2. Oranges have high sugar content. Eating a lot will instantly increase the viscosity of blood, and the heart needs to accelerate the pulse to drive blood circulation. The heartbeat is accelerated, and people's irritability is aggravated, which is similar to what Chinese medicine says. Moreover, eating foods such as fruits with high sugar content will create an environment suitable for the reproduction of oral bacteria, which will lead to the so-called characteristics of getting angry.