For years, sugar has been at the center of debates about health. Some consider it one of the main causes of modern lifestyle diseases, while others emphasize that it is a natural source of energy essential for the proper functioning of the body. As is often the case in medicine, the answer is not black and white. Instead of relying on myths and opinions found online, it is worth examining what scientific research actually shows. Does sugar really increase the risk of disease? How does it affect body weight, metabolism, cardiovascular health, and mental well-being? And is all sugar the same?
Sugars are one of the body’s fundamental nutrients and occur naturally in many foods. Glucose serves as the primary source of energy for the body, and under normal physiological conditions, the brain uses it as its main fuel. Therefore, the issue is not the presence of sugar itself in the diet but rather its excessive consumption, particularly in the form of added sugars found in sweetened beverages, confectionery, and highly processed foods.
The impact of sugar on health is among the most extensively studied topics in nutrition science. One of the most frequently cited analyses is a meta-analysis published in The BMJ in 2013. Researchers reviewed the results of dozens of clinical studies and observed that higher consumption of added sugars was associated with increased body weight. At the same time, individuals who reduced their intake of added sugars experienced weight loss even without making other significant dietary changes. These findings suggest that excessive sugar consumption may be one of the factors contributing to overweight and obesity.
Particular attention has been given to sugar-sweetened beverages. Unlike solid foods, they provide large amounts of calories without producing the same feeling of fullness. As a result, the body receives more energy than it actually needs. This is why sugary drinks are considered one of the most important dietary factors associated with the development of obesity.
However, the consequences of excessive sugar intake extend beyond body weight alone. In a study published in Diabetes Care, Malik and colleagues demonstrated that regular consumption of sugar-sweetened beverages was associated with a higher risk of developing type 2 diabetes and metabolic syndrome. Researchers observed that individuals who consumed such beverages frequently were more likely to experience disturbances in glucose metabolism compared with those who consumed them only occasionally.
An increasing number of studies also point to a relationship between sugar consumption and cardiovascular health. A study published in JAMA Internal Medicine analyzed data from thousands of American adults. The results showed that individuals whose added sugar intake exceeded 20% of their daily caloric intake had a significantly higher risk of death from cardiovascular disease. The authors noted that the effects of sugar extend beyond weight gain and may also involve adverse metabolic changes and lipid abnormalities.
In recent years, the relationship between diet and mental health has also received growing attention. One particularly noteworthy study is the Whitehall II study, published in Scientific Reports. Researchers followed participants for many years and found that men who consumed the highest amounts of sugar were more likely to develop mood disorders during the follow-up period. Although the findings do not prove that sugar directly causes depression, they suggest a potential link between dietary habits and mental health.
Sugar is also frequently discussed in the context of addiction. Foods rich in sugar activate the brain’s reward system and stimulate the release of dopamine, a neurotransmitter associated with pleasure and reward. However, this does not mean that sugar is classified as an addictive substance in the same way as nicotine or alcohol. Current evidence suggests a more complex interaction involving taste preferences, emotions, eating habits, and the functioning of the reward system.
It is also important to remember that not all sources of sugar are the same. Fruits contain naturally occurring sugars, but they also provide fiber, vitamins, minerals, and numerous bioactive compounds. For this reason, they are not viewed in the same way as sugar-sweetened beverages or highly processed foods. Current health recommendations focus primarily on limiting added sugars rather than naturally occurring sugars found in whole foods.
The World Health Organization recommends that free sugars account for less than 10% of daily energy intake, with additional health benefits potentially achieved by reducing intake below 5%. For most adults, this corresponds to approximately 25 grams of sugar per day, or about six teaspoons.
In summary, current scientific evidence does not indicate that sugar is a “poison” that must be completely avoided. At the same time, a growing body of research confirms that excessive sugar consumption may increase the risk of obesity, type 2 diabetes, cardiovascular disease, and certain mental health problems. The greatest impact on health comes not from an individual food item or an occasional dessert, but from dietary habits that are built and maintained over many years.
Patient FAQ
Is honey healthier than sugar?
Honey contains small amounts of biologically active compounds, but it remains a source of simple sugars.
Where is the most hidden sugar found?
In sugar-sweetened beverages, flavored yogurts, breakfast cereals, ready-made sauces, and many highly processed foods.
Does a sudden craving for sweets mean that the body is deficient in sugar?
Not necessarily. Cravings for sweet foods may result from eating habits, fatigue, stress, lack of sleep, or irregular meal patterns.
Can physically active people consume more sugar?
People with higher energy expenditure generally require more carbohydrates. However, it is still advisable to limit added sugars and prioritize nutrient-dense sources of energy.
Does sugar affect skin aging?
Some studies suggest that excessive sugar intake may accelerate protein glycation, a process that is considered one of the mechanisms involved in skin aging.
