I don't think it's necessary to represent the different types of food sources. Quite the opposite, one food item in the icon is enough. People understand it perfectly well and it makes the icon much easier to read at small sizes, which is far more important than representing all the different possible food sources in a 16x16 px space.; there's no need to overcomplicate things.    Your lifestyle choices and the way you choose to raise your children are entirely respectable. However, I don't think appealing to veganism is a sufficient argument to justify this change. It's difficult to determine where to draw the line when deciding aspects of the game based on specific ideologies. Not long ago, a user suggested that Mauryan maidens should be covered up because, based on his own moral beliefs, this was wrong. And there are many similar cases. That's why I mentioned the historical aspect as a more consistent basis for arguing in favor of this change.

I will try that

I just hope when expecting and raising them you'll get them their nutrients.

It certainly did, it's hard to get a significant surplus just with husbandry, that happened when in synergy with agriculture (crops to feed animals, their manure to fertilise crops). That's why I think Field and Corral dynamics could be less dull.   So is food for food, but if one is going to represent that icon with many types, not doing so for the others might look inconsistent as a design choice. Of course wood still refers to wood, stone to stone, and metal to metal, just that there are (currently) many sources of each.   What do you even mean by that you "couldn't possibly explain why the food icon is of flesh if killing animals for their flesh is bad"? Are you going to tell your kids all ancients were vegetarians or vegans? It's not the game that is unreasonable!

I plan to teach my future kids it’s bad to kill whether human or animal. I would like to play all major free culture video games with them. But while farming and building a wonder I couldn’t possibly explain why the food icon is of flesh if killing animals for their flesh is bad. The game does not offer a reasonable choice .   People still eat meat for a variety of reasons but I hope we can all agree that teaching our children to avoid meat if possible is for a better future !