Can oranges and watermelons be eaten together?
Generally speaking, oranges and watermelons can be consumed together, but in moderation. Detailed analysis is as follows:

Oranges contain abundant vitamin C, dietary fiber, potassium, calcium, and other nutrients, which help enhance the immune system, promote iron absorption, provide antioxidant effects, and assist in collagen synthesis. Watermelons are rich in water, vitamin C, potassium, carotenoids, lycopene, and other nutrients. They have effects of clearing heat, relieving summer heat, stimulating saliva production to relieve thirst, reducing swelling and promoting urination, as well as beautifying the skin and improving appearance. Additionally, they help maintain the normal functions of the heart, nerves, and muscles.
Both oranges and watermelons are rich in dietary fiber, which helps promote intestinal motility, improve constipation, and assist the body in eliminating toxins and waste. Both fruits also contain significant amounts of antioxidants, such as vitamin C and carotenoids. These substances can remove free radicals from the body, reduce cellular damage, and thus enhance the body's immunity.
However, it is important to consume them in moderation to avoid adverse effects on blood sugar control and overall health caused by excessive sugar intake. It is recommended to maintain dietary diversity and balance in daily meals, avoiding excessive intake of any single food or nutrient.