Over-eating
Food, no matter how healthy, if consumed in enormous amounts, may induce feelings of nausea. Stuffing yourself with too much food may affect your digestive system and leave you feeling bloated, leading to abdominal discomfort. Sugary and greasy foods are more likely to irritate [10] the stomach if consumed in large amounts. There is a high chance of over-eating to cause nausea and vomiting in persons with gastrointestinal problems like peptic ulcer, GERD, and Irritable Bowel Syndrome.
Feelings of Nausea after eating may also be an allergic reaction to some types of foods. For example, lactose-intolerant people experience feelings of nausea after eating dairy foods like milk or cheese.