This is actually a reason why UK males are the 12th most overweight in Europe (Greece is first) but UK females are the most overweight in Europe. Almost anywhere I go, women eat the same amount as men. They need to understand they just can't do this.
In lots of European countries, women eat far smaller portions, in line with their caloric needs.
Although that is far to few calories, if you're used to it and have been severely restricting for a while it get's easier and you learn how to spread it out and what foods have the least calories.