i am sure that airlines could do a better job of ensuring less food waste - how difficult would it be to ask all passengers to order their meal. those who never eat plane food wouldnt order but would have to know that they won't get offered anything. Those at the back of the plane get what they want and not what is left.
buffet - i always take a small amount and go up regularly - the sight of a full plate puts me off eating. i also like to start with a starter and work my way towards a dessert. Sweet and sour has a place and savoury rice and cake is just not it