While festive occasions often revolve around rich and tempting foods, medical experts warn that repeated overeating can quietly damage not just the body but also the brain, leading to serious long-term health consequences.

Overeating during festivals and celebrations is common, with foods such as meat samosas, sausages and potato-based snacks often consumed in excess. While occasional indulgence may not cause immediate harm, experts say regular overeating can significantly affect health over time.

According to UK-based general practitioner and senior clinical advisor Dr. Donald Grant, overeating directly impacts brain function, reducing its performance and efficiency.

Dr. Grant cited a 2012 Harvard study which found that excessive calorie intake can lower brain performance. The study also linked overeating to a higher risk of developing dementia later in life.

He explained that excess calories can contribute to insulin resistance, a condition that disrupts the brain’s ability to function optimally.

Insulin resistance and long-term risks

Insulin resistance occurs when body cells fail to respond properly to insulin, a hormone responsible for regulating blood sugar levels. As a result, blood sugar remains elevated instead of staying within a healthy range.

Dr. Grant noted that even individuals without diabetes can develop insulin resistance. Over time, if the pancreas is unable to produce enough insulin to counter this resistance, it may lead to the onset of diabetes.

Effects on digestive and physical health

Overeating does not only affect the brain. Dr. Grant warned that consuming excessive food can trigger nausea, acidity, heartburn and persistent fatigue.

Excess calories can also disrupt digestion, often leading to bloating and discomfort. Prolonged overeating increases the likelihood of obesity and heart disease.

According to Dr. Grant, overeating negatively affects blood sugar and cholesterol levels. This imbalance raises the risk of high blood pressure and stroke, making the habit particularly dangerous in the long run.

Another major concern highlighted by Dr. Grant is the disruption of the intestinal microbiome. Overeating can disturb the balance of gut bacteria, leading to digestive disorders and diarrhea.

He added that such imbalance may also contribute to skin diseases, depression and anxiety, while weakening the immune system. Sleep quality can also suffer due to ongoing digestive issues.