorie foods, their weight may not change much.
Similarly, removing sugar while eating an otherwise poorly balanced diet does not automatically create a healthy diet.
The first days of a major dietary change can also be challenging. Someone accustomed to very sweet foods may find unsweetened drinks or foods less appealing at first. Rather than attempting to eliminate every carbohydrate, nutrition guidance generally focuses on improving carbohydrate quality and choosing whole grains, vegetables, fruits and pulses.
And there is another important point: you do not need to stop eating fruit.
WHO distinguishes free sugars from the sugars naturally present within whole fresh fruits and vegetables. Its recommendations on free sugars are not aimed at eliminating the naturally occurring sugars in whole fruits and vegetables.
That means a healthier 30-day challenge could involve reducing sugary drinks, sweets, cakes, biscuits and other foods with large amounts of added or free sugars while continuing to eat nutritious whole foods.
Some people may also be tempted to replace sugar with artificial or non-sugar sweeteners. WHO’s guidance says non-sugar sweeteners should not be relied upon as a long-term strategy for controlling body weight, and recommends reducing overall sweetness in the diet instead.
After 30 days, the biggest lesson may therefore not be that sugar is something that must never be eaten again.
It may be that many people consume more free sugar than they realise.
Sugar can appear in soft drinks, flavoured beverages, sweetened cereals, sauces, desserts, packaged snacks and other processed foods. WHO notes that a significant amount of sugar can be hidden in foods and drinks that people may not think of as sweets.
A month of cutting back can therefore be useful as an experiment: check how much sugar you normally consume, identify where most of it comes from, reduce the biggest sources and replace them with more nutritious foods and unsweetened drinks.
The goal should not be to fear sugar.
The goal is to understand how much you are consuming and make choices that support a balanced diet.
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