How much food should a middle-aged rabbit eat in a day?

Rabbits can be expected to live around 8 to 12 years, so they're "middle-aged" at the ages of 4 and 6 years. Rabbits of this age should eat a normal adult rabbit diet of mostly grass hay, some pellets and fresh greens daily, and limited treats. See the related question below for more info about the rabbit diet. See the related link below (House Rabbit Society) for info about age-specific diets for rabbits.