Dante Carrillo
Sugar is a form of carbohydrate that the body converts to glucose, which provides energy. While sugar occurs naturally in many foods, such as fruits and vegetables, added sugars are sugars in foods that are not naturally occurring. These added sugars are extra calories with no extra nutrition and can lead to weight gain and other health problems. Excess sugar consumption can cause many conditions, including diabetes, obesity, heart disease, high blood pressure, liver disease, and tooth decay.
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What You'll Learn
Sugar and tooth decay
Sugar is one of the main causes of tooth decay. Tooth decay, or dental caries, occurs when acid from within the mouth attacks the enamel and dentine of the teeth, creating holes or cavities. The acid is produced by bacteria found in plaque, a thin film that forms over the teeth. When sugar is consumed, it interacts with the bacteria within the plaque to produce acid. This acid is responsible for tooth decay because it slowly dissolves the enamel, creating holes or cavities in the teeth.
Dental caries is the most common cause of tooth loss in young people and the most common noncommunicable disease worldwide. It is also the most prevalent condition included in the 2015 Global Burden of Disease Study, ranking first for decay of permanent teeth (2.3 billion people) and 12th for deciduous teeth (560 million children). Almost half of the world's population is affected by dental caries, making it the most prevalent of all health conditions. High levels of dental caries occur in middle-income countries, where sugar consumption is high.
The World Health Organization (WHO) suggests that there is a direct relationship between the amount of sugar one consumes and the risk of cavity development. They recommend limiting sugars to less than 10% of your total dietary intake and aiming for 5%. Limiting sugar is a positive step in improving overall health and is vital when it comes to preventing tooth decay. Sugar is a food source for plaque bacteria in our mouths and contributes to enamel erosion and tooth demineralization; the first stage of tooth decay. Over time, this decay progresses and breaks through the enamel to cause cavities.
To prevent tooth decay, reduce the amount of food and drinks containing free sugars, such as sweets, chocolates, cakes, biscuits, sugary breakfast cereals, jams, honey, fruit smoothies, dried fruit, and sugary drinks. Sugars found naturally in fruit and vegetables are less likely to cause tooth decay because they are contained within the structure. However, when fruit and vegetables are juiced or blended into a smoothie, the sugars are released. Once released, these sugars can damage teeth. Limit the amount of fruit juice and smoothies to a maximum of 150ml (a small glass) in total per day, and drink it with meals to reduce the risk of tooth decay.
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Weight gain and obesity
Sugary drinks are a significant contributor to weight gain and obesity, especially in children. Liquid calories from sugary beverages do not satisfy hunger in the same way as solid foods, tricking the body into consuming more calories than it needs. This makes it easier for people to add extra calories to their diet, potentially leading to weight gain.
Added sugars, which are sugars added to foods during preparation or before consumption, are particularly linked to weight gain. These include sugars in manufactured products like high-fructose corn syrup, honey, and sugar added to coffee or yoghurt. They are considered "empty calories" as they provide extra energy without any additional nutrients. On the other hand, natural sugars found in whole foods like fruits and vegetables come with vitamins, minerals, and fibre, which help slow down the absorption of sugar and can make you feel fuller sooner.
Excess sugar consumption can also lead to other health issues that may contribute to weight gain. For example, high sugar intake can cause tiredness, making it more challenging to stay active and maintain a healthy weight. Additionally, sugar can increase the risk of diabetes, heart disease, and high blood pressure, all of which can impact weight management.
It is important to note that weight gain is not solely due to sugar intake but is a result of consuming more calories than the body burns. Therefore, it is crucial to consider the overall diet and maintain a calorie deficit if weight loss is the goal. Additionally, when reducing sugar intake, it is essential to be mindful of replacing sugary foods with high-fat alternatives, as these may also contribute to weight gain due to their higher calorie content.
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Heart disease
Sugar can have detrimental effects on heart health, increasing the risk of heart disease and stroke. The impact of sugar on the heart is not entirely understood, but several connections have been observed. Firstly, excessive sugar consumption can overload the liver, which metabolizes sugar similarly to alcohol, converting it into fat. This accumulation of fat can lead to fatty liver disease, a contributing factor to diabetes, which, in turn, increases the risk of heart disease.
Secondly, a diet high in sugar contributes to weight gain and obesity. This is due to sugar tricking the body into turning off its appetite-control system, as liquid calories are not as satisfying as those from solid foods. Obesity is a risk factor for diabetes, high blood pressure, and high cholesterol, all of which are linked to an increased risk of heart disease.
