Friend who does Keto....

A friend has followed a Keto diet for about 3 years now and lost over 2.5 stone on it very quickly, has come to a plateau now, but still follows it strictly as is sooo used to what she eats....she looks amazing and has achieved what she wanted, but still follows it...

I definitely do no not have the willpower to follow such a strict diet, as lots of food is not allowed (even though I dont eat lots if rubbush food) and all she ever seems to be doing is food shopping...