Yes, 3 cups of rice a day is too much for one person.
If 3 cups of rice is cooked rice then it will be too much for a person to consume in one day.
The intake of cooked rice a day include the following;
¼ cup of cooked rice a day intake is suitable for children below 7 years old. children below 7 years old are recommended to eat ¼ cup of cooked rice a day. It is healthy for children between 4 to 6 years old to eat ¼ cup of cooked rice a day.
½ cup of cooked rice a day intake is suitable for children above 7 years. Children above 7 years can eat ½ cup of cooked rice a day.
In addition, adults also qualify to eat ½ cup of cooked rice a day .