What Is Your Daily Sugar Habit Actually Doing to Your Body?

Sugar doesn’t usually announce itself as a problem. It becomes part of the routine, and over time, it is the routine that matters. From your teeth and metabolism to your overall health, the effects of excess free sugar are less about one indulgence and more about what happens repeatedly.

Most people don’t need to be told that cake, fruit juices and fizzy drinks contain sugar. The more important question is what happens when sugar becomes a regular feature of the way we eat.

Not because sugar is inherently “bad”, and not because one sweet treat can undo an otherwise healthy lifestyle. The body responds to our overall dietary patterns, and repeated exposure to excess free sugars can have consequences that extend beyond weight.

So, what is your daily sugar habit actually doing to your body?

It can quietly increase your overall energy intake

Sugar provides energy, but foods and drinks high in added or free sugars can increase the energy density of the diet without necessarily providing the same nutritional value as more nutrient-dense foods.

Over time, regularly consuming more energy than the body needs can contribute to unhealthy weight gain. This is where the conversation around sugar requires balance: weight is influenced by many factors, including overall diet, physical activity, genetics and lifestyle. Sugar is not the sole explanation for weight gain.

But repeated habits matter.

“The body doesn’t experience our diet as isolated meals,” says Mapholi. “It responds to what we consistently eat and drink over weeks, months and years. That’s why it is important to understand patterns rather than focus on one food.”

Your blood glucose responds, as it should

When we eat carbohydrates containing sugars, they are digested and absorbed, contributing glucose to the bloodstream. The body releases insulin to help move that glucose into cells, where it can be used for energy or stored. This is normal physiology.

The concern is not that eating sugar once “damages” your blood glucose. Metabolic health is influenced by a combination of factors, including overall dietary patterns, total carbohydrate intake, body weight, physical activity and genetics.

But understanding how much added sugar is regularly part of your diet can be useful, particularly for people who are trying to make more informed choices about their overall carbohydrate and energy intake.

Your teeth may feel the effects first

One of the clearest reasons to pay attention to frequent free-sugar intake is oral health.

The World Health Organization identifies free sugars as the most common risk factor for dental caries, or tooth decay. When bacteria in dental plaque metabolise sugar, they produce acids that gradually damage the hard tissues of the teeth.

This is where frequency becomes particularly important.

“The sugar conversation is often dominated by calories and weight,” says Mapholi. “But oral health is one of the strongest reasons to pay attention to how often free sugars are consumed. Your teeth are responding to repeated exposure too.”

The bigger picture is metabolic health

A dietary pattern high in free sugars can contribute to excessive energy intake and unhealthy weight gain. Excess weight is associated with an increased risk of several noncommunicable diseases.

WHO has also reported evidence linking high free-sugar intake with certain cardiovascular risk factors, including blood pressure and serum lipids.

That does not mean one food or ingredient independently causes heart disease. It means that dietary patterns matter, and that the choices we repeat are often more important than the occasional indulgence.

And what about your skin?

Sugar has become an easy target for dramatic claims about acne and ageing, but the science is more nuanced.

Some research suggests that high-glycaemic dietary patterns may worsen acne in some people. However, the evidence does not support the simplistic claim that sugar directly “causes” acne.

Nutrition rarely works that neatly. What we can say with greater confidence is that a balanced, nutrient-rich diet supports overall health, and reducing excessive free-sugar intake can form part of that approach.

The goal is awareness, not fear

Reducing sugar should not mean becoming afraid of food or believing that every sweet choice is unhealthy.

Are highly sweetened foods and drinks a daily default? Are there opportunities to reduce unnecessary added sugar? Are there realistic changes that can be sustained?

For people who want to reduce added sugar while still enjoying sweetness, low- or no-calorie sweeteners can be one option. WHO’s 2023 guidance is clear that these should not be positioned as a long-term solution for weight loss or disease prevention, nor as a substitute for an overall healthy diet. But a sweetener can still be a practical substitution for someone making a specific change to their sugar intake. Canderel is one such option.

“The goal isn’t perfection,” concludes Mapholi. “It’s understanding what your everyday choices are doing and deciding which changes make sense for you.”

Because when it comes to sugar, the most important question isn’t what you ate once.

It’s what your habits are doing over time.

By Mbali Mapholi, Canderel Partner Dietitian