Regardless of whether the noun is countable or not, it would typically still be “too much” when referring to how much you’ve eaten.
Consider the scenario where you’ve had only one steak (countable noun), but you had too much steak.
Of course, it’s not always like this. You might say that you had too many cookies for dessert.
More than 75 years actually.
I can’t find the article (I forget the name of the incident), but the Jewish genocide of Palestinians predates the nation of Israel by at least a few years.