If you're flying with a passenger/co-pilot I find it nice to be thoughtful - Having a curry the night before can prove hazardous to flight-deck relations, could lead to a breakdown in CRM and/or possible resultant legal action against the ruby shop that dispensed the offending meal for 'Failure to display clear warnings of dangers to flight crew if consumed less than 18 hours before flight'.
That being said, back in the days when I was enjoying my initial training for my PPL in San Diego, my instructor came out for the flight with a portion of fries and a carne asada burrito. The winds aloft were pretty strong on that flight.......
