The BRAT diet, consisting of bananas, rice, applesauce, and toast, is recommended for individuals suffering from gastrointestinal issues like nausea and diarrhea, aiming to provide an easily digestible and low-fiber meal. It is advised to follow this diet for a short period, generally 1 to 3 days, as it lacks essential nutrients and should only be implemented under doctor's guidance. While effective in alleviating symptoms and promoting recovery, it is not suitable for long-term use or for children who require more balanced nutrition.