Source article: https://www.news-medical.net/news/20250306/High-fat-diet-could-cause-memory-problems-in-older-adults-after-just-a-few-days.aspx

Research using rats suggests that a short-term high-fat diet can negatively impact memory and cause brain inflammation in older adults. This occurred rapidly, within just three days, prior to the onset of obesity or significant metabolic changes. While both young and old rats experienced metabolic issues and weight gain after a longer exposure to the diet, only older rats showed memory impairment and brain inflammation even after the brief dietary change. The study indicates that aging brains may be more susceptible to the inflammatory effects of unhealthy diets, independent of obesity, highlighting the direct and swift impact of diet on cognitive function in older individuals.