Thirdly, sugar-rich diets have been associated with higher blood pressure, a significant risk factor for heart disease. High sugar intake can lead to insulin resistance, forcing the pancreas to produce more insulin, which increases the risk of type 2 diabetes. People with diabetes are more susceptible to heart disease, stroke, and other cardiovascular conditions.
Additionally, sugar can cause chronic inflammation in the heart and blood vessels, further boosting blood pressure and increasing the risk of heart disease. Sugar also affects cholesterol levels, increasing LDL ("bad") cholesterol and decreasing HDL ("good") cholesterol. This imbalance causes artery-clogging plaque, damaging blood vessels and the heart.
To improve heart health, it is essential to reduce sugar intake. Sugar-sweetened beverages, such as soft drinks and juices, are a significant source of added sugar. Even one can of soda can exceed the daily recommended limit. Nutrition labels can help monitor sugar intake, and it is advisable to choose products with low or no added sugar. Consuming whole, unprocessed foods and natural sugars from fruits and vegetables is preferable, as they provide essential nutrients and have not been linked to heart disease.
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Diabetes
Sugar is a form of carbohydrate that occurs naturally in many foods, such as fruits, vegetables, and dairy products. The body breaks down carbohydrates into glucose, which enters the bloodstream and acts as a source of energy. However, added sugars, which are sugars added to foods and drinks by manufacturers or at home, are particularly harmful to the body. These include sugars in baked goods, soft drinks, fruit juices, syrups, honey, and even some unexpected sources like soups, bread, cured meats, and ketchup.
Consuming too much added sugar can lead to weight gain, as liquid calories from sugary drinks do not satisfy appetite in the same way as solid foods. Excess weight increases the risk of developing type 2 diabetes, but it is not the only factor. Even without weight gain, a diet high in added sugar can lead to insulin resistance, a precursor to type 2 diabetes. Insulin is a hormone that moves glucose from the bloodstream into the body's cells, but continually high insulin levels can cause the body to become resistant to its effects. As a result, glucose remains in the bloodstream, causing high blood sugar levels that can lead to nerve damage and other metabolic abnormalities associated with type 2 diabetes.
While sugar does not directly cause type 2 diabetes, excessive consumption of added sugars is associated with an increased risk of developing the condition. Therefore, reducing added sugar intake and maintaining a healthy weight are important steps in diabetes prevention.
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Inflammation and other health problems
Inflammation is a natural healing response in the body to fight viruses and bacteria. Short-term inflammation typically lasts two to three days. However, diets rich in refined sugar are linked to chronic inflammation, a persistent condition that can lead to more serious health issues.
High sugar intake is associated with an increased risk of chronic inflammatory responses in the body. When sugar enters the bloodstream, it combines with protein or fat to produce harmful compounds linked to oxidative stress and inflammation. This process can also lead to insulin resistance and the storage of fat in the abdominal region, which is associated with inflammation in obese individuals.
Consuming excessive amounts of sugar can overload the liver, leading to a greater accumulation of fat and potentially resulting in fatty liver disease. This, in turn, raises the risk of diabetes and heart disease. Sugar also raises blood pressure, which is another pathway to heart disease.
In addition to heart disease and diabetes, sugar is linked to other health problems. For example, sugar increases the risk of tooth decay. Sucrose and fructose contribute to plaque formation, tooth decay, and cavities. Bacteria that cause cavities feed on sugar. Diets high in sugar allow this bacteria to grow and erode tooth enamel.
Sugar is also associated with weight gain. Liquid calories from sugary drinks do not satisfy appetite in the same way as calories from solid foods, making it easier for people to add more calories to their diet. This can lead to obesity, which is another risk factor for chronic inflammation.
Excess sugar consumption can also contribute to inflammatory bowel disease (IBD), a chronic inflammatory gastrointestinal condition. Studies suggest that a high-fat, high-sugar diet may trigger IBD, and the incidence of IBD is increasing in Western countries where these diets are common.
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Frequently asked questions
The reference intake for total sugars is 90g a day, which includes 30g of "free sugars".
Free sugars include sugars that are added to foods during the preparation process or before consumption, such as honey drizzled on yogurt.
Excess sugar consumption can cause many conditions, including diabetes, obesity, heart disease, high blood pressure, liver disease, and tooth decay.
Some ways to reduce sugar intake include drinking plain water, carbonated water, or unsweetened tea instead of sugar-sweetened beverages, swapping candy for a bowl of fruit, and choosing plain, unsweetened products like yogurt.
Experts warn against being overzealous in attempts to cut back on sugar, as this can backfire. People may find themselves reaching for refined starches, such as white bread and white rice, which can increase glucose levels and cause problems with heart health.
