Consuming unhealthy foods can negatively affect the brain, impair memory, and increase the risk of cognitive decline. Therefore, to maintain sharp memory, it is important to limit the following types of foods:

1. Sugary drinks
Beverages like soft drinks, packaged fruit juices, and energy drinks that contain high amounts of sugar can increase the risk of Alzheimer’s disease and dementia. They also contribute to obesity and high blood pressure.
Alternatives: water, unsweetened tea, vegetable juices, unsweetened dairy products.

2. Excessive alcohol consumption
Drinking alcohol and other alcoholic beverages can harm the brain. Stimulants and addictive substances in alcohol, when accumulated over time, can inhibit or paralyze the activity of nerve cells. Heavy alcohol use has been linked to smaller brain volume and poorer memory.

3. Foods high in cholesterol
Studies have shown that a diet high in fats and cholesterol is closely linked to damage in the central nervous system. Consuming too much bad cholesterol (LDL) can lead to plaque buildup in arteries, including those supplying the brain, reducing blood and oxygen flow, damaging neurons, and impairing memory and thinking. People with high LDL and low HDL (good cholesterol) are at higher risk of Alzheimer’s disease. Good cholesterol helps protect the brain through its anti-inflammatory and antioxidant properties.

4. Refined carbohydrates
Refined carbs, such as white sugar and processed grains, have a high glycemic index (GI), causing blood sugar spikes after eating. Diets rich in sugar and refined fats are linked to poorer memory, possibly due to inflammation in the hippocampus—a brain region involved in memory and emotion.
Alternatives: nutrient-rich carbs like vegetables, fruits, legumes, and whole grains.

5. Foods high in salt and unsafe foods
High-salt and high-protein foods, such as smoked meats, increase water loss from the body, which can reduce cognitive function. Additionally, unsafe foods with pesticide residues, growth stimulants, or harmful chemicals not only increase cancer risk but also contribute to serious memory decline.