There are rarely any leftovers in this household, just like when I was a child at my parents' house.
I'm sorry, but regularly leaving food for someone else to eat or get thrown away is not acceptable in this household at all, and I say that with the strongest of disapproving tones.
I'm happy to try and accommodate people's palettes, and I know I'm relatively lucky compared to some parents, as ours will eat 70 - 80% of what DH and I like, but I do not entertain the idea that they should leave food as the norm, for three reasons... primarily, the cost of food... but also from an evironmental point of view (animals died to serve that meat on the table, gas was used to cook it) and from a respect point of view (I've better things to be doing than making food that's not going to get eaten).
If you regularly have leftovers, I'd look at:
1. Are they genuinely unable to finish off the food?
For example:
- What time are you feeding them, and can it be optimised?
- Are they snacking on things beforehand?
- How big a portion are you serving, and is it age-appropriate?
- How do you serve? Do you plate everyone's food up or let them serve themselves? If the latter, are their eyes bigger than their bellies?
2. If there's no reason for them to be able to not finish their food...
- Are they not eating it because they are just being fussy eaters? A few lessons on table manners, such as being sent to bed with the option of dinner or nothing will suffice - and it's a good opportunity to teach them about food waste, for example.
- However, if they honestly, genuinely don't like what you're eating, you need to accommodate them more. For example, I cannot abide peas - never have, never will. I'll eat most vegetables apart from them. My oldest is the same with leafy veg (can't stand spinach or cabbage), so when that gets made for the rest of us, I just make sure his plate doesn't have any on, and he gets extra of another veg instead. I'm certainly not going to force him to eat something he genuinely doesn't enjoy.
In closing, I'm actually genuinely shocked at the relaxed attitude a lot of people have towards food wastage - when I've been to dinner with friends or on play dates with our DCs to their friends, and food has been served, I'm often surprised at the food portions being given, or the timing it's being given out at.
Case in point - last week I went to visit my sister in law with our 3. When we were there, she served a lovely lunch, but plated everything up for us (cold meats lunch) - the children's portions were about 80% of the portions she gave for the two of us - there's no way my 8 year old could finish that... so I didn't have a problem with him leaving any. I apologised and next time I'll make sure I (politely) reduce the portions in future when we're over... I just cannot abide seeing things thrown in the bin like that if I can help it.