I'm trying to get an understanding of the portions that you guys are talking about. Am I correct that:

125g would be roughly .3 liters or 1.25 cups of a pasta like spaghetti (i.e. one that isn't hollow so it fills up most of the available space)

25g of cheese would be just enough to melt and form a thin layer over the top of the pasta

I think that I would want some meatballs or cubed chicken (or a vegetarian equivalent) to feel satisfied. However, I also probably wouldn't add the cheese so maybe it equals out somewhat.