Can onions and lettuce be eaten together?

Generally speaking, onions and lettuce can be eaten together, with only moderate consumption needed. The detailed analysis is as follows:

Onions contain components such as prostaglandin A and sulfides, which can promote blood circulation and reduce blood viscosity. Meanwhile, the alliinase contained in onions can stimulate appetite and aid digestion. Lettuce, on the other hand, is rich in dietary fiber, vitamin C, potassium, and lactucin, which not only promote intestinal motility and prevent constipation, but also help regulate electrolyte balance and provide diuretic and anti-edema effects. When consumed together, they complement each other nutritionally: the antioxidant components in onions work synergistically with the vitamins in lettuce to help enhance immunity and delay aging; the combined supply of dietary fiber more effectively improves the intestinal environment and prevents indigestion. Additionally, both foods are low in calories and high in water content, making them suitable for individuals pursuing light meals or weight management.

However, due to the pungency of onions and the cool nature of lettuce, those with weak gastrointestinal function should control their intake to avoid excessive consumption that may lead to gastrointestinal discomfort. Moreover, since both are vegetables high in water-soluble vitamins, it is recommended to cook them using methods such as quick stir-frying or cold mixing to minimize nutrient loss caused by prolonged high-temperature cooking.