Even unsweetened foods can contain large amounts of sugar. However, it is worth remembering that eating large amounts of sugar or sweets, along with excessive sugar consumption, can significantly affect the brain. Certain centers of the brain can also make a person dependent on these compounds.
One of the most common types of sugar is glucose. It is a simple carbohydrate that forms the basis of many complex compounds of this type, and can be found in many foods. Many substances from the foods we consume are converted in the body into glucose, which also serves as an energy source.
The impact of sugar consumption on intelligence
There has long been research in the scientific community on the effects of sugar on human health, even attempts have been made to categorize it as a drug. According to many studies, sugar consumption can lead to various health problems, including obesity, diabetes, cardiovascular disease, and digestive disorders.
One of the most serious consequences of sugar consumption is its negative effects on the brain. There are many studies that point to a link between consuming large amounts of sugar and negative effects on various brain functions, including intelligence. As far back as 2012, there were studies that found that high sugar consumption was associated with a decrease in the volume of the hippocampus, the part of the brain responsible for memory and cognitive functions. However, modern research is no less comforting.
Recent research demonstrates that sugar consumption can impair brain function by reducing the production of BDNF, a protein that is responsible for creating new brain cells and the connections between them. The relationship between sugar consumption and decreased BDNF levels is apparent after as little as two months of heavy sugar consumption.
High amounts of sugar and fat in the diet can damage the part of the brain responsible for producing BDNF, which ultimately leads to impaired memory and learning. BDNF levels are directly linked to the risk of Alzheimer’s disease, and higher BDNF levels are associated with a 33% lower risk of the disease.

Sugar consumption contributes to the development of Alzheimer’s disease
Alzheimer’s disease is often called “diabetes of the brain” because sugar greatly affects the brain’s abilities. This leads to physical and behavioral changes in the brain. In the brains of those affected, they observe the formation of deposits called beta-amyloid and tau proteins, which can block brain cells and lead to memory loss, cognitive impairment and loss of connections between cells.
Interestingly, excessive sugar consumption leads to the accumulation of beta-amyloid and tau proteins by disrupting glucose metabolism. Brain regions prone to accumulation of beta-amyloid and tau proteins in turn have high glucose levels. In animal studies, when blood glucose levels were doubled, beta-amyloid increased by 20%, and in Alzheimer’s patients, this increased by 40%.
Sugar addiction and its consequences
An equally dangerous aspect is sugar addiction. The brain perceives sugar as a source of satisfaction and reward. On a cellular level, this is due to the activation of dopamine pathways, the systems responsible for feelings of pleasure. Excessive sugar consumption can cause the brain to demand more and more sugar, exacerbating the problem.
Sugar addiction can manifest itself not only psychologically, but also biologically. Studies show that excessive sugar consumption can cause changes in the structure of the brain, especially in areas that are associated with decision-making and self-control, making the fight against addiction even more difficult.
How sugar consumption affects mood and behavior
It’s worth remembering that sugar affects mood and mental state. Short-term sugar consumption causes a short-term release of energy and improved mood, but then comes a sharp drop that can lead to irritability, depression and even anxiety. Prolonged sugar consumption can thus be a contributing factor to depression and anxiety disorders, impairing cognitive function and perception.

How to reduce sugar consumption and maintain brain health
To minimize the negative effects of sugar on the brain and maintain cognitive function, it’s important to adopt a few healthy habits. Here are some tips to help you control your sugar intake and maintain brain health:
- Plan your meals
Often we eat sugary foods because of habit or lack of time to cook. Try to plan your diet in advance and prepare healthy meals. Stock up on fresh vegetables, fruits, nuts and whole grain foods that are satiating and keep your energy levels up for a long time without causing blood sugar spikes.
- Limit your intake of sugary drinks
Carbonated drinks, juices with added sugar and energy drinks contain high amounts of hidden sugar. Replace them with water, green tea or herbal infusions. Such drinks not only do not contain unnecessary calories, but also contribute to improving your overall health.
- Read the composition of products, be careful
Many products that seem unsweetened may contain hidden sugars. For example, yogurts, sauces, ketchups, breads and even ready-made diet products can contain sugar in large quantities. When shopping, pay attention to the composition and try to choose products with minimal amounts of added sugar.
- Use natural sweeteners
If you crave sweets, favor natural sweeteners such as stevia, erythritol or honey. These sugar substitutes have a much lower glycemic index and don’t cause the same spikes in blood sugar levels.
- Replace snacks with healthy alternatives
Giving up sugary snacks like candy or cookies can be challenging, but replace them with healthier alternatives. Nuts, seeds, avocado or carrots with hummus are great snacks that are low in sugar but will provide the energy you need.

- Balanced eating patterns
Eat 3-5 times a day to keep blood sugar levels stable. This helps avoid drastic fluctuations in energy levels and appetite, which in turn reduces cravings for sweets.
- Incorporate physical activity into your daily life
Physical activity helps normalize metabolism, improve insulin sensitivity and maintain cognitive function. Regular moderate exercise can help lower blood sugar levels and improve brain health.
- Don’t forget your sleep
A good night’s sleep is critical for normal brain function. Lack of sleep can unbalance hormones, leading to an increased appetite and consequently more sugar intake. Try to get at least 7-8 hours of sleep per night to restore and maintain normal glucose levels in the body.
By implementing these simple tips into your daily life, you can reduce your sugar intake, support brain health and improve cognitive function.
Conclusion
In summary, excessive sugar intake can harm brain function, impair memory, and increase the risk of conditions like Alzheimer’s. However, by reducing sugar, eating balanced meals, staying active, and getting enough sleep, you can protect your brain health and support cognitive function. Adopting these habits will help maintain mental clarity and overall well-being.