The impact of late-night eating on the digestive system depends on several factors: the amount and type of food consumed, eating frequency, the interval between eating and sleeping, and an individual's health status. According to Nguyen Thi Quynh, a specialist in the Department of Nutrition at Tam Anh General Hospital Hanoi, these effects are often more pronounced when someone consumes excessive fatty foods or alcoholic beverages within two to three hours before lying down to sleep.

Gastric reflux

The lower esophageal sphincter normally prevents food and stomach acid from flowing back into the esophagus. Eating late and then lying down reduces the helpful effect of gravity, promoting acid reflux into the esophagus. Common symptoms include heartburn, acid regurgitation, and a burning sensation behind the breastbone. Some individuals may also experience nocturnal coughing or hoarseness.

Bloating and indigestion

For some individuals, meals high in fat slow down the stomach's emptying process. Overeating, eating too quickly, or having a late-night meal rich in fats can cause bloating, a heavy feeling in the upper abdomen, nausea, and belching. This condition is often more apparent in people already suffering from gastric reflux or functional dyspepsia.

Protein-rich dishes like clams and fertilized duck eggs can cause indigestion. Photo: Thanh Ba

Risk of metabolic disorders

Regularly eating late can increase overall calorie intake, leading to excess energy, especially from items like fast food, sweets, sugary drinks, or fatty foods. Long-term fat accumulation negatively affects sugar and fat metabolism, increasing the risk of systemic inflammation, including in the gut.

Eating late and consuming overly large meals can also make it difficult to fall asleep, lead to restless sleep, frequent awakenings, or a feeling of fatigue upon waking.

To promote healthy digestion and better sleep, individuals should aim to eat dinner two to three hours before bedtime. Those who experience nocturnal reflux symptoms should maintain an interval of at least three hours. If a late-night meal is necessary, choose a moderate amount of easily digestible foods and avoid overeating. Limit fried and greasy foods, fast food, sweets, soft drinks, alcohol, and strong tea. After eating, a light walk is advisable; avoid lying down immediately, especially for those with gastric reflux.

If symptoms such as persistent upper abdominal pain, prolonged bloating, frequent heartburn (multiple times a week), difficulty swallowing, unexplained weight loss, vomiting blood, or black stools occur regularly, it is important to seek medical attention.

Thanh Ba