In USA, for some reason, servings in restaurants are awlays bigger than elsewhere.
Free market capitalism.
Really if you are making an omelet how much of the bill you charge the customer is comprised of the cost of the eggs? The answer is a sliver. It literally costs you pennies to toss in two more eggs. The customer gets a huge omelet and they declare your restaurant the best. The restaurant down the street sees this and and spends a few pennies and makes their omelet bigger. It's an arms race. The end result is a fat American populace that has no clue what true serving sizes are. The idea that free market capitalism solves all problems is childish preschool drivel.
I heard one estimate that McDonald's makes the best margins on french fries and cokes. In the US cokes are delivered as a relatively cheap syrup. The restaurant then mixes the syrup with carbonated water and sells the sludge at a ridiculous markup. They have such huge margins on that stuff they can afford to make the cups bigger and bigger. Again the American consumer is left with a totally out of whack notion of what is appropriate.