I never want to be seen as minimizing a family's frustration by suggesting something will cure all their issues or completely fix a problem, so I'll start by saying that this suggestion may work for some, and not for others. However, this suggestion is a go-to for my families struggling with a child not wanting to sit in a highchair or a kid who loses it as soon as they are required to get into their chair at the table. Every once in a while...
You make a delicious looking meal, you sit down to eat it with your lovely baby, and splat! She throws half-or all- of it on the floor. This is a very frustrating but common issue (especially with 10-18 month olds).
There are really a few reasons babies/toddlers throw food:
1. They are just experimenting with gravity and cause/effect- "It's so fun to watch food fall and see what happens when it hit the floor."