Watermelon has the effect of quenching thirst and heat, as one of the common fruits, can be eaten with a variety of foods, and there is no food that can not be eaten together. But because of the cold nature of watermelon, and high sugar content, so in the diet must pay attention to the use of moderation, do not overdo it. 1, watermelon is a common summer fruit, plus the size of the watermelon is generally larger, so it is easy to eat all at once. Summer temperature food is prone to deterioration, not timely put into the refrigerator or stored for too long do not eat, otherwise it is easy to cause diarrhea, vomiting and other symptoms; 2, the elderly, children and other people with weak spleen and stomach function, should not eat too much watermelon, especially can not eat chilled watermelon, after eating may stimulate the gastric mucosa, resulting in loss of appetite, vomiting, abdominal pain and other discomfort; 3, diabetic patients Can not eat too much watermelon, because of the high sugar content of watermelon, no restraint in consumption may lead to increased blood sugar, or even aggravate the condition and other adverse events; 4, watermelon in the water is high, and contains more minerals, and kidney dysfunction of the population due to poor kidney regulation. After consumption can lead to a large amount of water retention in the body, increasing the burden on the kidneys, so people with chronic kidney disease and other kidney function problems are best not to eat too much watermelon.