High-fat diets may impair memory and raise Alzheimer's risk in days

New research highlights how high-fat diets may harm brain function and increase the risk of Alzheimer's disease. Studies on mice show that fatty foods can alter memory processing in just days. Government guidelines also advise keeping fat intake in check for better long-term health. A study by the University of North Carolina found that mice fed a high-fat diet showed changes in brain function within four days. Cells in the hippocampus, the brain's memory centre, became overly active, disrupting normal processing. This suggests even short-term exposure to fatty foods may affect memory and thinking.

Further research from the University of Rovira i Virgili linked long-term high-fat diets to Alzheimer's risk. Mice fed a 60 per cent fat diet for six months developed molecular changes tied to memory loss and cognitive decline. These findings add to concerns about how diet impacts brain health over time. Health experts recommend balancing fat intake for overall wellbeing. Government guidelines suggest total fat should make up no more than 35 per cent of daily energy intake. Saturated fats should be limited to 10 per cent, while trans fats should stay below 5g per day for both men and women. Not all fats are harmful, though. Unsaturated fats, such as monounsaturated and polyunsaturated types, are considered beneficial. Monounsaturated fats, found in olive oil, nuts, and avocados, support heart health and metabolism. Polyunsaturated fats, including omega-3 and omega-6, play a key role in brain function and reducing inflammation.

The research underscores the importance of moderating fat consumption to protect brain health. While some fats support bodily functions, excessive intake—especially of unhealthy fats—may lead to memory problems and disease. Following dietary guidelines could help reduce long-term risks linked to high-fat diets.