Usually eating kelp in moderation does not cause low blood pressure in the elderly. Kelp is a common food. Usually the elderly and other healthy people eat kelp in moderation can replenish the nutrients needed by the body and also provide energy, but it will not cause low blood pressure, so there is no need to worry too much. It is worth noting that kelp, as a food, has no curative effect on diseases. In daily life, the elderly should pay attention to a balanced diet, avoiding the intake of spicy and stimulating food. They should quit smoking and drinking, and avoid drinking coffee, strong tea and carbonated beverages. For the elderly whose blood pressure fluctuates greatly, they should pay attention to monitoring their blood pressure. When the body is accompanied by dizziness, limb numbness and other symptoms of discomfort, should actively seek medical treatment to prevent accidents.